Modern Engines with Fox 36 Mounting Pattern?

Help!! When Top Flite released its Flite Streak ARF, I purchased
a couple of "kits". I was really impressed with the light construction.

Since I had regularly flown Flite Streaks in the old days, I
mounted a trusty Fox 36 and headed for the field. I soon discovered
that I had a real "Shaker" on my hands.
A bit later, I assembled the 2nd "kit" and mounted an OS LA 25 on
it. What a difference. It is as smooth as silk.

Now my question. Does anyone out there, know of a light modern ABC engine with the same bolt mounting pattern as the old
Fox 36(or Enya 35, or ST G21 35 or Johnson 35)? I would certainly
like to mount such a low vibration engine on "kit" #1 and get some use out of it without having to adapt the engine mount.
Best wishes.

Robert Beck Clark

My advice is simply to adapt the mount. Use dowel material, slighty tapered and a bit oversized, to close the holes. Weep in thin CA to hold them. Sand off the excess.

There is an engine database out there somewhere, with lug dimensions. You can take a half dozen popular old baffle motors from the 50s and 60s, same for modern ABC Schneurles, and none match up exactly.

One nice thing, though...OS has retained the same hole pattern for their 35s and 40s over the years.

Thank you for taking the time to reply.

I had indeed planned to do the adaptation
as you have suggested, but before doing so,
I thought I would ask, just in case someone
was aware of a new engine with identical mounting
lugs.

Best wishes.

The Thunder Tiger 36 will fit Fox mounts, but it is a bit heavier than the stunt 35. Another modern engine that fits the same mounts is the Double Star 40.
Steve
The older I get, the better I used to fly!

LAST EDITED ON Apr-15-04 AT 08:02 PM (CDT)
 
AFAIK, the DS 40 is intended as a drop-in for the Fox Stunt 35 (I do not own any Double Star engines, can't back up that assertion). The stunt 35 has a narrower lower end and narrower spacing across the mounts than the later model Fox 35 four-bolt engines.

Only the earlier Rocket 35, and Series I & II Fox CS engines shared mounting patterns with the stunt 29/35. From the Series III and third Rocket (the one that shared case castings with a late model Series III) onward, the four bolt Foxes had the wider pattern. (I only have one Series III of my own, so can't tell directly if the change that affected the Rocket's mounts was simultaneous on the Series III. Perhaps the earlier III had the narrower pattern.)

When Magnum and Thunder Tiger were one and the same, the (bushing shaft GP) 36's shared a narrow mounting bolt pattern that was close enough to that of a Fox 35 that you could swap the engines. I have one each of the TT Pro 36 and Magnum XL 36 from their year 2000 versions (round shaped cylinders and cooling fins), and my Magnum doesn't seem to match my TT Pro in this regard. I am fairly certain that the Thunder Tiger shares mounting spacing with the BB-shaft 25 to 32 OS Maxes, making it "close enough" to a Fox.

P.S. I do have an ARF of the Streak, and it came with quite narrow engine spacing that was a drop-in for a Cox Conquest 15, but not for any other engine that I tested for fit. Not even the suggested LA 25 was a drop-in. I didn't try a complete range of 19 to 35 size engines, not even including a Fox 35. However, I would NOT simply cut away the existing mount material to allow a shaker-type engine to fit. There is only a token amount of hardwood available to cut away.

If there was any valid reason to match this ARF to that type engine, I STRONGLY recommend using a thicker version of the Larry Cunningham New Mexico Universal engine adapter! That way, there is less need to cut on the spacing width so radically.

Bob Reeves is hosting a couple of pages of CL data, including an early version of an engine dimensions spreadsheet, on his web site. I'll have to look it up, because he had to change the URL along the way and I'm pretty sure I do not have the newest address at hand.

(Later. OK, I have it now

http://www.eaglextra.com/ )

.

Kiwi

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Kiwi is correct in that the TT25/36 pro will fit in the Fox 35 mounting holes. Also the OS25/28/32 FSR series will fit.
If your into old time motors the Forster 29/35 will match holes also.
Again agreeing with Kiwi while the holes match the cases don't and you need to use a mounting pad to raise the motor up a tad or open the beams a little.
To the best of my knowledge the Fox 29/36 slant plug 4 bolt backplate is not a drop in for the old 35.
Dennis

Can't help with the 36 but I believe the Leo 37 will fit the same holes as a Fox 35. Of course it's 2 ounces heavier and will stick out further in the front than the Fox.