"1/2 A" & "1/8 A" airplanes These are the small ones...more popular now than ever.

High speed designs?

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Old 09-03-2011, 11:31 AM
  #1
Mr Cox
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Default High speed designs?

I have a few quick, or at least zippy, 1/2a planes but once you get use to it, and get the correct CG and control throws etc, they are not really that fast. Sure the engine screams a lot but I would like to try something that actually flies fast too.

Any recommendations for something that will fly fast on a Norvel .049-.061, kit or drawing? I have a Q200 drawing lying somewhere I think but it seems like 150 would be enough for a total weight around 10oz?
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Old 09-03-2011, 12:26 PM
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Default RE: High speed designs?


Maybe a speed 400 pylon racer would convert well.
http://www.soaringusa.com/products/product.htm?product_id=16214&category_id=265
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Old 09-03-2011, 01:18 PM
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Default RE: High speed designs?

I think it is probably about time that I had a go at a sheet wing racer, I just remembered that there was some good discussion and a nice drawing in this thread; [link=http://www.rcuniverse.com/forum/fb.asp?m=9887253]1/2a SWR[/link]
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Old 09-03-2011, 01:39 PM
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Default RE: High speed designs?

ok,
but if i see another good design i will post it here.
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Old 09-03-2011, 02:33 PM
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Default RE: High speed designs?

NA...
This may be old news to all the guys in the UK and Euroland, but I recently ran across a SWR kit by B.V.R.Kits called the W.A.S.P..
That stands for Wicked Airborne Subsonic Projectile. There were evidently three versions:WASP 40, WASP 2.5CC, and WASP lightweight for engines .049 to 2.5CC. My version is the lightweight. The fellow I got it from said it was pretty expensive originally at L60 Sterling or about $100 USD today. There is a copy of an RCM&E article Volume 41 Issue 1 on the 40 size that came with it.
This may be what you're looking for.The telly # is 01228 560100. FWIW..............Steve
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Old 09-03-2011, 05:57 PM
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Default RE: High speed designs?

NA...
FYI...I Googled B.V.R. Kits just now and Nigel Hawes has a website that was last updated in 2006. He had 3 or 4 interesting models listed including the P.R.A.T. ( Pylon Racer Advanced Trainer). It might take some work locally in the UK to see if this company is still alive and kicking..........It would be good to know although the weak dollar puts the price pretty high for us in America......FWIW.
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Old 09-04-2011, 03:02 AM
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Default RE: High speed designs?

Hmm if i get into a conversation with any of my aeromodelling friends i will be sure to inquire and there are three ff events coming up if i go i will ask around but it does not look like i will be going to any this year
but i will keep an eye out for any news of them.
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Old 09-04-2011, 05:51 AM
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Default RE: High speed designs?

http://www.rcuniverse.com/forum/m_82..._1/key_/tm.htm

Mine is damn fast, give it a go.

this is two years ago before I had any idea how to fly, just holding on for the ride. http://vimeo.com/7763352
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Old 09-04-2011, 09:06 AM
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Default RE: High speed designs?

Any drawings on that?

Did you make it 5" chord and 26" span on the wing, and wing-it for the rest?
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Old 09-04-2011, 09:25 AM
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Default RE: High speed designs?

Yup, its all TLAR. I just drew a line on the building board for the fuse, the width depends mostly on tank and radio equipment.

Wing, 26"x5"
Fuse 23" long 3 3/4" to the wing LE
tail two 6"x3 1/2" wings 110 degrees apart.
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Old 09-04-2011, 09:53 AM
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Default RE: High speed designs?

Ok, thanks I'll have a go at that then.
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Old 10-11-2011, 07:24 PM
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Default RE: High speed designs?

Just dropping an idea you're way...I flew alot of slope and the one factor that got me to go faster was the airfoil tailored for speed. check the MH or Quabeck foils as I always beat everyone in a dive and to the straight away. I had built a slope jet with a 33" WS and the thinnest Quabeck I could use and I actually took the plane into Dynamic Soaring mode..It Ripped Man
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Old 10-11-2011, 07:48 PM
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Default RE: High speed designs?

[link]http://youtu.be/a-ZR-lqqWSc[/link]

1/4" thick solid balsa sheet wing, flat bottom airfoil. Airfoil is simply sanded to eye on top side only.
With a .061 Cyclon and 4.2x4 APC props it flies close to 150 mph.
There you go....beat that with one of those "scientific" airfoils.
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Old 10-12-2011, 08:49 AM
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Default RE: High speed designs?

The Shrike is a quick little beast with a good .061 on it...Rog
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Old 10-12-2011, 11:17 AM
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Default RE: High speed designs?

This flying wing design isn't as fast as the V-tailed plane. A classic case of "looks are deceiving"........[8D]
It has proven to be real easy to launch and to fly....and not that difficult to build, either.

As with all the other SWR designs for 1/2A power, it is based on 1/4" thick solid balsa sheet for the wing and a flat bottom airfoil.
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Old 10-12-2011, 12:42 PM
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Default RE: High speed designs?

