09-06-2022, 11:44 PM
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Contest, Sport, it's all good......
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Join Date: Jul 2008
Location: West of Minneapolis, MN
Posts: 760
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Quote:
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Originally Posted by tdracer
Any idea how those motors have been stored?
When I became a BAR around 2001, I had a large collection of early 1970 vintage Estes motors. But they'd not been well stored - basically left in an unheated garage for most of the previous 30 years with lots of temperature and freeze/thaw cycles..
I flew a few of them as a BAR, but the failure rate was horrid - about 50% CATO rate (with more than one case rupture). I simply couldn't accept that sort of failure rate and ended up disposing of the rest.
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Big chance it was HUMIDITY from being stored in the garage for all that time. I know of a couple of examples where people had kept engines in damp basements for years, where nearly every engine fired had a cato. But the engines had not undergone temperature extremes.
As for 18mm MPC B3-3's, most of my early models were MPC (K-Mart way closer than a hobby shop at the time), and I used B3-3's in a number of MPC models, like the Moon Go. Flew fine, as those models were not all that heavy (largest diamter was 30mm).
Then, later, there were the MPC B3-3m's, the 13mm mini-motors 2.25" long. I used those for a lot of B powered contest gliders. |