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-   -   Eagle 2 ARF & 4 Stroke Engine? (https://www.rcuniverse.com/forum/kit-building-121/1129587-eagle-2-arf-4-stroke-engine.html)

elad 10-02-2003 09:14 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
I looked up the site and saw the Screamer "propoganda."

I thought it was just hype. Maybe I was wrong. What do you think makes the .48 a real screamer Bill?

elad

elad 10-02-2003 09:24 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Don,

I've seen snow like that down here maybe 3 times in 50 years. I hope that average is the norm.

elad

elad 10-02-2003 09:29 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Tom,

If we get a 2 inch snow here the whole country shuts down for 2 weeks, except for the ggrocery stores.

elad

TomCrump 10-02-2003 10:04 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Elad, if we get two inches of snow, we figure that's about average, for a day! Most of our snow seems to fall in Jan. and Feb. When it finally lets up and the sun shines, we get the flying bug real bad. Wish we could have your and Bill's winters, but I'll keep our summers. The reason everything closes down during snow in the South is that it doesn't happen often and the road commisions can't prepare for something that might happen once in a blue moon. Up here they know it's coming. Usually I'll see plows out at 5:30 AM when I'm on my way to work. Unless it's real bad out, the roads are in good shape (passable) by the time I get off work. Good thing, cause then I can get home and work in my planes1

William Robison 10-02-2003 10:19 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
In Northern Kentucky, where I wasbeforeVirginia. it wasn't uncommon for the ground to turn white in mid-November, we'd not see dirt again until the following April. Bah.

K&B "Screaming 48?" just check the reviews. Normal airplane version is rated for peak power at 15K rpm, other versions over 25K rpm with a pipe.

The type 4800 is rated 2.0 hp at 15k, the 4825 DF engine goes up to 3 hp.
Even subtracting hype it has to be a really strong engine. The 8702 at 2.1 hp, 7510 at 2.5 hp, and the 8703 at 2.7 hp. And then the 7525 - 3.2 hp at 25K rpm.

Power or not, running at 25K rpm it's going to be screaming.

Bill.

elad 10-03-2003 05:29 AM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Tom,

You're exactly right about the road comissions etc. Down here very few people own a set of tire chains (mostly hunters.) When I was up there, I would imagine, few people need them because the roads I saw were clearred of snow & ice. My imagination though is based on a 2 week stay, in town, working mostly, and eating out. Hardly a vacation and having time to be getting to know the country.

What impressed me most, about vehicles, when I was there, was the number of people who drove 4 wheel drive pick-ups with snow plows on the front.

I can understand why a 2 inch snow is normal for a day. The 'Lake Effect' snow caused by the moisture freeezing is a big reason for that.

elad

elad 10-03-2003 07:31 AM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Bill,

Here in north LA the ground might freeze a few times per yr. Then only 1/2 inch to 1 inch deep.

Now, I remember the "48" HP was rated at (realatively) low rpm compared to other engines. I wonder if they do that with tuned exhaust.

Yep 25K is a screaming speed. It's amazing to me how the engines stay together.

elad

TomCrump 10-03-2003 03:20 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Elad, they do a good job of keeping the roads cleared up here. My problem is that sometimes I leave for work before they are out. On another note. Are you going flying this weekend? The snow has turned to rain, here, but the forcast for the weekend doesn't look good. More time to build, I guess.

elad 10-03-2003 06:38 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Tom,

I went to the airport and just got back home. I forgot to confirm with Ron that I would make it and I was the only one who showed up. The weather was beautiful today, just a very slight breeze, sunny and shirt sleeve temperature.

I just sat there with the rubber-bandless wing sitting on top of the fuse, going through the motions with the radio and trying out the dual rates. I tried to get the flap feature to work, but nothing I tried caused the ailerons to work as flaps. Maybe there's something else that has to be done (wired) internally to the plane or the radio for that function to work.

