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100 MPH GLH ASP .12...???

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100 MPH GLH ASP .12...???

Old 01-22-2012, 04:23 PM
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combatpigg
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Default 100 MPH GLH ASP .12...???

Can you go 100 MPH with a $30 engine...?

How about 130 MPH...? There's a big difference between 100 and 130 in terms of power and drag. With a GLH, you can improve the drag problem by making the wing thinner. I believe a stock GLH meets the old pylon racing rules of 1 inch minimum thickness out to 1/2 span.
This wing is 3/4 inch thick, constant thickness, no taper. Building it out of wood is definitely lighter, but for a straight line speed model it might not be any better than going with foam.
The fuselage is being made to accomodate a .10 sized engine and with enough room for the fuel tank to be well padded. I plan on using a Hayes 2 oz tank and either a ENYA .11 or a ASP .12 for power.
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Old 01-22-2012, 05:01 PM
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Default RE: 100 MPH GLH ASP .12...???

I'll be watching!
Old 01-22-2012, 05:09 PM
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combatpigg
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Default RE: 100 MPH GLH ASP .12...???

It's OK to watch...just as long as you're out in your workshop making your fair share of balsa shavings and sawdust too.
For your Nelson. 15.... a 24 inch span delta would be a pretty neat project. I don't think it really matters which version engine you get, the most important thing is to choose the one with the most life left in it.
Old 01-22-2012, 05:17 PM
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Default RE: 100 MPH GLH ASP .12...???

I picked up the nelsons today, they were used in speed C/L racing. One FISE and one FIRE, they have square exhaust exits and they were run open exhaust, also in the package was a C/L FIRE Nelson 40 with tons of pinch and mint looking P/L set in it!
Yes I plan on building a 24 inch sized Screamin Demon for the 15s, oh yeah I also got a spare PL set for the 15s.
Old 01-22-2012, 05:27 PM
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combatpigg
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Default RE: 100 MPH GLH ASP .12...???

WOW..! You really scored a lifetime worth of engines for who knows how many future projects...?
I hear that the Nelson .40s will have parts support for the forseeable future and the .15s should actually be pretty easy to keep going since there were a lot of parts never used by the pylon racers who geared up for a dying event.
Old 01-22-2012, 05:32 PM
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Default RE: 100 MPH GLH ASP .12...???

Probably Al Bakers from Brantford.  He seems to be getting rid of everything now. You can be assured it was in top shape.
Old 01-22-2012, 05:44 PM
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smoknrv4
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Default RE: 100 MPH GLH ASP .12...???

That's exactly where I got these engines! What a nice guy he is, visited with him for quite a while.
Old 01-22-2012, 05:52 PM
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phatboy
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Default RE: 100 MPH GLH ASP .12...???

Im watching as well. Your building exactly what I was thinking of doing! lol
Old 01-22-2012, 06:01 PM
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Max_Power
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Default RE: 100 MPH GLH ASP .12...???

The only thing as much fun as seeing what kind of plane you will decide to build is seeing what kind of interesting brew ends up in the background What kind of flight times do you think the .12 will get out of the 2 Oz? Todd
Old 01-22-2012, 07:21 PM
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combatpigg
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Default RE: 100 MPH GLH ASP .12...???

Todd, some of the bottles you see have my own homebrew in them.....[8D] Today's beer was an over cooked stout that is about 10 weeks old now. It started out real bitter at 6 weeks, bitter, acrid, charred, etc. Then it started tasting like licorice / anise...then it started to taste like liquid rye bread with carroway seed....still pretty nasty. Today's sample tasted more like heavily roasted barley should....but I doubt this batch would ever improve past "mediocre".
The 2 oz tank should give 4 minutes with a screaming .10-.12 I guess. That's more than enough time to go up and take care of business
Old 01-22-2012, 09:42 PM
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Default RE: 100 MPH GLH ASP .12...???


