Re: And the guess whats hiding in there winner is..................................

rsv1cox Tue Jun 11, 2019 9:11 am

Hi Rod,

Grabbed the .29 Series 21 (top center left) to see if it would run. Installed one of the new Taiwan plugs and headed for the garage.

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Sticky from sitting, I gave it a spritz of Remoil and heated it slightly with a heat gun, seated the needle and ran it out four turns. Started right up with very little coxing achieving a high of about 1470 turns (that's X10 of course) on the tach swinging a 9/4 prop on 10% car fuel..

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Bad news is the first time I ran it it took out the glow plug. So much for Taiwan. Scrounged around and found a used plug and recorded the tach run with it. I might have found more RPM's if I had a third hand to adjust the needle.

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Mike1484 Tue Jun 11, 2019 3:00 pm

Those are good numbers for a sport engine on a 9/4 prop . I think people under rated those series of engines , for what they are and cost they are good engines. Try a 10/5 or 9/6 for sport flying and stunt C/L .

Mike1484

rsv1cox Tue Jun 11, 2019 4:56 pm

Mike1484 wrote:Those are good numbers for a sport engine on a 9/4 prop . I think people under rated those series of engines , for what they are and cost they are good engines. Try a 10/5 or 9/6 for sport flying and stunt C/L .

Mike1484

Thanks Mike,

I have tied myself in knots trying to explain myself if 14,700 rpm out of a Testors series 21 engine is a good number when compared to other engines of like displacement with similar parameters. But besides Rod I guess there are not many here that actually run these either on the bench or in a model.

One reason may be weight:

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Fox .35/Testors .29

It may be a paper weight, but it runs well and negates the need for nose weight. Smile

Great for long fuselages though.

Putting this thread to bed now as I'm way off track................

Oldenginerod Tue Jun 11, 2019 5:36 pm

Not time to shut it down just yet Bob. I expect to be back with some sort of report down the track. Just scored 6 X original Testors .19 gasket sets to suit for $3 USD plus a few$$ postage. Ebay listing was for two, but he felt generous. Says he still has more sets. I can't imagine getting too many respond here, but if someone needs gaskets?????? I will have extra Thumbs Up

NEW222 Tue Jun 11, 2019 7:40 pm

Sorry I cannot be of any real help here, but that looks like one tank of an engine. Are they as solid as they look, or are they rather fragile? However, a neat design. Thanks for sharing.

Oldenginerod Tue Jun 11, 2019 7:41 pm

The one thing about recuperation, you have time on your hands (sort of).
Following our discussions on the Testors .19, I decided to look more closely at the bag of unidentified parts Bob sent me. One particular item caught my eye.

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Clearly a piston & rod from a small twin. Rod is offset to one side. Outer side is "rounded" to clear the piston skirt. Big-End is flat and thin, presumedly to allow for a shared crank pin. You can see the offset small-end on the broken rod.

So here's the challenge. What's it out of? 15mm or 5/8" diameter piston (measured with a ruler only).
(No prizes, except of you want the piston Laughing

)

Oldenginerod Tue Jun 11, 2019 7:47 pm

NEW222 wrote:Sorry I cannot be of any real help here, but that looks like one tank of an engine. Are they as solid as they look, or are they rather fragile? However, a neat design. Thanks for sharing.

Yes, pretty robust (read-heavy). Fragile? No! They run a Dykes ring and brass bushings, so none of the durability problems their predecessor had (McCoy Red Head). Good runners, average output. VERY LOUD
With some milling skills and about 3-4 grams removed from the case and prop driver, they'd make a good stunt engine (I think!).

rsv1cox Wed Jun 12, 2019 7:03 am

Wish I could help Rod. I just spent some time looking through all my old photos for those parts hoping for a clue.

I think they were in a bunch of parts that my son found at a Virginia antique shop but I'm not sure. Thought maybe a picture showed them with an engine.

Still looking - Bob

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