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Testors 049

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Help! Testors 049

Post  SkyStreak on Tue Jun 19, 2018 2:33 pm

Can anyone tell me if the cyl and head from a "pipebomb" testors engine will interchange with the Mcoy 049?
I seem to have misplaced my Mcoy 049 or I would check for myself.
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Help! Re: Testors 049

Post  Marleysky on Tue Jun 19, 2018 3:05 pm

SkyStreak wrote:Can anyone tell me if the cyl and head from a "pipebomb" testors engine will interchange with the Mcoy 049?
I seem to have misplaced my Mcoy 049 or I would check for myself.

Yup, they do. If yours look like these:


Sometimes the crank has the pin in a different position, but if you are just swapping p/c should be
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Help! Re: Testors 049

Post  Mark Boesen on Wed Jun 20, 2018 8:56 am

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Help! Re: Testors 049

Post  GallopingGhostler on Wed Jun 20, 2018 12:31 pm

Mark Boesen wrote:

Back in 1966, as a 12 YO, I saw one of those M-80's go off. They were indeed more powerful than a cherry bomb.  Shocked But as a 12 YO on a meager allowance, I purchased a half dozen cherry bombs instead. Still, they were definitely more powerful than a standard firecracker. Later in life, mischievous boys at my rural high school in Hawaii would flush cherry bombs down the toilet, blowing out the sidewall of it. (I graduated from a rough high school. Doh! )

As the last .049 that Testor made, according to Peter Chinn, the 8000 series reed valve engine, from which their RTF "pipe bomb" engine is based on, was definitely a hot one. Shocked

Sceptre Flight Model Engine Tests: Testor 8000 (2)

Peter Chinn wrote:Compared with the engine that it has replaced (the Testor McCoy 049), the 8000 was found to be considerably more powerful, with a maximum torque of 6.0 oz. in. at 11,000 rpm and a gross bhp (less silencer) of .094 at 18,000. This is very good indeed for what is basically a sport type reed-valve 049. In terms of prop speeds, the engine turned its own 5-1/2x3-1/2 Testor at 14,200 rpm. Other figures included 13,400 on a 6x4 Top Flite nylon, 13,900 on a 5-1/2x4 Cox grey nylon, 14,800 on a 6x3 Tornado nylon, 15,200 on a 6x3 Cox grey nylon, 15,700 on a 6x3 Top Flite nylon and 16,300 on a 5-1/4x4 Top Flite nylon.

Result was obtained on 15% nitro content fuel. Contrast this with the Cox .049 Black Widow:

Sceptre Flight Model Engine Tests: Cox Black Widow

Peter Chinn wrote:The Black Widow is intended for operation on fuels of a medium nitro rating - i.e. about 15 percent nitromethane. Using such a fuel, our test motor recorded a maximum torque of just over 6 oz.in. at around 9,000 r.p.m. and a peak output of nearly .08 b.h.p. at between 15,000 and 15,550 r.p.m. These are quite good figures for a 'sport' type .049 and are reflected in some useful prop speeds on various props.
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Help! Re: Testors 049

Post  ticomareado on Thu Jun 21, 2018 11:38 am

Not only is top end interchangeable, needle valve (although a bit stumpy) works in any Wen_Mac or Testor-Mac FRV. and Rotomatic starter parts are interchangeable will all late version Testor-Mac FRVs. Springs can be made to work in anything. And if you do machine shop work, you can also do some cool experiments on re-timing and re-porting the solid un-relieved crankshafts found in many of the pipe bombs for use in FRV Testor-Macs and Men Macs. You will find all kinds of strange crankshafts in these pipe bombs though if you tear down enough of them. I've found at least four or five permutations of crankshafts so far.
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Help! Re: Testors 049

Post  faif2d on Sat Jul 14, 2018 11:49 am

I think that Wild Bill Netzband had a hand in the design. He was VERY smart and a nice guy as well.
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Help! Re: Testors 049

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