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.C. twinjet ?

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Old 07-13-2003, 02:51 PM
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DominicM
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Default I.C. twinjet ?

Anyone put a glo motor on the back of a twinjet ? I've got an Irvine 25 for this but would be interested how anyone had mounted similar engine.
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Old 07-13-2003, 07:02 PM
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Default I.C. twinjet ?

I put a MDS 25 on mine, and it flew well when in the air :-)

I put a perry pump on the engine, and installed the tank in the fuselage right behind the "cockpit windows" This worket out fine.

To get the CG right, I took out the micro servos in the wings, and installed 2 standard servos right under ther cockpit windows. I then cut some new channels into the foam for the sulivan pushrods. I had to use 4 C-cells in the nose for it to ballance right.

This thing weighed a ton like this. It is verry hard to hand launch because og all the weight, and about every 3rd launch was succesfull.... Best in windy conditions, where airspeed is quickly gaind.

but when in the air...... it flew great. Nothing compared to my magnum, but still verry fun. It is verry manouvable. Roll rate can be insane :-)

I have since converted it to electric again....bit the servo layout is still the same.

When I come home from work, Ill se if I can find a pic of it.

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Old 07-13-2003, 08:20 PM
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Default I.C. twinjet ?

Thanks SJN. I had no doubts someone would have done this already. Would be great if you could share some pics.
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Old 07-13-2003, 10:07 PM
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Default I.C. twinjet ?

The Multiplex one, right? Neat idea. I may try it one day. I had an
Electric twinjet. It was a blast. Ran it with Twin brushless motors.

Any problems with fuel eating the foam?
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Old 07-13-2003, 10:40 PM
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Default I.C. twinjet ?

nope......the foam resists everything

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Old 07-14-2003, 12:05 PM
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Default I.C. twinjet ?

Some pics....


The Engine mount made of some alu. sheet so the engine lays sideways. If I where to make it today, I would just glue a fairly large piece of plywood ontop og the fuse/wing, and installe the engine upright. for one, to save weight, and seccond to get the thrust line inline with the wings.....




Servos on velcro latch system


New servo Sulivan pushrods...

hope you can se heads and tails with these pics :-)


Before I chopped her up, I also tried some EDF action :-)







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Old 07-16-2003, 03:39 PM
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Default I.C. twinjet ?

just began to rebuild my old TJ again :-)
I love the way it flys.





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Old 07-16-2003, 06:35 PM
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Progress..... :-)



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Old 07-17-2003, 11:23 AM
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Default I.C. twinjet ?

Thanks for the pics SJN...let us know how the first flight goes
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Old 07-17-2003, 01:43 PM
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Default I.C. twinjet ?

LOL... I've never seen a plane that looks more (ab)used than this one... looks ike a flying testbed or something...

You really like "modifying" planes, don't you SJ?
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Old 07-17-2003, 05:08 PM
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Default I.C. twinjet ?

hehe....yea, It has seen its days..

you wouldn`t believe how many crash`s it has survived, and been rebuilt. The foam is some realy tuff stuff...

love the plane :-)
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Old 07-17-2003, 05:37 PM
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Default I.C. twinjet ?

Nice one SJN! fantastic pics... I was toying with the idea of throwing the SC 53 I had in Magnum2 in the Twinjet but I found that for the cg the engine had to sit midmount in the plane. Would be cool to get a long propshaft spun up and run it as a midmount with just the head popping up out of the canopy but don't have any one handy that can make a balanced 5 inch shaft for me... would be crazy though with a .53.....

What sizes are reverse cut props available in?
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Old 07-17-2003, 06:01 PM
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Default I.C. twinjet ?

Thanks Gricer...

The first try i used a MDS25 and a 9/6 prop.
Now Im going to try out mu os25fp. It is much lighter, amd I hope it will fly better....at least launch easier.
Later Ill put on a webra 36, and it should rock :-)

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Old 07-17-2003, 06:43 PM
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Default I.C. twinjet ?

Put in a west 36t1 and pipe!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! that would be AMAZING

or

If youve got mor money than sence put a west 50v1 in it. instant mayhem!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Old 08-06-2003, 06:34 PM
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Default I.C. twinjet ?

Heading for the field tomorrow.... Hope its windy, so I can gain some quick airspeed. At 1285g and an os 25 I think it will require a realy good shove







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Old 08-07-2003, 07:20 AM
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Default I.C. twinjet ?

By the look of the prop on the back you would want to launch it like a HLG with a discuss throw... not sure if it would work or not but I wouldn't be too keen to send that away with a normal javelin launch, maybe even get someone to launch it knife edge :-) should be extremely hard to control but at least you might have fingers left.....
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Old 08-07-2003, 06:34 PM
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Default I.C. twinjet ?

Success.....well at least after a few setbacks...


After trying to launch the plane for about 12 times. only 2 of the times the plane drifted around tail heavy :-(
I could not believe how bad it flew. I was totaly bummed, and ready to go home, when some of the guys turned up.
I told them how it went, and I was on my way home and going to throw my POS plane in the trash, when one of the guys says "hey, your prop is on backwards" argh #&/##%"#&/""& !!!!! I was verry small at that moment........ how could I bloomin mis something like the prop...sheesh...

well, I turned the prop around, fired her up, and threw her.
Wow...it fly`s

Only two launches out of another 13 where bad, and the tank fell off. Well what to do. I put the tank inside of the fuselage, and some longer fuel lines. And it runs just as good....meybe even better because the engine gets more cooling air.

Flying: well.....this is no rocket at all with an OS 25 FP. And it is no pattern ship either. The flimsy foam gives away a little bit during manouvers, so it doesn`t track like an arrow

But is sure is a blast to fly. And the 100ml tank makes it fly for ages before you have to land.


soooo there you have it...it works

look at all thet mess I have made :-) The first few times it went nose in, and is all wrinkled up.......but its foam..and easy to fix
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Old 08-07-2003, 06:37 PM
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Default I.C. twinjet ?

more pics of the modfication...






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Old 08-07-2003, 10:20 PM
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Default I.C. twinjet ?

Lol... I wouldn't want to be radio equipment in that plane...
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Old 08-07-2003, 10:45 PM
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Default I.C. twinjet ?

hey....its all wraped in foam :-)
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