McCoy 5” from 1958

The Mccoy engines of this era are great schoolyard free flight engines. They have little power. The glow plug in that engine is non existent so once it's burned out, it can be problematic finding another and when you do it costs more than the engine. Use caution with using nitro with these. The cranks were fragile when new and it doesn't get stronger with age. Keep the nitro levels lower than your average 1/2A engine. Run full castor as the fits of these can also be excessive. The construction of these engines are very similar to the other post in regards to the Atwood Wasp.

Hi Mark, I checked my McCoy photo archives.. and found some info. on what "looks like" what you have there.. but no direct reference to it being called a "Five". It may have been produced in 1955.. which might be the reason.

Below is a photo from CEF member Mark Boesen..





It looks a lot like the engine shown below.. except for the radial mount.

Ok Ken. Thanks for that. I bought it out of curiosity but I do intend to run it on my test stand and see what kind of rpm I get. I’m assuming that the 5” designation is perhaps for a 5 inch prop but I’m not sure

Ok thanks so Much Roddie. Very in depth. That’s what I need. Seems like every new engine I get needs a different fuel

Greenman38633 wrote:Ok thanks so Much Roddie.  Very in depth.  That’s what I need.  Seems like every new engine I get needs a different fuel

You're welcome Mark. Keep a good supply ( at least a quart) of castor oil on hand.. and some small (1/2 pint) plastic bottles with screw-on caps for custom-blending your fuel for bench-runs.

Castor oil is your "old engine's" friend. Synthetic oil wasn't around when they were manufactured. Adding castor to your modern glow-fuels will both; lessen the percentage of nitro.. and increase the percentage of oil.. helping to better lubricate.

Speaking of adding oil to my fuel is there a chart that will help me figure out how much to put in? Thanks in advance. Mark