Sorry your weather is such a bummer. Maybe you'll get a head start on the building project.

elad

don olsen 10-03-2003 07:38 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
sounds like quality time with your plane .i have done the very same thing myself. just dont give in to the urge to fly alone or without your "wings". there is nothing but disappointment there. sunny skies, warm breeze, sounds good to me
don

TomCrump 10-03-2003 08:30 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Elad, I went Down to Don's tonite. Rain stopped but so dis the daylight. We talked about my current FW190 project and about the Ziroli Stuka that he is going to build for me. So the evening was well spent. We're planning on flying on Sunday if the weather permits. Too bad you didn't connect with your instructor, but it sounds like you spent the time well. Don't forget to charge your batteries for tomorrow's session! Hope all goes well.

elad 10-04-2003 08:47 AM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Tom, Don,

Sounds like you have a good handle on the building season. Good luck with the projects. They sound like they will be nice planes. Hopefully the wx will get better enough times this Winter to fein off cabin fever.

I didn't forget, after the dry run, to confirm Saturday's (today's) training sesson.

I can't fly alone. I don't have fuel, a glo heater, a starter etc. AND I don't have the urge to try flying alone because I've been rescued enough times to realize I would end up with iddy biddy pieces of a plane, so flying alone doesn't sound like a plan just yet.

Naturallly, I do wish I had my wings already. Oh yes, the batteries should be about ready to burst. They have been on charge for a week, so the short session didn't discharge them much, but I reconnected the charger anyway.

I recently got enough tin to make a barn. I'll have to count up the pieces and figure how big I can make it then get the 2x4s etc. to build it. I'll insulate a room big enough to hide out in for indoor projects and an occasional escape from the fray.

Now that cooler wx is here I'll feel more like gegtting the thing under way.

elad

TomCrump 10-04-2003 11:04 AM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Elad, sounds like you have your building project! As far as battery charging goes, sounds like you need a trickle charger. That way your batteries will be ready to go without overcharging them. I think ACE has one called "Add a Trickle". You just solder it on to the wires of you Futaba's charger. You charge your batteries and the flip the TX and RX switches to trickle. That keeps 'em up and ready to go. I think they cost around $20.00. Only take a few minutes to do the soldering. By the way, hail and rain, today, 42 degrees.

elad 10-04-2003 03:48 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Tom,

Ron said that the charger automatically goes into trickle mode after it fully charges the batteries. I didn't know those add on trickle chargers were available. That's very good information to have.

Again, today, sunshine, very light breeze and warm, at about 74 degrees.

It's about time to hit the shower and change into flying colors. ha

elad

TomCrump 10-04-2003 06:44 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Elad, Good to here that you already have a decent charger. Just wanted to be sure that you didn't overcharge your batteries. It's also good to know that you have good flying weather. More hail, today. Worked 5 hours, then came home and watched Iowa beat Michigan in football. Wasn't disappointed, tho, I grew up in Iowa and follow Iowa athletics with a passion. Tonite I'll go to the store and pickup some materials to glass my 190. Tomorrow-BUILDING TIME!!

elad 10-05-2003 05:18 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Tom,

I'm always eager to hear a good tip like the add-on trickle charger you told me about. I hope I can remember that if I need it later.

I tried to connect here yesterday evening to let you all know how the day's lesson went, but the site was closed for upgrades or something.

My take-off pattern is no longer looking like a snake trail. There were no other fliers on the field yseterday so we walked out to the center of the runway for my take-offs. That helped me keep the line straighter and I think that if I gradually move further back toward the edge of the strip I can eventually keep it straight.

When I went to fly yesterday I almost knew I'd have to try the landing portion of the training. There's 2 things different about the plane now from what I was accustom to. One is that both ailerons are connected now and the other is that the radio couldn't be set to the low side of the dual rate feature. I had gotten sort of use to controlliong the plane with those differences,,, then...

Sure enough, Ron had me try his usual landing scheme of cutting power and gliding in toward the landing strip. I just couldn't get positioned properly over the strip after cutting power. I tried that several times without success. While doing that Ron had to save my bacon more than just a few times to keep me from crashing.

After remembering what Ron said, when we first started training, about telling him if I wanted to try something different, I thought it would be worth a try to fly around real slow for a while to get the feel of the controls at the slower pace. That's because it was very tough for me to make the transition from controlling the plane at its normal flying speed to controlling it at the idle speed for landing.

Anyway, Ron said it was OK to try that. So, after doing the slow thing for a while and gradually working my way closer to the runway I finally got close enough that he told me to cut power and to land.

I put it down with a pretty good bounce, and I let it go off the side of the runway after rolling on its wheels for a short time, but the plane stayed right side up the whole time and nothing was broken. I think the prop hit the runway, but it was still intact.

