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

My new .15 speed plane

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Old 10-21-2005, 06:45 AM
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acr007
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Default My new .15 speed plane

I am building the following own design 0.15 pusher speed plane ...well sort of speed plane....

Will post some pics soon....


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Old 10-21-2005, 08:40 AM
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Default RE: My new .15 speed plane

Can you make the file with the plans available? I think I would like to try to build one here on this side of the pond. Looks nice.


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Old 10-21-2005, 08:47 AM
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Default RE: My new .15 speed plane

One problem I had with a .15 pusher I built some time ago, was the lack of a variety of pusher props. Of course if you have a reverse rotation engine you're off to the races. I ended up using a wood 7-4 Zinger pusher, which moved along respectably actually but pitch speed wasn't all that high.

I see though that APC has a 7-6 pusher - wish that was around when I needed it! That ought to do well, stock or trimmed a hair.

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Old 10-21-2005, 08:56 AM
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Default RE: My new .15 speed plane

BTW if you make the fuselage the right diameter, you could use a light weight rocket nose cone for the nose, either blow molded or balsa.

for balsa: http://www.balsamachining.com/CONES.htm

or plastic, Estes and some other companies make thin wall blow molded cones for model rockets. The molded cones for high pwoer rockets are a little heavy though, for example the 2.1" ogive cone I looked at just now is 9.5 inches long and weighs 3.5 ounces. That could probably be reduced to 3 ounces or so by trimming off the base (not needed) and shortening the shoulder that inserts into the cylindrical body tube. But still a bit heavy.

Just a thought!

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Old 10-24-2005, 08:25 AM
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Default RE: My new .15 speed plane

Thanks for comments. Plane had first flight this weekend and flew well of a bungee...its the only safe way to launch as it has no landing gear. Flew well CofG was set about 1.5 inches ahead of plan as I always fly slightly nose heavy on a proto type. Will experiment some more with CofG and need a new engine as my 5 year old enya has finally given up the ghost. I will strip it tonight and see what gives but I think its for the bin/parts.

I alsso need to rework plans as they are very rough plans not like you get in the kits. They are good enough for me but not for a novice builder.

I tested the plane with no rudder just elevons.. very stable flies well.. good response at all speeds and very good glide as wing loading about 12 psf.

Will fit new engine this week and rudder as want to be able to do flat spins etc which it should do vey well considering its really a flying wing.

Also have some decals to add to make it stand out a bit, also working on the design of the decals.

I would like to scale up for a tt36 pro engine and an 9*6.

So plans to follow soon in next month and yes limited props.

But yes could make engine a lefty...have not tried that yet but would give me a bigger selection.


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Old 10-24-2005, 03:06 PM
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Default RE: My new .15 speed plane

Ah, didn't realize you were that far along. No need for nose cones eh?

So you had no problem snagging the prop with the bungee? Did you use a rail and sled type arrengement or just a hook?

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Old 10-24-2005, 03:23 PM
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Default RE: My new .15 speed plane

Cool design. Pics would be good if you have the time. [sm=tongue.gif]
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Old 10-25-2005, 03:34 AM
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Default RE: My new .15 speed plane

The bungee launch is easy if you use an esay release hook and a metal ring on the bungee and no pedal release needs to be a two man job, as helper holds plane and releases on the bungee. This prevents any bungee snagging which has happened in the past on the pedal release launches. I have attached two photos front and back from my mobile phone as the digital camera is on the blink. I will make the decals bigger on the next version so the cover the whole of the wing.
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Old 10-26-2005, 10:30 AM
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Default RE: My new .15 speed plane

[size=2][I have just work o the design for ver 2. It will have a bigger sweep in the wings extra 2.5 inches and bigger span 40 and a shorter nose bigger fuse for bigger tank and a tt36 pr engine at about 10 oz. increased wing area keeps wing loading at about 14 ozpsf. Any way her is a picture of the draft drawings.


/size]
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