Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

I think this qualifies....

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Old 12-15-2009, 07:16 PM
  #1  
combatpigg
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Default I think this qualifies....

..a friend sent me a NIB ASP .12 to play with, to see what kind of speed potential one of these engines has.

Everything about it looks pretty nice, fancy carb, twin bearings, ABC...the rod looks cast but it has a lot of meat around the big end.

The bottom end turned over a little rough / stiff, so I relaxed the tight fit it had in the front bearing. It was smashed in there. A few seconds with 600 grit took care of that, now it spins freely.
The front bearing needed to be lock tited to the case.
I made a venturi to match the diameter of the hole going through the crank.
Raised the liner .002" as a rough guess .

On 10% nitro it turns a 5x5 prop 25,000
On 25% nitro ..................26,000

So far it has recorded several passes in the 120s and a couple over 130 mph.

The plane has 22 inches of span and the same general shape as the Screamin' Demon, but it has a "blended body" type airfoil. It is a good flyer, launches are very steady and so far the landings slow way down...have not broke a prop yet.

The model weighs just over 16 ozs with a 300 mah battery, 2 HS65s and a Spektrum PFer RX.
No fuel tank, just a latex bladder going into a OS.10 NVA.
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Old 12-15-2009, 07:43 PM
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Default RE: I think this qualifies....

I want it.
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Old 12-15-2009, 07:51 PM
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Default RE: I think this qualifies....

very coolcan I buy it?
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Old 12-15-2009, 07:57 PM
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Default RE: I think this qualifies....

Sounds like you've been busy, looks like fun, I love reading stuff like this, keep it comin', and keep up the good work.

BTW can you tell me your parameters for dimensioning your venturi needle valve, /needle dia,body etc... and are you using a generic size for all your venturis?(I guess dia is probably not that fussy really as long as your tapered needle screws in and out varying the amount of fuel getting sucked in)

For my hit and miss stationary engine I've built(another hobby) I used an .018 sewing needle, but drilling that .018 hole for it in the valve body had to be done very carefully, in from each end, but the hole met up nice,(using my Taig mill) but I think next time I'll go at least .030 dia.
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Old 12-15-2009, 08:06 PM
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Default RE: I think this qualifies....

It's within anyone's grasp to build. It would help to have a "full scale" Screamin' Demon build under your belt. Take a Screamin' Demon plan and shrink it to 22 inches. Place a 1/8" C/F spar in where the wing tips meet the leading edge. The [2] center ribs are 1.5" thick, the same thickness as the plastic engine mount. The [2] mid span ribs are about 3/4" thick and the balsa sheeting is pliable enough to form a sweeping compound curve from the thick part of the airfoil down to the mid span rib. The root "airfoil" is formed by the curved balsa sheet, but I made sheeting patterns out of stiff file folder paper instead of experimenting with expensive balsa sheet, so there wouldn't be any waste and a nice tight fit where it butts into the center section ribs.
The cowl is made with a blue foam block tack glued to the firewall and engine mount, then shaped, taped off, then fiberglassed with 4-6 layers of 2 oz cloth. The wing tip angles are eyeballed to look right, they are roughly 2/3rds scale Screamin' Demon tips.
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Old 12-15-2009, 08:35 PM
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Default RE: I think this qualifies....

SRV......for this one I made the venturi the same diameter as the hole going through the crank and made sure it wasn't bigger than the intake window in the case. I use a oval shaped milling bit with a very aggressive look to hog out the tapered venturi shape. I use the back edge of a Xacto blade or file handle to do any touch up shaping before final sanding.
You would need either crankcase pressure or a latex bladder to get good reliable fuel draw. I don't think muffler pressure would work..plus the restriction is no good.
When a bladder is working right, the fuel pressure goes up slightly right before it empties out [the walls return to original thickness], so it cools the engine before shutdown. A weakened, over inflated bladder will cause the opposite, so it isn't fool proof.
I've never attempted to make a needle valve....you got me there! A sewing needle? They do have a nice looking taper....but you can cut threads in one?
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Old 12-15-2009, 08:43 PM
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Default RE: I think this qualifies....

The needle was silver soldered to a brass knob that was threaded to the body, the smallest thread I've turned on my lathe would be 2-56 on brass.
I just realized you are using an OS RNV, sorry, I guess using that is a lot less bother too.
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Old 12-15-2009, 08:56 PM
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Default RE: I think this qualifies....

The OS .10 needle is pretty universal, too. I've used it from .049 to .50s on bladder.

Your sewing needle idea might work to restore some "one of kind" types that I've broken, it's worth a try.
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Old 12-15-2009, 10:11 PM
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Default RE: I think this qualifies....

Very sweet.
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Old 12-15-2009, 10:14 PM
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Default RE: I think this qualifies....

Nice job dude
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Old 12-16-2009, 01:08 AM
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Default RE: I think this qualifies....

Need video...
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Old 12-20-2009, 09:31 AM
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Default RE: I think this qualifies....

[link]http://www.youtube.com/watch?v=oaeeOR0G1Vc[/link]

The pass that lined up with the camera, was also lined up with the windshield of my car and my head.....so 1 pass was enough. At the time I thought, "well, it's only a .12".........
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Old 12-20-2009, 12:06 PM
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Default RE: I think this qualifies....

Sounds nice, yea it's only a .12, going a hundred miles an hour...
Like the hat!
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Old 12-20-2009, 12:17 PM
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Default RE: I think this qualifies....

Eisch Combatpigg, nice colour scheme on that 0.12 ASP powered plane......
That thing was shifting, what is it? Cheers
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Old 12-20-2009, 01:08 PM
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Default RE: I think this qualifies....

pretty good speed from a tiny block. Its all in the airframe,Looked cold there. temp?
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Old 12-20-2009, 01:22 PM
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Default RE: I think this qualifies....

I trade the cold for the 2 feet of snow we got last night!
Some nice drifts from a 60mph NE wind.
I am pretty sure it's going to be a white Christmas here this year.
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Old 12-20-2009, 01:31 PM
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Default RE: I think this qualifies....

12-14" here accumulated, temps are -25 to -28 here these days. Ixnay on flying. My brother was visiting yesterday, so we fired up a pulsejet on the test stand for some quick giggles. It's easy to keep warm playing with those.. and they blow up plumes of snow too.

It's only a .12, it won't hurt a bit! No more than a 1/2 pound rock being thrown at you by a motorcyclist doing 100..

MJD

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Old 12-20-2009, 01:41 PM
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Default RE: I think this qualifies....

IE......The Red Sox have always been a favorite.

MKI....it was about 50 and foggy.

MJD....sounds like you've got better weather for camping with Survivor Man....[sm=pirate.gif]
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Old 12-20-2009, 01:52 PM
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Default RE: I think this qualifies....

They talk like the storm is over it is still snowing here, time for some more shoveling...
Well actually snow blowing, interesting activity with some wind, somehow I always wind up being downwind. It still beats using a shovel though, I got to rig up some solar collectors to melt the stuff.
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