It wasn't exactly a professional looking landing but I think it was one that real people could have walked away from if they had been in the plane with their seat belts fastened real tight. I guess I can smile about that.

Ron was elated because I had made the take-off, the flight and the landing without him taking control with the buddy box. He said I was his first student to do all that with just 3 lessons. I was just relieved the plane was on the ground, right side up and still in one piece, but mainly that the landing was over with. ha

I think that Ron was shooting for me to make a landing during that particular training sesson for some reason because we stayed on the field quite a bit later than he usually likes to clean up the planes and go home.

It was getting closer to dark than on any other day we had flown and I wasn't sure I was up to another landing, so I suggested we have a Sprite. We used that drink as a celebration and time to reflect on the day's events. Besides, making another successful landing may have taken until midnight. ha Ron likes to end a training sesson on a good note. I have come to believe that is a very good idea!

The next training session will consist of take-offs and landings. I'm pretty sure he'll get some dead stick landing attempts in there too. I have the feeling I better try cutting the power while way up high and practicing slow speed approcahes and control.

I know I still have a lot to learn before Ron disconnests the buddy cord, but he told me he's not putting me on my own just yet. I let him know that was very reassuring to me.

I'm happy to see I'm making progress and I'm starting to look forward to each training session more than I did the previous one.

elad

don olsen 10-05-2003 05:45 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
sounds like your on your way (there is a song like that?)
don

TomCrump 10-05-2003 06:31 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Elad, CONGRATULATIONS!!! Takeoff and landing after only three lessons. After three lessons for me, I don't think I could see the ground and the airplane at the same time. I was still flying way up high. Sounds like yoy are doing real well. I didn't get to fly today. It was 34 degrees this morning. Don and I decided to let it warm up a bit. Then it rained a little. After that the sun came out--and got windy. It's supposed to be nicer later this week. If we hurry to the field after work one night, we can each get in a couple of flights before it gets too dark. I did get some building done. Glassed the fin on the FW. I used a waterbased product instead of epoxy finishing resin. Seems to be working well. So, I got my building time in.

William Robison 10-05-2003 06:32 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Don:

Porgy's last song, from "Porgy and Bess;" "I'm on my Way." George Gershwin's Magnum Opus.

Bill.

William Robison 10-05-2003 06:49 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Dale:

And congrats from me also.

Bill.

elad 10-05-2003 08:19 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Tom, Don, BIll,

Thanks for the congrats.

And Tom, it's funny that just yesdterday I commented to Ron about the difference in my field of vision when he's flying and when I am. So, I have to admit to suffering from the same tunnel vision syndrome.

elad

don olsen 10-05-2003 09:07 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
elad
that tunnel vision is the reason that most fly-ins that you will fly at will ask you to have a spotter or will provide one so you know what the traffic is doing. also flying at different feilds have "different air"- obstacales -runways- etc. it is nice to have a buddy to go with. Tom and I have gone to many and are used to each others flying styles. also I go to other shows with another guy in our club. it is good to travel to other places to see what improvements you can make to your own flying style -safety items for your self and your field. The the friends and comrades you meet in this hobby/sport are like no others I have run into. happy flying
don

TomCrump 10-06-2003 05:09 AM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Elad, If you haven't already, go to a flyin in your area, as a spectator. You might be amazed at what you'll. You get used to what you see at your field (procedures, flying styles, planes). Things could be quite a bit different at a flyin. Watch how the pilots do things. Look closely at the models. You'll see a whole range of of ways to do things. To me, it's a good way to learn new techniques. Take your camera. Pilots bring their coolest stuff to airshows.

TomCrump 10-06-2003 07:57 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Elad, No wind, blue skies, temp in the 50's. Don and I each got two flights in. Flew so long the second time, I ran my Sportster out of fuel in the air and had to deadstick it down. We both had a good time.

Sincraft 10-06-2003 08:58 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Grrr, how do you unsubscribe from some threads and subscribe to others!? I check my email for new replies etc and only get the same old threads that I didnt start. I confused. Anyway, I'm back again to this thread. I lost it and realized it was in kit building when I was looking for tips on building surfaces.

