Hello All:

     I "found" two O.S engines that I may use to power my "new" Fancherized Twister.  In my bag of engines, I found an N.O.S. O.S. .40 S.  This is the 1970's O.S. That has the single rear ball bearing and a baffle on the piston.   The other engine is a new O.S. LA .40.  Since the plane has been drilled and tanked for either engine, which engine would be the better choice?

    When I built thjis plane about 30 years ago, I had planned upon an O.S. .35 Stunt for motivatiion.  Would the .35 be a better choice than a .40 due to its lighter weight?  Would it have ample power?

                                                                                                                                     Tia,

                                                                                                                                     Frank

I have never had much joy with the LA40 compared to the LA46. The LA46 is almost idiot proof while the LA40 isn't. I have seen one excellent running LA40, but it isn't too common.

Andrew.

have an Dee Rice oriental with an os la 40 on it used a venturi mounted needle instead of the remote one, and this airplane is very smooth and consistant running has plenty of power .

     Hello Richard:

     The O.S. .40 S is a stunt from the 70's.  It has the regular venturi and spraybar and was not a converted RC engine.  It also has a single ball bearing in the rear and a bronze bearing in the front.  I think that the timing was a bit less wild than the .40H which was a RC engine.  It also has a single ring with a baffled piston.  It seems to run very well!  I have it in a Green Box Nobler as we speak. I have not flew it yet but I will soon.

                                                                                                               Thanks for all of the replies,

                                                                                                               Frank