Fastest .40 sized spad (Full Version)

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acarter -> Fastest .40 sized spad (12/2/2007 8:21:38 PM)

I just got back from flying my pizza box flyer (it's on it's 15th flight) I like it so much that i'm ready to build my next spad.

What's the fastest .40 spad out there, it actually doesn't have to be .40 because i have a OS .40 LA which is more like a .35 so anything between .25 and .40 would work, I would prefer a delta wing design but I'm not 100% sure.

Thanks,
Austin



DLSmith2 -> RE: Fastest .40 sized spad (12/2/2007 9:04:16 PM)

Austin,

Check out the Dogfighter, Bulldawg, or Flipper ( at http://spadworld.net/ ) and I think one will satisfy your "need for speed."

Let us know what you decide to build, and don't forget the pics!

SPAD skies,

DL



acarter -> RE: Fastest .40 sized spad (12/2/2007 10:28:14 PM)

I think that the bull dog is the one for me, i like the looks of it and the construction, the only problem I see is the avialiability of the gutter pipe. I have heard of using the coro to make the fuselage but I have no idea how to do this. I'm sorry if these questions have already been asked[8|]

Austin



Gringo Flyer -> RE: Fastest .40 sized spad (12/3/2007 12:05:01 AM)

The sickle is a good choice too. Its a solid flyer and a ton of fun.



OzMo -> RE: Fastest .40 sized spad (12/7/2007 4:24:20 AM)

search SPAD TO THE BONE for coro fuse or search here[:D] a coro fuse is lighter and stronger if made right and if you do it wrong ...try again, it just a bit o plastic! Just think light and design your own.



somegeek -> RE: Fastest .40 sized spad (12/7/2007 8:30:48 AM)

Coroplast Fuselage w/ Sickle pics.

If you're looking for all out speed, go with a symmetrical winged craft. This sickle moves at a good clip with a .46AX and APC 10x7 prop. Pondering trying a 9x8 next. With this setup, releasing this from my hand when launching at WOT, it seems to lunge out of my hand when I start to release it. The vertical is sick.

somegeek



broke_n_bummin -> RE: Fastest .40 sized spad (12/7/2007 11:41:34 PM)

Have you looked at the Diamond Dust? I built one and powered it with a .40 LA. It's pretty quick and builds fast. It took me a couple tries to get the hang of hand launching a glow ... but I finally got there.



MrGreenSpeed -> RE: Fastest .40 sized spad (12/8/2007 1:04:53 AM)

I'll put in a plug for the Draco ( Terror of the sky's )
It will fly great fast or slow and can turn and burn with the best of them.
It's a flying wing like the Sickle but doesn't have a fuse.
It's a little more complicated to build as it has a tapered LE and TE and a double tapered spar with the servos hidden inside the wing.

http://www.rudigreyling.com/photopage12.html
Jeff



voyager_663rd -> RE: Fastest .40 sized spad (12/23/2007 9:28:11 PM)

My ddust came out kinda heavy (had to use 1/4" ply for the ribs) but I clocked it at 100 mph. Used a 46fx with a 9x9 apc. wing was 35" span.

[image]http://www.freewebs.com/rc_tips_and_hints/35in%20ddust%20with%2046fx.jpg[/image]



huck1199 -> RE: Fastest .40 sized spad (12/24/2007 4:30:14 AM)

Austin

If you have an Agway store nearby they can order 2.5" sq downspout for you. The current price is about $15 for 10'. They say it is vinyl but I think it is pvc. Works well.

Huck



MrGreenSpeed -> RE: Fastest .40 sized spad (12/24/2007 9:32:57 PM)

quote:

They say it is vinyl but I think it is pvc.


pvc = polyvinyl chloride
Yup it's vinyl. [8D]
Jeff



ChrisSpad -> RE: Fastest .40 sized spad (12/25/2007 6:37:19 AM)


quote:

ORIGINAL: voyager_663rd

My ddust came out kinda heavy (had to use 1/4" ply for the ribs) but I clocked it at 100 mph. Used a 46fx with a 9x9 apc. wing was 35" span.

[image]http://www.freewebs.com/rc_tips_and_hints/35in%20ddust%20with%2046fx.jpg[/image]


who knows, you might've gotten more with a 10x7 or 10x8 apc. Mine really unloaded in the air, i was spinning well over 23 grand with a 21 buggy engine, and a 7x6. That was on the smaller size, though. But, with a tt 36, i know it was doing 120+. Just almost too small and too fast to keep up with. I can't imagine it with the same setup and a tuned pipe, or MCP. It was unreal as it was. :D



JohnRC -> RE: Fastest .40 sized spad (12/26/2007 1:42:03 AM)

Here is a SPAD I built with a OS 46 and a tower hobbies muffler.

We clocked it at 130mph

I was using a APC 9x6 at the time running around 15,000. Broke it during landing that is why there is a MAS on it now.