ORIGINAL: combatpigg

Todd, some of the bottles you see have my own homebrew in them.....[8D] Today's beer was an over cooked stout that is about 10 weeks old now. It started out real bitter at 6 weeks, bitter, acrid, charred, etc. Then it started tasting like licorice / anise...then it started to taste like liquid rye bread with carroway seed....still pretty nasty. Today's sample tasted more like heavily roasted barley should....but I doubt this batch would ever improve past ''mediocre''.
You just have to love this guy!!!!
al
Old 01-22-2012, 10:01 PM
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Default RE: 100 MPH GLH ASP .12...???

I've brewed but never made a brew that didn't give me the same "Scintillating Rush" as an enema.
Old 01-22-2012, 10:18 PM
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combatpigg
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Default RE: 100 MPH GLH ASP .12...???

I've brewed with light malt syrup straight from the 55 gallon drum [from the local brew supply]and used hop pellets and had nothing but very tasty ales after 5 weeks.
This crappy batch was jinxed..it was canned dark malt syrup [on sale] that must have been dated and I let it boil way too long while showing some craigslist buyers some stuff I had for sale.
As it turns out, the sale fell through and I ended up with scorched beer.....[>:]
Old 01-22-2012, 10:57 PM
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Big Al-RCU
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Default RE: 100 MPH GLH ASP .12...???


ORIGINAL: combatpigg
The 2 oz tank should give 4 minutes with a screaming .10-.12 I guess. That's more than enough time to go up and take care of business
CP, a more serious comment and a question if you don’t mind.
Four minutes sounds like plenty at the speeds you fly. After 90 seconds of hanging on to the tail of my .010 Mustang I was happy for it to quit.
Now my question for you.
How fast would you predict that it (my .010) actually flew? Everyone that saw it fly thought it was ‘FAST’ but that is of course relative to its small size.
Description:
Wing Span 19in
Wing Area 60 in sq
Weight 4.2 oz
Prop 3–1.25 Grey
Clean airframe.
Don’t’ recall the RPM, but it was my strongest .010 and on its best behavior at SMALL one year several quest pilots commented that it was one of the strongest .010’s that they had ever flown. Maybe 24K or so?
Thanks,
Al
Old 01-22-2012, 11:03 PM
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DeviousDave
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Default RE: 100 MPH GLH ASP .12...???

If you want to see an .010 go fast..... cut the .020 prop down and use it. I took a 4.5-2, cut it to 2-9/32 and swept the tips back. The engine picked up another 2k and it has a lot more pitch. Was worth probably 15mph on my little guy, fast enough to get Best Piston at SMALL this year. Highly recommend it.
Old 01-23-2012, 12:36 AM
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Default RE: 100 MPH GLH ASP .12...???

Al, I thought .010s were supposed to run closer to 30,000 rpm with that prop..?
Let's assume that after unloading it runs at 30,000.....it would be going 30-35 MPH and putting out 3.6 ozs of thrust. Like DD says, try less diameter and more pitch for higher speed.
If the plane is set with conservative throws and proper CG you should be UNHAPPY when it quits.!!
My experience with 2 different scaled Mustangs so far is with the high thrust line [especially if the engine is mounted upside down], they have a tendency to nose dive at launch. The cure is supposed to be a slight amount of upward thrust.....but haven't tried that yet.
Old 01-23-2012, 02:05 AM
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Default RE: 100 MPH GLH ASP .12...???

Dang, I just can't keep up with the building pace around here it seems. Looks like another good design CP.

I had this "conversion" idea last spring and thought it look good for a quick ASP .12 (Enya .11 or MVVS .12), so many good engines and so little time...
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Old 01-23-2012, 04:05 AM
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Default RE: 100 MPH GLH ASP .12...???

Your wing looks much stronger than the original plan I was looking at last nite.

Deva Vu... I was just looking at and preparing to start a GLH myself so thank you and good luck on this build. I was deciding between GLH and Hummer... poss Mach None. Can I ask what made up your mind for GLH? Too many planes too little time

Did you make changes to plan or is there a more recent plan with the improvements/stronger wing spar version?