ANYWAY, sounds like you are on your way to becoming an expert pilot soon Elad. :) Good.
I think I am going flying tomorrow after work for an hour while there is still good light to be had. Supposed to be blue skies and 65 yay. We hit freezing a couple times already and it feels like we went right from summer to winter for a bit there. Living where you do elad, sounds like you will have many many months of flying ahead of you...if not non stop. You suck. hehe.
I am actually starting on the kit tonight a bit for a couple hours. I am not liking how I have my build setup though. I built an table (used to be a workbench but I put so much into it I call it a table now, and it kinda looks like one heh) But the problem is it is in a wierd spot in my house. Too cold upstairs and in the basement to build comfortably, and running an electric heater is too costly just to build a model. Upstairs is fine for sleeping but downstairs is where it's nice. Old house. So I put the workbench in my living room lol.

Anyway, hope everything goes good for you and your flying. Hopefully tomorrow will be uneventfull for me.

EDIT: Hey check out this thread. Don't know if you guys saw this crash video of that yellow jet. It was a short one. Someone got ahold of the video and extended it and added some nice features. It's the greatest crash video yet :) 22 mb though fyi. http://www.rcuniverse.com/forum/Kang...1177073/tm.htm

S

Sincraft 10-06-2003 10:48 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Hey guys check out my new thread if ya will..thanks

(hopefully when I run into trouble this place will help out hehe)

http://www.rcuniverse.com/forum/Char...1185367/tm.htm

elad 10-06-2003 11:00 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Tm & Don,

I'm glad you finally got to fly again. I've heard some pilots say they'd rather build than fly. Not me, not you. Well, I'm guessing not me. Maybe I'll try building a kit after I learn to fly.

In my town we have a festival every year called the Lumberjack Festival. Lots of organizations put on fun things for the community to do. The flying club had planned to sponsor a fly in, but canceled it because the membership has dwindled. I planned to help the club, but it turned out its my weekend to work. There's a few clubs within a 60 mile drive from me, so I'll probably get to attend a fly in nearby. It sounds like a lot of fun.

I had a digital camera that broke, so I'll have to get more serious about shopping for another one. I probably should get something bigger & better. The other one would take about 15 shots. There's so many options available it seems like too many choices. I guess that's supposed to be a good thing.

elad

elad 10-06-2003 11:42 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Sincraft,

Un-subscribe? I don't recommend trying that. Every time I ever tried to un-subscribe from something I got 2 to 3 times more of what I already didn't want. ha Well, maybe this is different. When I get e-mail notification that there's a new message there's a place down at the bottom of the notice where you can click on it to do that.

Ooohhh, so you think my almost close to semi-tropical climate sux huh? Well, I just looked outside tonight and the Moon is very bright. You could count the blades of grass at 10 paces. I'll bet that out at the airport you could see the plane at a couple of hundred yards. So, not only can we fly here nearly year round we could fly under a bright Moon too. ha!

Good luck on the new project. Sounds like you're getting a good start on the kit. In the living room, hhuuummm. Have you ever heard of a guy nammed Jeff Foxworthy? ha I do nearly all my hobbies in my living room. I drove my wife NUTS while learning morse code on the Ham radio. I broke her eardrums and she broke dishes (over my head.) If you're lucky your wife will only break your head instead of the new plane.

If you knew what you were doing we'd still need you around to tell us what we're doing.

elad

TomCrump 10-07-2003 04:33 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Sincraft, Years ago, when I got into this hobby, I lived in a mobile home with my wife and three young daughters. I udes the kitchen tablr for my bench. Did that for five or six years. I even built three giant scale airplane in that kitchen. We had to eat in the livingroom, which also contained five or so finished models. Airplanes everywhere! I have a GREAT wife!!! Now that we live in a house, and the kids are gone, she put her foot down. NO AIRPLANES in the house. Works fine now. She let me outfit the garage with a furnace, TV and stereo. Works for me. Enjoy yor building experience.

TomCrump 10-07-2003 04:44 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Elad, We had the same big moon last night. Don and I commented on it while we were flying. When the sun started setting, the temp dropped, so we didn't hang around to enjoy the moon. Sincraft"s workbench looks nice. Hope he's single or has an understanding mate.

