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I have what looks like unrun .15R. A little stiff from non use but great compression. Where these used way back when for FF? Engine came from a Meca member with exrta parts. One fin on front bottom case was bent and I tried to fix but it chipped away. Spinner is uncut and sign this was not run or used anyway. Any input as to useage in FF would be helpful.
It is complete with pressure fitting and speed venturi etc. Maybe a trade for something? Regards,DanHi Dan
My father when he was seriously competiting in F1C in the 60’s and early 70’s used said engine (until replaced by the Super Tigre G15) in an Ed Miller Texan. Apart from collector value, I don’t believe to qualifies for any event I know of, then again I could be wrong. Dad still has the engine in his box of memorabilia (? spelling) while the Super Tig’ is in an R/C Frisco Kid, sport model! 😆Pete
I’m assuming that the 15R that you have is either the Series 61 or 64 Torpedo 15 loop-scavenged engine. K&B made a Schnuerle-ported 15 after this engine and took of the production of the Cox Conquest as well.
Assuming yours is a 61/64 15R, it wa a good FF/CL speed engine for its era and was a favorite of many a speed merchant. I will make a good FF engine as it is if all you expect is mid-1960 performance wher it was one of the top engines of choice. If you want to get to mid-1980 performance 2.5cc level, you will need to do some major modifications to the liner/piston and head.
Since you broke the web on the case front, you have a flier and not acollector, so you might as well take so time and break it in properly and fly it – it’s a great running little engine.
Ron Bennett
Monmouth, ORRon,Pete, thanks for input. This will gine me another 2.5cc engine for FF. I have the .15S wart engine too. This was schrurle ported engine. Time for some of these to earn their keep. Maybe get a Slow Worm for it. Cheers,Dan
>I will make a good FF engine as it is if all you expect is mid-1960 performance
Not necessarily so; match the available power to a model of suitable size and weight and it will do very well today in Classic Gas or even A Gas. I’d suggest a clean airframe, flatbottom wing about 420-450 sq.ins and an a/u weight around 13-14 ounces, and it will please you….. maybe surprise you.
A great many ‘outdated’ engines lie unused these days, which can give very satisfactory service.
@dankar wrote:
I have what looks like unrun .15R. A little stiff from non use but great compression. Where these used way back when for FF? Engine came from a Meca member with exrta parts. One fin on front bottom case was bent and I tried to fix but it chipped away. Spinner is uncut and sign this was not run or used anyway. Any input as to useage in FF would be helpful.
It is complete with pressure fitting and speed venturi etc. Maybe a trade for something? Regards,DanIn either case, if this is a series 61 or series 64, it may need the better front and rear ball bearing sets that were available from Fafner via Berry Bearing at the time. The original bearings were often replaced with the Higher Speed bearing sets since the originals often crapped out on CL speed models.
I had one of the original Series 61 .35 Combat specials and it had a problem with the original set screw that held the prop washer to the front shaft. The front shaft had a small flat to engage the allen screw to the shaft. Tried the engine for CL RatRace, but the allen screw kept slipping. Others in our group had the often had the same problem until one of the guys did some machine work on the front drive assemble.
One of the first engines that need no crankcase gaskets. As I recall it used an aluminum washer for a head gasket.
Only the engines modified by Bill Wisnewski the designer, and his budies ever were able to make this series 61 .15 engine work well. The series 64 had the Wisnewski improvments. I think this was when Bill started to use the “Pent-Oxide” fuel that was mixed on site and had to be used within minutes of mixing. This fuel additive is now banned by FAI and AMA. Very Toxic.
This happens to be one of my most favoritist (like that, huh??) engines. It just looked fast and ran well also. The series 64 had the wider bypass (the top of the bypass is substantially larger that the bottom) along with internal changes. I used a modified Cox .15 plug in it. If I remember right, I used the cox grey prop on it in FAI (a 7 x 3.5) while many used the Rev-up 7 1/2 x 3 3/4 prop.
It will work fine on many light models, with some nitro (35% or so) thrown at it. I would run a fiberglass 7 x 3 prop or so on it. I would think a good example will turn 23K or so on it.
I just think these things look cool, even if they aren’t the fastest any more. I like the satin finish and if you can get the FAI special, it has a machined head for it that runs better than the stock head, especially on 80-20 (no nitro)…
Run it and have fun with it!!
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