I'll be watching also

Happy Flying


Old 01-23-2012, 08:41 AM
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combatpigg
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Default RE: 100 MPH GLH ASP .12...???

Mr Cox, that plane looks like it should be pretty fast..! I like the backplate mount. It must be custom made..?

FlyingTom.....I'm not working from a plan. Actually, I have never seen the plan for the built up wing. Since this wing is only 3/4" thick [instead of 1 inch] it needs to be supported better with a good spar layout. Some of these spars are cut in with a razor saw after the wing is framed up.
I think this wing has slightly more span than the original GLH.....this one sits at 35 inches.
The total wing area would be about 240 sq inches here.
I'm also not going to use any sheeting, so the framework and the covering have to be up to the task.
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Old 01-23-2012, 10:20 AM
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Default RE: 100 MPH GLH ASP .12...???


ORIGINAL: combatpigg

Al, I thought .010s were supposed to run closer to 30,000 rpm with that prop..?
Let's assume that after unloading it runs at 30,000.....it would be going 30-35 MPH and putting out 3.6 ozs of thrust. Like DD says, try less diameter and more pitch for higher speed.
If the plane is set with conservative throws and proper CG you should be UNHAPPY when it quits.!!
My experience with 2 different scaled Mustangs so far is with the high thrust line [especially if the engine is mounted upside down], they have a tendency to nose dive at launch. The cure is supposed to be a slight amount of upward thrust.....but haven't tried that yet.

I've never seen a stock T.D. turn the stock 3 x 1.25 more than 27,400 across 6 engines, red tank or black, and I run 40% nitro in mine. The 30K figure is probably industry wives tale from a time when it was hard to find a tach that would read that high is my best guess.

The pitch on the .020 prop goes way up when you start shortening and sweeping it, way more than 2". I really need to get video of this thing, but it's out of commission for the winter-nothing cools you down like model airplane fuel on your fingers while you adjust a needle in 10 degree weather!
Old 01-23-2012, 10:28 AM
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Default RE: 100 MPH GLH ASP .12...???

CP
Is this going to be similar to the GLH II I have seen
I definitely like the spars - the plan I looked at didn't even have full sheeting so I was concerned about strength
This is the plane GLH II I was looking at see attached
FlyingTom
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Old 01-23-2012, 10:55 AM
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Default RE: 100 MPH GLH ASP .12...???

DD, it should be able to hit close to 30,000 in the air...?

Tom, sorry, but I can't look at PDFs. The stock wing is thicker, so there is inherent strength by virtue of that.
I'm not sure what the Jesus Factor is in the stock design if you go with a hot .10 engine.....but adding a couple 3/16 x 3/16 hard balsa or spruce spars is pretty easy and cheap insurance.
Old 01-23-2012, 11:41 AM
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Default RE: 100 MPH GLH ASP .12...???

My .010s hit between 24,000 and 28,000 o 25% nitro and the grey cox prop and really scream I do not usually run on higher nitro than that.
The average for a .010 is 27,000 on I think 30%.
Old 01-23-2012, 03:28 PM
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combatpigg
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Default RE: 100 MPH GLH ASP .12...???

A rule of thumb for unloading is 10% if the engine isn't already overloaded and it's bolted to a plane that will allow the unloading.
So a ground rpm of 28,000 could add 2,800 rpm after the first dive.
Some piped engines will see more like a 20% + jump in rpm.
Old 01-23-2012, 04:21 PM
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Big Al-RCU
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Default RE: 100 MPH GLH ASP .12...???

CP, thanks for your response. I’m sure you are in the ball park; at least it’s a much more informed estimate than I could come up with. Now that I think about it, the .010’s could peg out my Heath Thumb Tach at 25K.

The 90 second remark wasn’t due to the way it flew. In fact it was like on rails and had a fast, flat glide. But my eyes aren’t what they used to be and sometimes the turns were made on ‘blind’ faith[]. Easy to momentarily loose it during part of the turn. That was the exciting part.
Al

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