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Dec 15, 2016, 08:41 PM
Registered User
Discussion

Any twin motored Nurflugels out there?


Anyone know of twin tractor props on a true nurflugel plane? Pics are encouraged!!
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Dec 16, 2016, 01:38 PM
InceCreations
vincent123's Avatar
Designing one at the moment , but it has a vertical stab, so it's not a pure one.

See my blog
Last edited by vincent123; Dec 16, 2016 at 02:13 PM.
Dec 16, 2016, 01:56 PM
Registered User
Cool! I was actually wondering about people's experience with twin tractor motors/props without a rudder to compensate any thrust difference.

I know the Hortens had the twin jet engines, but I'm wondering if full props spaced a little wider apart will have a negative effect that would be hard to overcome without rudder in the event of motor failure, or just bad calibration.
Dec 16, 2016, 02:13 PM
InceCreations
vincent123's Avatar
Have no experience ... yet

Same question here.
Figured out that any engine failure will be deadly.
I accept that, no prob.

Differential thrust will always be present.
Made some experiments with 2 50mm EDF's and it turns out that they have almost no difference, hence for my prototype, this item, at least should be fine.

See also:
https://www.rcgroups.com/forums/show...6-Design-phase
Dec 16, 2016, 03:50 PM
You know nothing....
Stuart A's Avatar
I can't think of a tractor,but here's a proven pusher
https://www.rcgroups.com/forums/show...ter-Horten-VII

The pusher configuration helps with stability;maybe that's why tractors aren't common.
Dec 22, 2016, 02:36 AM
B for Bruce
BMatthews's Avatar
And on a proper Nurflugel the rearward extended motor nacelles allow the use of folding props. If used in tractor mode the nacelles would need to be rather long, needle like to allow room for the props to fold. And then they would upset the air flowing onto the wing at and for some distance to either side of the nacelle, would be a de-stabilizing force instead of a stabilizing one and would likely be prone to digging in and highly stressing the wing during less than ideal "arrivals".

If your image of a "true nurflugel" is no fins then the long tractor nacelles would likely over power the yaw stability of the wing. So there again the rearward extended nacelles has a strong advantage.
Dec 22, 2016, 03:16 AM
You know nothing....
Stuart A's Avatar
Here's one.Note the needle nacelles that Bruce mentioned and the large tip fins.It'd be interesting to know if any additional weight was needed to achieve the c/g balance;would a pusher version require more or less?
Aquila's First Flight (2 min 59 sec)
Dec 29, 2016, 11:22 AM
You know nothing....
Stuart A's Avatar
Wingtra - The WingtraOne for Agriculture (0 min 44 sec)

Here's one.A commercial uav.
Dec 31, 2016, 02:40 AM
InceCreations
vincent123's Avatar
Gee, nice plane, has it all ! Including VTOL !
Feb 08, 2017, 05:30 PM
Registered User

Twin Starfire


Does this count ?

Twin STARFIRE thread

I have rudder mix into the motor deferential so I can fly a knife edge and perform stall turns, although I over do it in the first flight until I get use to It.
There is quite some rotational moment once you get it turning/rotating/spinning that has to be stopped.

1.6M Starfire Twin (4 min 20 sec)


... Simon
Last edited by Simon Castle; Feb 10, 2017 at 05:05 AM.
Feb 14, 2017, 10:47 PM
Slope-a-Dope
Steve 0's Avatar
No tails, two motors.

All time favorite of mine.

I finally built a single engine 54" walk along. So smooth in flight.

Slowly Indoor Glider (4 min 51 sec)
May 29, 2017, 10:42 PM
Lee
Lee
PERFECT LANDING !!!
Lee's Avatar
There are a few videos with one of my favorites

http://www.crashtesthobby.com/hercules-66-videos.html

http://www.crashtesthobby.com/hercules-7278-videos.html

Race quad lands on a moving plane (4 min 37 sec)


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