'Bout 2 yrs ago, when the SWR topic was hot, Mike (MJD) showed a pic of (or just mentioned) a SIG airfoiled plank. At the time, I had been trying to get enough nerve to take a razor plane to a beautiful piece of very flat, very lite, complete with spruce spar 1/4" balsa plank. Well, the balsa plank is still untouched, & I've gone through a few of the SIG units since then. There is a big difference in weight & quality, so it's best to buy a few of them & then select the best. I usually run between 150 & 180 SQ" wing area, & make a loose copy of a Simple 400 for the fuse & tail feathers. It just can't get any easier.!!! Thanks again Mike. ..................... Then, Like Mr. Cox, thought that I'd like to get something a little more "serious". See the pics of one of this winters projects. GP (Electrifly) Rifle with a .061 D.G. MP JET for power. Pics are with engine just droped in; no mount. Plenty of room on the inside, but jeeze, that plane sure looks small. Even though I've got 6 months before the maiden, (We get about 8 months of winter here) I'm already intimidated. ............ George K.
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Old 10-12-2011, 01:40 PM
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Default RE: High speed designs?

mtntopgeo I hate to tell you but that GP Rifle will be slow on the glow/ you might get to around 90 or so. that plane is heavy and has thick trailing edges. I was going to buy one and looke at it in the store and put it right back in the box. it is cheap though.

The fastest airframe you will get is one of the Speed 400 all carbon planes with about 108-125" range. they can be built to 8-9 ounces ready to fly no fuel. i didnt have a great engine but was able to get around 140-145 with mine.


http://www.soaringusa.com/products/p...ategory_id=265

http://www.soaringusa.com/products/p...ategory_id=265


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Old 10-12-2011, 02:53 PM
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Default RE: High speed designs?

Airraptor, Yes, I agree; This Rifle/MP Jet ain't gonna be a top end blur, but I think that it's gonna be faster than the stuff that I've been playing with. Especially when you consider that big, boxey, slab-sided fuselage that the simple 400 has. ................ I had looked at Esprit, Soaringusa, Icare, & Nesail. I was totally overwhelmed, & didn't feel comfortable spending the extra bucks on something that I didn't have a clue about. I'll take note of your recomendations, & if I don't have a heart attack during the first flight with the rifle, will head in that direction. ....George K.

Will try again, to get the pics out.
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Old 10-12-2011, 03:04 PM
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Default RE: High speed designs?

Well one made it through; Let's try the other. ........ George K.
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Old 10-12-2011, 11:10 PM
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Default RE: High speed designs?

If you guys want to know anything about Sp400 planes and similarly sized fast electrics, I'm the guy to talk to. I used to race them at the NATs until the event died and produced kits for other racers. There are still some really good airframes for sale on the internet and the level of prefabrication is very good these days.
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Old 10-13-2011, 09:30 PM
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Default RE: High speed designs?

This is most likely my fastest 1/2A plane, but it never got clocked. It was built and flown in 2005.
The engine was run by Bill Hughes at a FAI World Championships and I bought it from him ready to rock.
I estimated the top speed around 160 mph, based on what I knew 160 mph looked like with Q500 racers.
The G&Z .061 ran at 42,000 on the ground [add close to 10% rpm as a rule of thumb for unloading].
4.2x4 APC prop as well as some carbon props from Steve Wilk [Eliminator Props].
The sound it made was Satanic.
By the time the plane was retired, the paint on the fuselage in the engine area was roasted dark.
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Old 10-13-2011, 11:34 PM
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Default RE: High speed designs?


Quote:
ORIGINAL: combatpigg

This is most likely my fastest 1/2A plane, but it never got clocked. It was built and flown in 2005.
The engine was run by Bill Hughes at a FAI World Championships and I bought it from him ready to rock.
I estimated the top speed around 160 mph, based on what I knew 160 mph looked like with Q500 racers.
The G&Z .061 ran at 42,000 on the ground [add close to 10% rpm as a rule of thumb for unloading].
4.2x4 APC prop as well as some carbon props from Steve Wilk [Eliminator Props].
The sound it made was Satanic.
By the time the plane was retired, the paint on the fuselage in the engine area was roasted dark.
HOLY SH**!!!
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Old 10-13-2011, 11:44 PM
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Default RE: High speed designs?

Big Al, that's what I said the very first time I released that plane......[:-]

ThrustHP estimates the static thrust at something like 1.8 pounds, and that plane didn't need much of a push to get going.

Here's a control line design from Steve Wilk that looks easy to build.........
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Old 10-15-2011, 08:03 AM
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Default RE: High speed designs?

To get 100 mph speed out of a 1/2A powered plane, you need a 4.2 x 4 prop and an engine that can reliably turn it in the neighborhood of 27-28,000 rpm in the air.
A well prepped TD, stock KillerBee, stock VA or stock Norvel can do it.
Once you arrive at this reality, the next thing to realize is that the smaller, thinner, lighter and smoother you can make the whole package, the better chance that 4.2 x 4 prop will have of pulling the plane efficiently.

1/4" thick wings seems to be a practical low limit. The compromize between stiffness, lightness and aerodynamic qualities.

This little Projeti would make a good looking sheet wing racer. .just take this photo and scale it so that the root chord is 8 or 9 inches and the overall wing area comes out to 150 sq inches. I would stick the engine in front and have the aft end of the fuselage taper to a chisel tip.
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Old 10-25-2011, 10:35 AM
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Default RE: High speed designs?

This is a very simple design and fast.

Think it will be very aesy to upscale and acomodate a .049 motor.

http://www.stevensaero.com/StevensAe...L-p-16631.html







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