Sincraft 10-07-2003 07:48 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 

If you knew what you were doing we'd still need you around to tell us what we're doing.
lol yea :)

Tom I cant believe you managed to keep all that stuff in a trailer. Was it at least a double trailer? I lived in one for about a month when my g/f and I moved from one place to another, and it was hell. All we had was a dog to contend with hehe. My computers took up alot of space however. Well hopefully my workbench will be able to stay there for the duration, I finally like the positioning. I MAY move it upstairs into a vacant 'guest' bedroom that is empty other than boxes that I have special things in I don't want damp in the basement. At least until I build shelves down there. Winter is ok, but summer I took a hit from humidity. The upstairs is COLD during the winter. Barely sleepable during the really really cold nights. I am going to weatherproof the windows a bit more and have a ceiling fan pulling the heat from downstairs up so hopefully it will be better. THEN I may move it upstairs into that room. (OOOld house)

Welp, thanks for the comments and now it is time to get to work. :)

EDIT: Hey btw, did you guys noticed that these forums have seriously DIED? Colder weather coming I am sure people are dropping off as I probably will for awhile. I lose interest in things rather quickly (I blame it all on my rants HA), but I have been in this for a bit ...I enjoy building. However, even so, there is still much time to fly and bs about this stuff for most of the USA and many other countries. I was here for about 2 weeks before they made a website change. Threw me for a bit of a curve but ever since then seems like noone is here anymore? Am I crazy or have you guys noticed this also?

S

S

TomCrump 10-07-2003 08:52 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
I figured things slowed down cause people were out flying. Thought they might pick up when it gets colder and they are inside.

elad 10-07-2003 10:29 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Sincraft,

I checked out the link and the pictures. You have a nice looking work station. Having it down in the living room sounds like the best soultion. It would be quite an undertaking to add insualtion to an old dwelling.

I haven't noticed activity on the other threads because I've only had time to tend to this one. Dad is home from the hospital and is doing better, but needs a lot of attention while recuperating. Mom kept him taking medicine on schedule, but she died about 3 years ago. He gets confused even with a highly detailed, large bold font printout.

Good luck with the plane,

elad

elad 10-07-2003 11:39 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Bill, Tom, Don, S.,

I read somewhere about a fellow wanting to design his own plane. From the responses he got I gather that designing and building from scratch is awfully complicated.

I mentioned before about looking at the plans on the SPAD (simple plastic airplane designs) web site. I want to try building one like one of those (I haven't decided which one yet, maybe a mid wing) but am wondering if there is some simple way to enlarge the plans that would work successfully on the first try. Do you think it would work to just use a calculator to multiply measurements of a given set of plans by a factor of 1 1/2 or 2 to get the desied size difference? Or is this simple thinking just too simple minded?

Also, is there a generalized set of mathematical proportions that can be used as a guide in designing a plane. For instance: 1) wingspan to wing cord, 2) wing surface area to tail control surface area, 3) distance from wing to tail section etc?

Maybe this is asking for too much. I would guess that it would all get complicated by things like whether the wing is flat on the bottom, semi-symetrical or symetrical. And by things like the location of the wing in relation to the fuse, ie. top wing, mid wing, low wing.

I have looked a little bit for sites on designing, but what I found was the two extremes of, either a folded paper airplane, or an introduction to what looked like a college course in engineering. ha

I don't mind using math formulas. I used them a lot when studying for those HAM radio licenses I got and enjoyed doing that. I even built a few transmitters and receivers (not from scratch) by using formulas and electronics schematics. I just don't want to start taking a course in aerodynamics at this late stage in life.

Someone said, (it might have been you, Bill) "If it looks like it will fly, it probably will." Is it almost that simple?

elad


Sure, I'm old enough to know better. But I'm still young enough that occasionally I get to make the choice. ----- elad -----

William Robison 10-08-2003 01:38 AM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Elad:


"If it looks like it will fly, it probably will." Is it almost that simple?
Just about.

If you find a good design that's smaller than you want, almost without exception it will still fly well when made larger. The reverse is not true. Save the smaller versions for later when you have more experience.

If you are scaling a wooden plane up to 2x don't double the wood sizes, go to 1.25x or in some places 1.5x, but on the skins you might well stay with the same thickness. This is where you can run into trouble with your first few scratches, not knowing how to make it strong without making it heavy at the same time.

When we enlarged the Duellist 2/40 and kitted the Duellist 2/60 we went from a little over five feet span to more than seven feet with almost no increase in weight.

Enlarging a SPAD is just as easy, and a lot cheaper. You might need an additional yardstick spar, just look at others in the size range you want. There are several sizes of the "QUHOR" to choose from, for example.

