ORIGINAL: Sport_Pilot
The Fox .15 BBRC weights 6 ounces with muffler. The Enya III weigh's 6.5 ounces with muffler and that is with a venturi instead of a carb. As I recall most plain bearing .25's weigh about 8 ounces. Did you really think any Fox weighs a lot? Some weigh a lot for a Fox but not compared to the market.
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Can you still buy a new Fox .15BB? I thought they went out of production.
I never weighed my little Fox .15 BB when I owned it. I'm sure it weighs more than the TT .15 and most likely the new Enya .15's I mentioned. I could be wrong. No pissing contest from me.
I have a pristine condition Super Tigre G20/15 that I bought new in the seventies and one in not so pristine condition that was a gift from Bob Adkins. It is a beautiful little engine that was designed for FAI 1/4 Midget Pylon Racing. Mine ran good, but it was never anything special in power production. My HB .15 would cream it any day of the week in peak rpm figures with the same 7x4 prop.
I used to run 8x6 props on my ancient Fox .15X when flying control line. It always felt like it was too much prop, but that is what everyone in the magazines said to use. This was in 1962, when the .15X was a brand new product. I was all alone in my flying back then, with no one more knowledgeable to talk with.
Years later, when I discovered an R/C model named the "Peppermint Pattie", a mini pattern aircraft of sorts, I started reducing prop sizes and I was amazed at how much more thrust the little engines developed. Pattie used to blow right by the several .60 sized piped pattern ships at the field. I be smilin'.