The wing is 48" and has a small Al U channel to make it very slim and strong.
Plan on building a new plane with a JETT 35 to see if I can go faster.



microsprint9 -> RE: Fastest .40 sized spad (12/26/2007 2:13:34 AM)

9x6 at 15000, must have had a very strong tailwind or a very high dive to get 130 out of her, 9x6 at 15000 is only 85MPH pitch speed, how did the engine gain 10000RPM in the air?.

acarter my OS .40la isn't even close to a .35, my Magnum .15 has almost as much power as my .40la

OS .40 LA 11x5 @ 10500rpm .605HP 4.34lbs thrust
MAG .15XLS 8x3 @ 18000rpm .512HP 3.98lbs thrust



JohnRC -> RE: Fastest .40 sized spad (12/26/2007 2:17:09 PM)

The engine is a OS 46AX. The org. muffler removed and the Tower Hobbies muffler from the Tower 46 is used. It will give you more RPM's on the OS.
We Tach the engine up with the 9x6 APC Prop, it usually peaks at 15200 to 15300, then we back it off about 200 to keep it from over heating.

This is how we clock our planes. I use a Robic SC-554 stop watch. (see picture) I get two people 300ft apart, one to signal and one to run the stop watch. When the plane reaches the signal person he drops his arm and the person with the stop watch starts the watch and stops it when the plane passes him we have the mph.
This stop watch has the ability to cal. mph by putting in the distance (300') between to points.

I found that a high dive to the signal person then leveling out slows the plane down. A small dive then leveling out some distance before the signal person gives the best speed. For safety the people are back off the run way in the safe area and the plane is flown accross
the top of the run way about 20ft off the ground.




ChrisSpad -> RE: Fastest .40 sized spad (12/26/2007 3:46:07 PM)

130 mph sounds really high for a 48" wing plane. my 40" dino 2's running similar prop and engine with a screen door spar weren't running much over 100 mph. I suspect that the real issue is your spotters are too close together. Your gettting the advantage of the lack of perfect reaction time from the first spotter. Increase the distance to 600 ft, and i bet your speed drops. Increase it further and it'll drop more.



microsprint9 -> RE: Fastest .40 sized spad (12/27/2007 1:56:14 AM)

JohnRC you might be right, but with a 9x6 at level flight you would have to turn over 24000rpm to get that kind of speed, and that's not including the drag of the plane and i've never seen an engine gain 9000-10000 rpm in the air.



MrGreenSpeed -> RE: Fastest .40 sized spad (12/27/2007 4:01:09 AM)

revs x pitch /1056= speed in miles per hour
Jeff



acarter -> RE: Fastest .40 sized spad (1/5/2008 9:25:01 PM)

Thanks for all of the replies. I'm really interested in the diamond dust. I would be willing to buy a better motor for this plane if it needs the power. Does anybody have any plans for a ddust.

PS. I will post pictures of my build when I start

Thanks again,
Austin



MrGreenSpeed -> RE: Fastest .40 sized spad (1/5/2008 10:32:28 PM)

There should be enough info in these threads to build a DDust.
the zip plans are from Chunky C's web page at http://spadfest.rcspads.com/index.php
http://spadworld.net/archive/viewtopic.php?t=4976&highlight=ddust
http://spadworld.net/archive/viewtopic.php?t=154346&highlight=ddust
[img]http://spadfest.rcspads.com/images/thumb_zip.jpg[/img]
DDUST ZIP click to download.
Good luck.
Make sure You post lot's of pics.[:D]
Jeff[8D]



Cr@shm@ster -> RE: Fastest .40 sized spad (1/6/2008 2:14:35 PM)

revs x pitch /1056= speed in miles per hour

Hey green can you break your formula down for me where does the 1056 come in? Seems like your formula leaves out a lot of variables like windspeed and direction, parasite and induced drag, if your flying in ground effect does it account for that? Also is the speed your finding airspeed or ground speed?



microsprint9 -> RE: Fastest .40 sized spad (1/6/2008 4:34:12 PM)

That formula calculates the prop pitch speed for any given rpm and prop pitch. Wind speed and all that stuff would be near impossible to get an accurate calculation, why this formula was posted was a 9x6 prop at 15000rpm is only 85.23 MPH and unless in a steep dive or one hell of a tail wind 130 mph just doesn't sound right on a 6 pitch prop in level flight. Now the pitch speed would be air moving as a solid, 9x6 prop would move 6" forward every revolution, this doesn't include wind speed or drag of the airplane, it's just a starting point to figure prop speed. While i don't use his formula, i usually use this

6 ( pitch ) X 15000 ( RPM ) = 90000 inches per minute
90000 / 12 = 7500 feet per minute
7500 X 60= 450000 feet per hour
450000/5280= 85.23 MPH



ChrisSpad -> RE: Fastest .40 sized spad (1/6/2008 5:18:14 PM)

the 1056 is the exact same formula as you use, its just simplified - all your doing is converting from inches per minute, to miles per hour. To start, to get the inches per minute, you multiply the pitch (distance the prop moves forward in one rotation) by the number of times it turns in a minute (rpm).
To convert to feet per minute divide by 12-
So X/12 = speed in FPM
to get to feet per hour, multiply by 60
so you get (x/12)*60 = feet per hour (or 5x =fph)
to get mph you divide 5X by 5280.
Then you solve for X = 1056. The 1056 just saves all the in between.



Cr@shm@ster -> RE: Fastest .40 sized spad (1/6/2008 5:53:41 PM)

Gotcha, thank you :)



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