Usually I discourage a first time scratch builder, but the wannabe scratch builder often starts by asking what glue, what wood, how big, it becomes obvious he has not had the experience needed. But if you start with an existing design and scale it you might consider it to be a scratch, but it's more a plan build, and you have the guide to lead you.

Would advise a couple of kits to get the idea of material sizes, so forth, before attempting to scale one, though.

Bill.



elad 10-08-2003 08:07 AM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Bill,

Thanks for the guidelines and the encouragement.

I'm not even ready for a balsa kit yet until I can fly. ha But the spad seems like it could take a licking and go on ticking, as long as it doesn't do the dirt auger bit and spoil the engine.

The biggest spads, with plans, are about 48" wingspans. My Eagle is about 63" wingspan and I'd want the spad wingspan span at least that, maybe even 96".

Now I will show my inexperience with a few questions about wood. I was thinking of using a hand picked, as light as I can find, spruce 2x4 for the spar. I have a table saw I can cut wood as thin as a sheet of paper with, well almost. I was thinking of doing that instead of experimenting with balsa. By doing that I can make the wing thicker than with the yardsticks.

I was also thinking that by cutting two pieces of the stock to about half the desired final thickness and using CA to glue it together, but taking care to turn the grain to run in opposite directions, it might make the wood stronger than the same single piece of stock cut to the desired final thickness.

Any thoughts on these ideas?

Thanks,

elad

William Robison 10-08-2003 01:16 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Elad:

A good quality, well cured spruce 2x4, and a table saw, should give you a lot of good wing spars. But the spar is not the source of a SPAD wing's strength.

The real strength of a SPAD wing is its (almost) triangular section, so long as the triangle does not collapse they approach being inpossible to break. The yardstick keeps the section from collapsing.

The exception is in the larger planes, where a joint is necessary to get the desired span. Then the spar has to be strong to prevent failure at the joint.

Gluing two thinner pieces side by side will not be materially stronger than a single spar of the same thickness. And spruce glued with CA will probably be weaker, since the CA doesn't work well on the harder woods. An easy strong spar is basically an I-beam. If you decide yu need a 3/8" thick spar, 1 1/2" high for example, cut two sticks 3/8"square, and fill between them with a 1/8" web, with the grain of the web running vertically between the top and bottom sticks. If you cut shallow grooves in the top and bottom sticks for the web to fit into it's even stronger. And use a good grade of white glue for assembly. Epoxy will also work, but you need to be careful, epoxy can add a lot of weight in a hurry, and be sure to use a very slow cure if you decide on epoxy. The one hour and faster epoxies are not as strong as they could be.

This should be enough to get you started, and maybe bring up some more questions.

Bill.

Sincraft 10-08-2003 08:30 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 

maybe even 96".
Now THERE is something that would qualify me right out of my airfield. I did a true measure yesterday when I was flying er, afterwards. And it is 200ft x 27 feet paved. With a 27 feet on each side leway before you either 1. kill buildings or 2. drop over a hill with boulders. Overshooting the runway is bad bad bad bad and undershooting is pretty bad. SO something THAT large, although what I have wanted to build for a long time...would put me into a new airfield. sigh. Well back to dreaming I guess. I am not even sure how I will handle the landing with this bipe if I get it finished and fly it eheh.

S

elad 10-08-2003 09:45 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
Bill,

Thanks for the information. At this point you gave me all the answers I need. I'm just looking for simple and quick until I want to get a lot more involved in building. Even then, I'll probably just buy a kit.

Constructing the web, etc. for the I-beam sounds like much more than I want to get into at this time. Since the strength of the coroplast wing comes from the shape of the wing and construction of the wing material I'll just take the easy route of making the plane bigger than the plans call for.

I'll venture a guess that when considering engine size I can just weigh the plane and compare what's commonly offererd for the same size/weight of commercial kits. Will that work?

elad

elad 10-08-2003 10:30 PM

RE: Eagle 2 ARF & 4 Stroke Engine?
 
S,

I wish every model RC flier could have as nice a flying field as my club has. Our landing strip is about 3,400 feet long, was at one time the town's airport landing strip and is still used as the taxi way. A few weeks ago a Cesna 182 taxied past waiting club members on it's way to the new runway.

The members of the club realize how fortunate we are to have access to such a nice facility. We're not charged any fees and don't have to do any maintenance.

elad


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