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Engine basics => Engine set up tips => Topic started by: frank mccune on September 05, 2016, 07:29:17 AM

Title: McCoy .35 vs. Brodak .25 swap?
Post by: frank mccune on September 05, 2016, 07:29:17 AM

       Hello:

       Is it worth the time and hassle to replace McCoy .35 RH Stunt engines with a Brodak .25? The planes in question are the CG Shoestring and the Sterling F-51 Mustang.

       I posted this question in the Classified Section for some reason and got very little response. Lol


                                                                                                                               Tia,

                                                                                                                               Frank McCune

Title: Re: McCoy .35 vs. Brodak .25 swap?
Post by: Paul Smith on September 05, 2016, 09:48:15 AM

It would be well worth your trouble to switch to an OS 25.  You could try the Brodak first, then switch to the OS.

Title: Re: McCoy .35 vs. Brodak .25 swap?
Post by: David Ruff on September 07, 2016, 05:36:02 PM

LOL. 

I am running an OS 25 in an Oriental.  It is light.  I cut off the rear NVA ala Phil Cartier and will run a front NVA setup.

Title: Re: McCoy .35 vs. Brodak .25 swap?
Post by: Phil Krankowski on September 07, 2016, 06:28:40 PM

Seeing that the McCoy and the OS are very different mounting dimensions, and I understand the Brodak shares the dimensions of the OS...  The exchange will be less than trivial.

Do you have plans for accommodating the difference in dimensions?  The McCoy is quite a bit wider.

Phil

Title: Re: McCoy .35 vs. Brodak .25 swap?
Post by: frank mccune on September 08, 2016, 09:06:13 AM

    Hi Phil:

    Thanks for the reality check! Why go through so much work for so little possible gain?

    I have not tried the McCoys yet but I have run the Brodak and it is a great running engine.  What I was looking to gain, easier starting and less weight.  I would save about 1.5 oz. with the Brodak which may allow me to avoid using very little tail weight if any.  The F-51 is quite a small plane so less engine weight would be great.  I have a couple of kits for the F-51 so perhaps an old ST G20/.23 would be a good choice for those kits.

                                                                                                                   Thanks for the replies,

                                                                                                                   Frank McCune