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General control line discussion => Open Forum => Topic started by: BOB ALLAN on November 06, 2010, 03:03:41 AM

Title: A good stunt engine ?
Post by: BOB ALLAN on November 06, 2010, 03:03:41 AM
Back in 1957, Duke Fox released a couple of new engines with 4 bolt backplates - one was / is the well known 35 Combat Special. The other one, now lost in obscurity, was the 35 R.C. Special, which was similar to the CS but with modified timing to enable it to turn big props by increasing torque at low revs.  According to the Engine Test in MAN Oct. 1958, the 35 R.C. Special ran out of breath at 12,500 RPM, and was fitted with a special head for low speed running. Was there enough difference in the two engines to make the Fox 35 R.C. Special a candidate for stunt ? BOB
Title: Re: A good stunt engine ?
Post by: BOB ALLAN on November 06, 2010, 06:05:37 PM
Here is a photo of the engine in question. On paper at least, it should have made a reasonable stunt engine.
Title: Re: A good stunt engine ?
Post by: Randy Ryan on November 06, 2010, 06:54:46 PM
Well Bob, there's one way to find out, try it. I remember this engine but I never had one.
Title: Re: A good stunt engine ?
Post by: EddyR on November 06, 2010, 08:48:47 PM
Bob I have had several of that model. Some had the combat sleeve in them and some had the standard Fox stunt sleeve in them. They ran just like a standard Fox 35 stunt
Ed #^
Title: Re: A good stunt engine ?
Post by: john e. holliday on November 07, 2010, 07:11:12 AM
Looks like the series of Fox Rockets.  Remember to break it in properly.   H^^
Title: Re: A good stunt engine ?
Post by: George on November 07, 2010, 08:41:29 AM
Here is a photo of the engine in question. On paper at least, it should have made a reasonable stunt engine.
Bob,
That was a time when a "throttle" was usually accomplished by a two needle setup or an exhaust baffle. I see yours has both.

If you use it for CL, you will have to get used to choking by using three fingers over the intake... or use something like JB Weld in the extra holes.

George

Edit: Oops! On second look, I see that the upper holes in the intake are not fully drilled. Sorry, my bad.
Title: Re: A good stunt engine ?
Post by: Dick Pacini on November 07, 2010, 09:01:25 AM
That exhaust clapper doesn't even look like it will fit.
Title: Re: A good stunt engine ?
Post by: BOB ALLAN on November 07, 2010, 03:15:00 PM
Dick, I hadn't planned on using the exhaust thingy,but here's a photo of it on the engine as well as a look down the venturi with 1/4 inch insert.
Title: Re: A good stunt engine ?
Post by: BOB ALLAN on November 07, 2010, 03:19:15 PM
Take two!
Title: Re: A good stunt engine ?
Post by: Dick Pacini on November 07, 2010, 04:36:15 PM
I was fooled by the lack of visible tapped holes for the clapper to attach to the exhaust stack.  Apparently, they are inside and not visible in the first pic.
Title: Re: A good stunt engine ?
Post by: Bill Mohrbacher on November 08, 2010, 08:01:38 AM
Here's the ad for those engines.  Although they advertised a 25, 29, and 59, all anyone's every seen are the 19 and 35.  Also, the venturi clapper shown in the artwork was added by many flyers, but not sold from the factory.
Title: Re: A good stunt engine ?
Post by: john e. holliday on November 08, 2010, 09:09:52 AM
I remember my first throttle controlled Fox .35 or 36.  It had a carb linked to a slie in the exhaust stack.  It slid up and down vertically.  First contest was El Dorado KANSAS at a circle down town park.  It had enough power to get off the deck.  But when slowed down there was only about 25 mph differece.  Still  wish I had it as it would be a collectors item now.  I think I had the only one in the KC area. H^^