New Flight: Pitts -Skelton Aerobatic model (page 9)

Thanks Brad for your time! Here are the screenshots.

Kim wrote:Looking Great, Mauricio !!!!!!!!!!!!

Kim, it is an honor for me that you are here too! ... Sincerely!

1/2A Nut wrote:What is the all up weight and total square inches of the combined wings?

Comparison between PITTS and BI-HAWK

PITTS
Wingspan: 29.8 inches (top wing)
Wingspan: 21.02 inches (bottom wing)
Fuselage length: 19.88 inches (including rudder)
Engine: Norvel .061 r / c
Radio: 4 channels (engine, spoilers, rudder, depth)
Weight: 630 grs = 22.2226 zz

BI-HAWK
Wingspan: 30.11 inches (top wing)
Wingspan: 25.98 inches (bottom wing)
Fuselage length: 21.65 inches (including rudder)
Engine: Cox Medallion .049 r / c
Radio: 4 channels (engine, spoilers (lower wing only), rudder, depth)
Weight: 554 grs = 19.54 oz


Wing load PITTS S-1:

Bi-Hawk
A1 = 765 mm x 120 mm = 91800 mm2
A2 = 660 mm x 120mm = 79200 mm2
A1 + A2 = AT = 91800 mm2 + 79200 mm2 = 171000 mm2
171000 mm2 to in2 = 265,05053 in2
Alar Load = Weight / Total Area = 554 grs / 265,050 = 2,090 grs / in2

1/2A Nut wrote:Thank you Mauricio  

 

You have taught me a lot of friend, it is a pleasure to share information here!
What do you think? .... do you like the wing loading of the Pitts ??

Thanks Brad !, I think the Norvel .061 r / c will take it very well, I think it is a more similar relationship to the real flight, but anyway everything is to see what happens at the time of the flight.
I will be measuring the pulling force of the motor shortly.
Due to the restrictions in my city (Covid 19), I must wait for the appropriate moment to go flying ...

Thanks friend for this valuable contribution, I do not have the possibility to get the APC 6x4, here everything seems to get a little more complicated .
Here are my tests with my available propellers:

Umm... Am I reading this right?

The APC 6x3 ran 17790 RPM, and has a pitch speed of 40
The MA 6x3 ran 15930 RPM, yet outran the APC with a pitch speed of 60.3?

Very Impressive my Friend !!

1/2A Nut wrote:APC 6x4 Sport Propeller is a very good 1/2A prop for thrust and reasonable pitch speed:

Just curious, but that looks like an "E" (electric) prop. Is it? Is the prop strong enough to withstand the impulses of a nitro glow motor?

And yes friends! The great moment has arrived!
After several attempts to take off, I had to make the following corrections:
1) propeller change, needed more traction.
2) minimization of controls on all controls.
3) Incidence of the upper wing 1 degree, lower wing 0 degrees, stabilizer 0 degrees.
4) Let it run for many meters, the grass track slows it down a lot, so there is no need to rush, just let it go and touch the elevator gently.
5) The Norvel .061 motor takes it very well, although it fits perfectly, maybe a .074 or more motor, you could have fun doing crazy things.
Conclusion: I AM HAPPY! nothing more to add!
To my brothers, especially José Emilio, Lucio and all of you my love and gratitude, for being there, for being part of this, God bless you!

I E-kiA!! Great flight !! Very Happy for you to go fly with the new bird and come home all in one piece !! Love the sound with the full cowling / engine Very happy for you Friend!! Large Hug!! and enjoyed the build thread !! What prop did you decide on ?

Congratulations Mauricio very nice flight and model. I am glad you could finally do the maiden flight despite Covid!

FANTASTIC !!! Really enjoyed the build and video of the flights .  

                            Mike1494

THANKS GUYS!!!        
Well, I am experimenting with new propellers, this time a Master 7 x 4 G3, it seems to go very well in static, the engine reaches 11500 rpm with a force of 410 grams. It will be a matter of testing in flight.
I have also changed the anchors of the upper wing, the material used before is very hard, but brittle at the same time, so I made all that new with MIDWEST wood that will certainly last forever.
I will continue to share the progress.
Brad, what do you think about cutting the propeller? APC I don't have in STOCK





Another good news is that Mary from Outerzone (  https://outerzone.co.uk )has updated the page with the images and data of my Pitts, so maybe more friends want to make one! : https://outerzone.co.uk/plan_details.asp?ID=6495
I'll keep up with the news!