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Search: Posts Made By: Dean Pappas
Showing results 1 to 21 of 21
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Forum: Electric Pattern Aircraft
07-13-2015, 04:58 PM
Replies: 2,031
Views: 683,955
Posted By Dean Pappas

Hi All, I had a chance to take part in a...

Hi All,
I had a chance to take part in a pre-NATs tuneup with Ron and Dave Lockhart last Saturday and I can happily report that the Allure has the proper yaw stability with a Contra.
Regards,
...
Forum: Electric Pattern Aircraft
04-16-2015, 05:24 PM
Replies: 2,031
Views: 683,955
Posted By Dean Pappas

Hi again, Brenner. I found that section, and...

Hi again, Brenner.
I found that section, and WOW ... there is no question in my mind that you made quite an improvement in bearing and gear life with the improvement in stiffness of the system....
Forum: Electric Pattern Aircraft
04-16-2015, 10:39 AM
Replies: 2,031
Views: 683,955
Posted By Dean Pappas

Hi Brenner, I was certain that you'd thought it...

Hi Brenner,
I was certain that you'd thought it through!
So you are somehow clamping to the motor's output shaft?
Many moons ago I noticed how much heat my wet engines lost through the spinner...
Forum: Electric Pattern Aircraft
04-16-2015, 07:50 AM
Replies: 2,031
Views: 683,955
Posted By Dean Pappas

Hi Brenner, The prospect of a 5 ounce weight...

Hi Brenner,
The prospect of a 5 ounce weight savings with the Kontronic motor is astounding.
Can I assume that you've discussed this application with Herr Konrath?
Maybe the RPM rating for the...
Forum: Electric Pattern Aircraft
05-11-2013, 01:03 PM
Replies: 2,031
Views: 683,955
Posted By Dean Pappas

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Hi Jim,
I'll bet it would scare you.
take care,
Dean
Forum: Electric Pattern Aircraft
05-10-2013, 12:47 PM
Replies: 2,031
Views: 683,955
Posted By Dean Pappas

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Hi Jim!
Do you mean the location of the wing in my crude little model? If so, please ignore that: I drew a wing in there just to lend credence to the notion that you were looking at the side view...
Forum: Electric Pattern Aircraft
05-10-2013, 09:27 AM
Replies: 2,031
Views: 683,955
Posted By Dean Pappas

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

The plank?
Naw, that was Nat Penton's "UM" series of planes. Nat said it stood for Ultimate machine, but I know it was really ugly M.... !

As far as the effect during cruise is concerned, it...
Forum: Electric Pattern Aircraft
05-10-2013, 08:23 AM
Replies: 2,031
Views: 683,955
Posted By Dean Pappas

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Hi Gang,
Hopefully the picture uploaded.
I modeled the fuselage as a 75" long, 10" tall plank with a 6" tall and 10" wide fin/rudder at the back.
The prop(s) were modelled as 10 square inches...
Forum: Electric Pattern Aircraft
05-09-2013, 01:18 PM
Replies: 2,031
Views: 683,955
Posted By Dean Pappas

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Hi Guys,
Yeah Brenner, 1/4" was too low, I rechecked my verrry crude calculation and came up with a little ove 1/2" ... Ooops!
But, I will recalculate (hopefully tonight) complete with a diagram...
Forum: Electric Pattern Aircraft
05-09-2013, 11:22 AM
Replies: 2,031
Views: 683,955
Posted By Dean Pappas

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Hi All,
One could just move the wing forward in the fuselage about 5/8 inch.
That's my conservative estimate of how much the extra prop destablizes the airplane in both pitch and yaw.
I'll do...
Forum: Electric Pattern Aircraft
03-07-2012, 07:48 PM
Replies: 2,031
Views: 683,955
Posted By Dean Pappas

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Send it or post it, please, Brenner.
Dean
Forum: Electric Pattern Aircraft
03-05-2012, 08:53 PM
Replies: 2,031
Views: 683,955
Posted By Dean Pappas

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Thanks for the clarification, Brenner.
Dean
Forum: Electric Pattern Aircraft
03-05-2012, 11:58 AM
Replies: 2,031
Views: 683,955
Posted By Dean Pappas

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Hi,
Wouldn't that be a 50-50 torque share?

Dean
Forum: Electric Pattern Aircraft
02-21-2012, 07:22 PM
Replies: 2,031
Views: 683,955
Posted By Dean Pappas

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Hello Jim,
Yes, the CG would travel with the wing.

Tony, I should have known that you'd know about this effect. Sorry I missed it in the never-ending thread!
Now I need to find the arcane...
Forum: Electric Pattern Aircraft
02-21-2012, 07:20 PM
Replies: 2,031
Views: 683,955
Posted By Dean Pappas

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Hello Jim,
Yes, the CG would travel with the wing.

Tony, I should have known that you'd know about this effect. Sorry I missed it in the never-ending thread!
Now I need to find the arcane...
Forum: Electric Pattern Aircraft
02-19-2012, 06:04 PM
Replies: 2,031
Views: 683,955
Posted By Dean Pappas

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Hello Friends,
Something that has not been touched on in the discussion, as far as I can tell ...
A single propeller destabilizes the airplane in both yaw and pitch. It is roughly equivalent to...
Forum: Electric Pattern Aircraft
12-28-2011, 08:24 PM
Replies: 2,031
Views: 683,955
Posted By Dean Pappas

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Hi Jim,
As it turns out, just after the Worlds in Ireland, one F3A technical sub-committee member suggested that big electric props were gyros, and therefore E-power should be illegal in F3A!
You...
Forum: Electric Pattern Aircraft
10-13-2010, 10:18 PM
Replies: 2,031
Views: 683,955
Posted By Dean Pappas

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Thank you, Gentlemen ...
What a shame: no torque sharing and gear maintenance.
Back to the drawing board.

Dean P.
Forum: Electric Pattern Aircraft
10-12-2010, 10:37 PM
Replies: 2,031
Views: 683,955
Posted By Dean Pappas

RE: Contra Rotating Propeller Drive for f3a 2m Pattern Planes

Hello Brian / Serious Power

Did I read correctly? Did you suggest that you've seen a belt-drive contra-rotator?
Details, please!

Best Regards,
Dean Pappas
Showing results 1 to 21 of 21


 
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