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

MauricioB on Tue Jul 28, 2020 5:45 am

Thanks guys!!
Yesterday was a very windy day, with gusts between 30 km / h and 38 km / h, the sky quite covered by cloudiness, so there was no good light to make it look better in the video, but the important thing is to be able to transmit the result of the work done here.
The Pitts flies incredibly well, very firm and safe. There was no need to trim, just play with him in the sky.
As I flew with it, I began to feel more secure, but since the beginning of the recent tests, I realized that everything had changed for the better.
The design of the plane is perfect, so I recommend the plane for those who want to try or build it, the details of structural modification to convert it to radio control are here in this thread, so I encourage you to try it.
Regarding the indicated motorization, I maintain that the Norvel .061 rc, is sufficient, of course, we must take into account this detail of the displacement of the propeller and thus ensure the real traction of the propeller. A .074 can be placed, of course, but I am sure that if the propeller is not displaced enough, the problem will persist.
Regarding the set-up of the (CG - center of gravity), I have respected the point indicated by the plane, no more and no less, with a nose dive nose about 20 degrees down logically.
Incidents: Upper wing 1 degree
Bottom wing: 0 degree
Stabilizer: 0 degree
Motor - engine: 2 degrees to the right (as if you were sitting in the cabin) and 2 degrees down.
In a matter of command movements, you should initially move in this order:
Ailerons (x4) = 4mm up - 4mm down
Elevator = 6mm up - 6mm down
Rudder = 7mm left - 7mm right
Recommendations:
The propeller on this scale must be offset from the motor cowl by 15 mm.
If you use a Norvel .061 engine, the propeller I like is the 7 x 3
With this general configuration, you will be able to enjoy the model airplane in a safe way, you must bear in mind that the sensitivity of command response is immediate and therefore, you must be prepared to fly such a model.
My recommendation: It is not a model for beginners, you must have some experience to fly this type of aircraft.
Thank you all for the support and accompaniment. I Love This Forum!

God willing, I'll share more flight videos. Flying

1/2A Nut on Tue Jul 28, 2020 6:21 am

I vote to try the 6.75x4N Old Bugger

MauricioB on Wed Jul 29, 2020 9:38 pm

My friend! United States

... on the next flights I will try the modified propeller and I will be sharing the experiences !! ... but I am so comfortable with the model as it is, that I want to fly it and fly it more !!! Beers

1/2A Nut on Thu Jul 30, 2020 7:05 pm

Thank you Mauricio you will like the extra performance. Popcorn

MauricioB on Fri Jul 31, 2020 11:02 am

1/2A Nut wrote:I vote to try the 6.75x4N

Dear friend, this morning I went to test propellers, so first I flew with the original 7 x 3 MAGF3 and then with the 6.75x4N (modified MA).
There is no video because my time was limited, but I tell you that it DOES NOT RESULT, because the model begins to taxi almost asking for help, it does not pull it, it does not pull it properly, so abort the two takeoff attempts, because if it took off, it would make the flight critical, especially in turns.
This is an aerodynamically model with a lot of crash surface, perhaps the 6.75x4N propeller, it goes in a much more aerodynamic model, but it is not the case of the PITTS.
Definitely, I go back to the original MAGF3 7x3 and I stay comfortably there, the model takes off in 25/30 meters and in all turns it comes firm, well sustained. Even when decelerating, upon landing, the propeller continues to pull the model smoothly. It's all friend what I could say from my experience here.

New Flight: Pitts -Skelton Aerobatic model (page 9) - Page 10 20200733

New Flight: Pitts -Skelton Aerobatic model (page 9) - Page 10 20200734

Definitely the MAGF3 7x3, it is the best configuration for my PITTS.

New Flight: Pitts -Skelton Aerobatic model (page 9) - Page 10 20200735

1/2A Nut on Fri Jul 31, 2020 12:22 pm

Thank you for sharing Mauricio,
Looks like every bit of thrust is very critical to take off from the grass with the small wheels.
Lucky the 7x3 works, you have found the best prop to get it up in the air safe with the .061 engine.

The modified prop looks good.
6.75x4N may find a good home for another project one day such as with a Norvel .074.

I am happy you are able to fly the Pitts with your .061 now you can rest and enjoy it Very Happy

MauricioB on Fri Jul 31, 2020 9:48 pm

This is my friend, what better way to go to the bottom and then get the best possible result! ... Well, I got here, today I had a good time inverted my PITTS, with some loops and barrels, the truth is that I am getting used to it.
It is my preferred 1 / 2A model, it is beautiful and it flies incredibly well .... now I am thinking of manufacturing a custom cone in aluminum alloy .... we will see .... Very Happy

1/2A Nut on Sat Aug 01, 2020 10:35 am

29mm dia. here you would have to make a adapter for IC use.

https://www.dymondusa.com/Prop-Accessories-30090-29mm-Alum-Electric-Spin.html

Popcorn

Surfer_kris on Sat Aug 01, 2020 2:35 pm

Congratulations to a well working plane and set-up. Smile

I'm a little surprised to hear that the 7x3 prop works well. I can understand that it is a good match to the plane, but in my experience it is too much prop-load for the .061 engine. So if you still want to experiment a bit more with props, I would recommend to trim a little of the tips off from the 7x3 prop (shorter, not narrower). That way you will get closer to the power band of the engine, and get more power out of it.

Regarding spinners, I like the ones from MP-jet (available down to 30mm), they are a direct drop-in on the Norvel .074 (M4 thread) but will need a DIY adapter for the .061 engine (M3 thread). You can buy them directly from Mp-Jet, here is a link to their IC spinners: https://mpjet.com/shop/gb/721-metal-spinners

Here is one mounted on the Norvel .074:

New Flight: Pitts -Skelton Aerobatic model (page 9) - Page 10 Img_1217

MauricioB on Sat Aug 01, 2020 4:59 pm

Hi Kris, thank you very much for this information. It is very useful.
Ordering any of those accessories can take months to get here, but I'll think about it, in the meantime when I have time, maybe I'll make a special cone for my PITTS.
The 7 x 3 propeller, I really like how it goes, the whole flight is safe even when I reduce the throttle of the engine, the model is still "on" in the air, it feels like it flies and not that it is going to fall ... So for this plane, I think it is the best configuration.
It is like driving in mud with large, wide tires. You will not have much speed, but you will keep your course safe on your journey.
anyway if you watch the video in detail, you will also notice very good translation speed of the model!

I will make more videos to share here, I have flown a good journey, and I like how it goes .... more coming soon ...
Thanks Kris!

getback on Sun Aug 02, 2020 9:35 am

I think if ur happy with the setup that's all that matters and it appears to fly very well!! RC Plane

MauricioB on Sun Aug 02, 2020 10:49 am

getback wrote:I think if ur happy with the setup that's all that matters and it appears to fly very well!!

Yes, definitely yes dear friend, I am very happy with the result that I have now, and as I gain confidence, I begin to dare to perform some stunts, logically with their limitations, but it is much more than I expected.
A .061 cubic inch engine, that takes this model in this way and that is also safe, is really admirable, you just had to technically help with the set-up and I have succeeded.
God willing, more videos from PITTS. Beer Cheers

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