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

1/2A Nut on Tue Jun 30, 2020 7:14 pm

Stats:

New Flight: Pitts -Skelton Aerobatic model (page 9) - Page 7 Static14

GallopingGhostler on Tue Jun 30, 2020 8:28 pm

Basically you are saying, 1/2A Nut, Enya .09-III TV or unmuffled Medallion .09 R/C throttle ring power. Flying a Plane

MauricioB on Tue Jun 30, 2020 10:02 pm

Thanks Brad for your time! Here are the screenshots.

New Flight: Pitts -Skelton Aerobatic model (page 9) - Page 7 Helice10

New Flight: Pitts -Skelton Aerobatic model (page 9) - Page 7 Helice11

MauricioB on Tue Jun 30, 2020 10:07 pm

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

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

1/2A Nut on Tue Jun 30, 2020 11:03 pm

What is the all up weight and total square inches of the combined wings?

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MauricioB on Wed Jul 01, 2020 8:44 am

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:

New Flight: Pitts -Skelton Aerobatic model (page 9) - Page 7 Carga_10

MauricioB on Wed Jul 01, 2020 11:50 am

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 on Wed Jul 01, 2020 8:48 pm

Thank you Mauricio Popcorn

MauricioB on Wed Jul 01, 2020 9:38 pm

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 ??

1/2A Nut on Wed Jul 01, 2020 11:04 pm

Yes will be faster with more acro ability / will act like a Pitts.
Needs a .074 to hover on the prop but the .061 should make
it dance well.

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MauricioB on Sun Jul 05, 2020 10:58 am

Thanks Brad Very Happy

!, 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 ...

1/2A Nut on Sun Jul 05, 2020 8:01 pm

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

New Flight: Pitts -Skelton Aerobatic model (page 9) - Page 7 51xlze10

The Norvel AME .061 should make around 17.5 oz thrust/ 65 mph pitch speed

AP .061 RC / APC 6x4 gas sport prop / 16,795 rpm / 17oz thrust
Static: 64 mph pitch speed / .176 hp - 131.3w
25% nitro / 20% castor oil.

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MauricioB on Mon Jul 06, 2020 11:07 am

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 Crying or Very sad

.
Here are my tests with my available propellers:

New Flight: Pitts -Skelton Aerobatic model (page 9) - Page 7 Ph11

1/2A Nut on Tue Jul 07, 2020 9:50 am

Lovely data

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New Flight: Pitts -Skelton Aerobatic model (page 9) - Page 7 Ph1111

duaneh on Tue Jul 07, 2020 1:11 pm

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?

1/2A Nut on Tue Jul 07, 2020 9:40 pm

Fixed thank you.

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getback on Wed Jul 08, 2020 11:05 pm

Very Impressive my Friend !! RC Plane

GallopingGhostler on Wed Jul 08, 2020 11:15 pm

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?

1/2A Nut on Thu Jul 09, 2020 12:07 am

It is a glow sport prop perfect for 1/2A

I have ran it with a AP .061 / Norvel .074 / TT GP .07 and SH .07

https://www.apcprop.com/product/6x4/

- on the site scroll down for related props.

Note during testing the most static load to date put on APC 6x4 sport
Norvel .074 Kamtechnik Turbo Plug
19,864 rpm / 23.3oz thrust / .292hp - 214w / 75.2 mph pitch speed
+ 1,211 rpm
Vs
Norvel's upgraded Turbo Plug adapter / APC 6x4
18,653 rpm / 21oz thrust / .242hp - 181w / 71 mph

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MauricioB on Sun Jul 12, 2020 1:00 pm

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!

getback on Sun Jul 12, 2020 2:19 pm

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 ?

balogh on Sun Jul 12, 2020 3:40 pm

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

1/2A Nut on Mon Jul 13, 2020 12:00 am

So happy to see the plane has made it through the trim flights MauricioO!

Looks like the mighty APC 6x3 by design proved to be a fast rev / top thrust prop.
Low drag prop tips to get the bird up and away.

What size wheels are those?

Can you go up a bit in diameter to reduce take off distance and
allow other props to get it in the air.

Modified APC 7x4.1SF prop to 6.75x4.1N / 14,600 rpm 567g / 20oz thrust / 57 mph pitch speed. Smile

New Flight: Pitts -Skelton Aerobatic model (page 9) - Page 7 Lp070410

Mike1484 on Mon Jul 13, 2020 8:44 am

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

Mike1494

MauricioB on Thu Jul 16, 2020 8:00 am

THANKS GUYS!!! Very Happy

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

New Flight: Pitts -Skelton Aerobatic model (page 9) - Page 7 A10

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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!

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