O.S. 56 Alfa 4T RC

Hello dear friends, I want to enjoy my O.S. .56 Alfa, a really beautiful engine! ... so I wanted to share here, that I have recently acquired this Extra, it is a beautiful model of excellent quality ... and I will leave it there at rest while I work on the model project Stylo with Norvel .061 engine.
But I get too excited and order another model for my O.S. . 56 alpha, this is this model: http://www.greatplanes.com/airplanes/gpma1030.php
Soon I will tell you news!
For now here is my Extra:

So full rang RX quality no more single antenna park RX hehe

Looks like a good one, hope you have fun with it!

Ohh no my friend hahaha !!!, this time I will use an RX JR with satellite !!! ... no more lost please !!!

getback wrote:Nice !!!

Eric! How are you? Thank you!
How beautiful is your bitch !!!, how big already !! ... remind me what her name is !?

Well, I'm also with this project ... I've decided to put this model together for my O.S. 56 4T Alfa, I will convert it to glow ... I am manufacturing the templates and then moving on to wood and making the corresponding reinforcements!
http://www.greatplanes.com/discontinued/gpma1186.php

Well dear friends !, I still have my heart hurt after the loss of my Stylo model, I really love these things and even more with the love that I put in my work, but but ... here I go with my Yak 55 EP of Great Plans and my heart is distracted a bit .... here I share with you the custom-made pieces, to fit and turn it into a GP that is from Electric Power to Glow Power ... I'm still working ...

Well folks, finally modify a model of the Great Planes firm, the Yak 55 M EP.
Here the video, I hope you enjoy it!

Please read the warning in this video:

The manufacturer is not responsible for the original modification of the product.
Modification of this product is the sole responsibility of its owner.
Do not do this if you do not have the right experience.
Do not do this if you do not have safe instructions.
Take care of your health and that of the environment.
It is YOUR responsibility to modify the original product.
Thanks for watching the video. I hope you enjoy it.

Great flight and video Mauricio!
When I modified my electric Denight 50 I erroneously  reduced the engine offset angle and the plane tended to turn left after take-off. I have repaired it since then and the OS FS 56 alpha now flies it with the same authority as yours.

In the last part of your vid after landing you have run the engine full throttle for a short time and I heard as if the engine had not revved up to around 10.5k which is the peak of my engine  with a 12x6 APC prop...maybe your Master Airscrew is 13x6"?...is it not running a bit lean?. I turn the needle valve out by about 1.75 turn to make sure the fuel-air mixture is not lean.

Do you have some castor in the fuel? I run mine with the same 20% castor fuel as my COX engines...the  OS has a much higher compression ratio than the COX and burns it at so high temp that the exhaust gases bring a lot of black castor soot in it. Also, the valves get stuck in castor goo if the engine sits long without running..but I still prefer castor to synt..

Happy flying friend!

balogh wrote:Great flight and video Mauricio!
When I modified my electric Denight 50 I erroneously  reduced the engine offset angle and the plane tended to turn left after take-off. I have repaired it since then and the OS FS 56 alpha now flies it with the same authority as yours.

In the last part of your vid after landing you have run the engine full throttle for a short time and I heard as if the engine had not revved up to around 10.5k which is the peak of my engine  with a 12x6 APC prop...maybe your Master Airscrew is 13x6"?...is it not running a bit lean?. I turn the needle valve out by about 1.75 turn to make sure the fuel-air mixture is not lean.

Do you have some castor in the fuel? I run mine with the same 20% castor fuel as my COX engines...the  OS has a much higher compression ratio than the COX and burns it at so high temp that the exhaust gases bring a lot of black castor soot in it. Also, the valves get stuck in castor goo if the engine sits long without running..but I still prefer castor to synt..

Happy flying friend!

Thank you very much András, I'm glad to know that you like how the model flies!
Yes !, you have to take time to measure and calvulate the F1 or parallamas, something that the engine is properly at the right angles for linear flight without trends.
I have manufactured the fitting pieces carefully, in order to minimize any deviation!

Regarding the engine, I have placed there in the video a 12x6 inch Master propeller, I am using 10% nitro Byron fuel, in its composition it has Synthetic and Ricin.
I still cannot find the exact point of optimal engine operation, it has a certain irregularity during the flight, I am assuming two things, the engine is very new and I must also adjust the needles as I get to know it.
The level of the fuel tank with respect to the carburetor has been slightly above, so I must check if that really affects it or it is simply a needle adjustment as I recently commented. I will continue with the progress and flights and keep you informed .... thanks again dear friend!

getback wrote:Nice !! she was at your command very smooth and looks good too !! Hope things are well with you and Merry Christmas my Friend !!  

Thank you dear Eric, I always remember YOU FRIEND! .... I wish you beautiful Christmas ... a big hug!

Okay, I made the rpm measurement with these two blades:
Master 12 x 6: High 9500 rpm - Low: 2300/2400 rpm
Master 13 x 6 S-2: High 10050 - Low: 2300/2400 rpm
then, I deduce that, due to the shape of the blade, it is much easier for the engine to move the 13 x 6 and as for the acceleration, it logically accelerates faster from low to high than with the 12 x 6 propeller.
Keep in mind then that there is no report error, I repeat, what is making the 12 x 6, have less reaction and less rpm than the 13 x 6, is undoubtedly the shape of the shovel.
I should measure, what drag power in kilos the engine can give with one or another propeller, but here it started to rain, so I leave it for another time ....

I have always used APC 12x6 on this engine and it has a bit narrower chord than the Master Airscrew so it revs up to 10.5k max with 20% nitro.