Tom Lay OS 35S

[David_Ruff]

What would be a max size ship (weight/square in) for the Tom Lay OS 35S?
I assume it makes more power than the stock engine or a Fox 35 Stunt.

[Dennis Toth]

Dave,
The main advantage of the OS over the Fox is cooling fin area. The Fox is very light and Fox did that by keeping the case as small as possible which reduced the fin area. The OS can take more load (i.e. bigger prop, wider blades) than the Fox giving more pulling power. But it weights more so there is a trade-off. Generally, the Fox performs best below 42oz ish and the OS can get to maybe 45 - 47oz. There have been lots of heaver ships flow with both but if there is any significant wind they struggle at the higher weights.

Best,    DennisT

[Trostle]

The Tom Lay OS 35S stunt will have the performance of most good .40's.  When I was flying one of my Chizler's with the Tom Lay engine, I was asked several times if the engine was a ST .46.  True story!

Keith

[Dan McEntee]

What would be a max size ship (weight/square in) for the Tom Lay OS 35S?
I assume it makes more power than the stock engine or a Fox 35 Stunt.

     If you have a Tom Lay OS.35S, you really have something there. Tom's engines were mainly "reworked" by properly fitting all key parts, heat treating parts that required it, and on the connecting rod on the .35s it probably has a different rod or bushings installed and the rod heat treated to wear better. It will require the same castor based fuel that a stock OS and Fox.35 require. Stock OS .35s engines run quite well on their own but the rod can wear out prematurely if you don't feed it the right fuel. After market rods can be found out there. Fox.35s have been discussed at great length already, but if you want to see what a stock engine can do search out the video I posted over in the engine section recently . You have to learn how to properly run and choose the prop for ANY engine /airplane combination. The nest way to do that is to fly them. All props are not the same, just as all engines are not the same. When you install the T&L engine in something, take the time to test fly different props to get the most out of it. The same could be said of the stock OS and the Fox.35
   Type at you later,
    Dan McEntee

[David_Ruff]

Thanks all.  I picked the engine up from Ty.  I need to put it on a test stand and check it out.

[Dan McEntee]

Thanks all.  I picked the engine up from Ty.  I need to put it on a test stand and check it out.

   That's a good idea. If the T&L needs any break in, use a 10-4 or 10-5 prop for bench running. Then do the same with thFox.35 and the stock  OS.35s if you have one. Even on the bench I think you will see, feel and hear the difference.
  Type at you later,
   Dan McEntee