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Old 12-16-2007, 10:56 AM   #1
roberthokinson
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Default Have (2) .46 glo engines. What twin engine Plane?

I need some advice on a future purchase for my mixed .46 engines.
One is a .46 OS FX. The other is a Thunder Tiger .46
I like to build. Scratch? Kit? or ARF.

Will there be a problem due to mixed brands?

Please send photos of your candiates and opinions.
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Old 12-16-2007, 02:20 PM   #2
XJet
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Default Re: Have (2) .46 glo engines. What twin engine Plane?

Both those engines are pretty reliable and not too dissimilar in power (the edge would likely go to the TT46Pro) but I don't think it's really a good idea to use different engines on a twin. You'll likely find that the power outputs don't track perfectly (ie: RPMs versus throttle-arm position) so you may end up with some yaw changes at different throttle settings.

If your radio allows setting two throttle curves you might get away witht his -- but you may still have to be careful because the different torque curves mean the engines will likely spool up at different rates or respond to different in-flight loads differently too.

Comparing the price of another engine to that of the total model (airframe, engines, RC, etc) I'd be seriously tempted to recommend that you buy another TT46Pro and break it in on another plane first -- then use it in conjunction with your existing one.

Take a look on YouTube for the effects of engine failures on twins. There are quite a few splatted models out there as a result of engine failure or hesitation on a twin :-(
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Old 12-16-2007, 04:16 PM   #3
jeroli27
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Default Re: Have (2) .46 glo engines. What twin engine Plane?

You could do an inline twin, I have seen people use different size motors before.
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Old 12-16-2007, 05:46 PM   #4
mrbassman
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Default Re: Have (2) .46 glo engines. What twin engine Plane?

Dual Ace 46 made by Seagull. Check the Horizon Hobby website
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Old 12-16-2007, 09:18 PM   #5
superdh
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Default Re: Have (2) .46 glo engines. What twin engine Plane?

some neat twins

http://www.aerospace-technology.com/projects/piaggio/

http://www.squadron13.com/do335/DO335.htm

corrected last link

Last edited by superdh; 12-17-2007 at 12:26 PM.
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Old 12-17-2007, 12:13 PM   #6
roberthokinson
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Default Re: Have (2) .46 glo engines. What twin engine Plane?

[ Home > Twin Engines ARF > Rutan Defiant ]



Rutan Defiant 74 Twin Engine 40
and the Dual Ace 46

May be candidates.

I would like somemore ideas and personal experience withthese and other DUALS that you own and fly.

Superh has a great plan I wish I could think about it.

Thanks for your contributions and please keep them coming.

Robert
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Old 12-17-2007, 12:27 PM   #7
superdh
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Default Re: Have (2) .46 glo engines. What twin engine Plane?

oops, fixed the second link to the d0335
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Old 12-17-2007, 03:49 PM   #8
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Default Re: Have (2) .46 glo engines. What twin engine Plane?

Just go with what you have and see how it turns out.

I have had lots of fun with my first twin engined plane. My trusty Worldstar 40 trainer had been under the bench gathering dust so I decided it was time to either get rid of it or make it fun again. I had picked up a pair of cheap OS25FX engines so I decided to convert it to a twin.

I installed a throttle servo in each wing and made a pair of engine boxes which fit between two wing ribs and hold a separate fuel tank for each engine. The easiest way to finish the nose is to sheet the old engine cheeks but that looks pretty ugly IMHO so I cut the cheeks off and made a fiberglass nose cone. The receiver battery now sits in the original engine mount under the nose cone to compensate for the CoG change.

The plane handles really well and can sustain a gentle climb on one engine which makes single engine recoveries a breeze with a little rudder control. The trick is to install the engines as far inboard as possible and to have about 2 degrees of outwards thrust to help compensate for the adverse yaw on single engine flight.

A pair of .46 engines will haul a light 60 size trainer around nicely.

Enjoy

.
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Old 12-17-2007, 05:54 PM   #9
roberthokinson
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Default Re: Have (2) .46 glo engines. What twin engine Plane?



A possible choice!

Does anyone have one of these? Dual .40 size.
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