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Testors Engine Propeller
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Testors Engine Propeller
Hi all. So, I recently came to aquire a Testors 8000 series engine. However, the main shaft is larger than that of a Cox engine. What propellers does one use, or is it safe to drill out a Cox or Master Airscrew propeller? Thanks in advance.
NEW222- Top Poster
- Posts : 3046
Join date : 2011-08-13
Age : 42
Location : oakbank, mb
Re: Testors Engine Propeller
For my Testors engines I just drill out the hole on a Cox 5x3 safety prop. I make sure to mark the props with "WM" for Wen-Mac, since they're the same as a Testors. Works fine for me.
The Marked Mark
The Marked Mark
batjac- Diamond Member
Posts : 1918
Join date : 2013-05-22
Age : 57
Location : Portland, OR, USA
Re: Testors Engine Propeller
Thank you.
NEW222- Top Poster
- Posts : 3046
Join date : 2011-08-13
Age : 42
Location : oakbank, mb
Re: Testors Engine Propeller
batjac wrote:For my Testors engines I just drill out the hole on a Cox 5x3 safety prop. I make sure to mark the props with "WM" for Wen-Mac, since they're the same as a Testors. Works fine for me.
The Marked Mark
Yep. That's what I did on this Testors Albatross, when the original prop got broken in a botched hand launch\crash.

TLAnderson- Gold Member
- Posts : 198
Join date : 2016-07-21
Location : Northern Wisconsin
Re: Testors Engine Propeller
I recall Bernie had quite a few original Testors props in stock some time back. Not sure if he still has any.
Oldenginerod- Top Poster
- Posts : 3233
Join date : 2012-06-15
Age : 58
Location : Victoria, Australia
Re: Testors Engine Propeller
Chancey, The Testors .049 engines have a 6-32 threaded crankshaft which measures .161" diameter. A #20 (decimal/inch) machinist-drill has a .161" diameter.
Alternately.. a 4.1mm metric drill has a .1614" diameter.. and would also be a good choice.
Either of these drill-sizes are what you'd want to use to enlarge a propeller's hub-hole to fit your Testors .049 engine.
Don't drill the hole oversize.. or else you'll likely have a propeller that's off-center and out-of-balance after it's mounted.
Don't re-use the propeller on a Cox .049 engine once it's been drilled-out to fit the Testors engine's 6-32 shaft. Keep the propellers separate.. and marked for the engines that they fit. The Cox .049's 5-40 prop-screw is .039" smaller in diameter than the 6-32 size.
Alternately.. a 4.1mm metric drill has a .1614" diameter.. and would also be a good choice.
Either of these drill-sizes are what you'd want to use to enlarge a propeller's hub-hole to fit your Testors .049 engine.
Don't drill the hole oversize.. or else you'll likely have a propeller that's off-center and out-of-balance after it's mounted.
Don't re-use the propeller on a Cox .049 engine once it's been drilled-out to fit the Testors engine's 6-32 shaft. Keep the propellers separate.. and marked for the engines that they fit. The Cox .049's 5-40 prop-screw is .039" smaller in diameter than the 6-32 size.
Re: Testors Engine Propeller
Oldenginerod wrote:I recall Bernie had quite a few original Testors props in stock some time back. Not sure if he still has any.
No longer shows on-line, my guess is he finally sold out.
GallopingGhostler- Diamond Member
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Join date : 2013-07-13
Age : 66
Location : Clovis, Nuevo México
Re: Testors Engine Propeller
Thanks roddie for all the information. I am glad I now know the size of the shaft as well. I do have those drill bits available to me to use also, so I will give it a go. Thank you.
NEW222- Top Poster
- Posts : 3046
Join date : 2011-08-13
Age : 42
Location : oakbank, mb
Re: Testors Engine Propeller
NEW222 wrote:Thanks roddie for all the information. I am glad I now know the size of the shaft as well. I do have those drill bits available to me to use also, so I will give it a go. Thank you.
Hey Chancey.. you're welcome my friend. It's imperative to keep precision measurements with model-aircraft applications.
Re: Testors Engine Propeller
Sorry but just saw this post:
https://www.ebay.com/itm/7824-Vintage-Testors-Model-Airplane-Prop-2-Blade-6-Propeller/371977064889?epid=22002738548&hash=item569b8f91b9:g:uAAAAOSwR2RaKs~8
https://www.ebay.com/itm/4100-5016-Vintage-Testors-Model-Airplane-Prop-2-Blade-4-1-2-Propeller/371977109433?hash=item569b903fb9:g:ptYAAOSwX3FaA4Xv
https://www.ebay.com/itm/7824-Vintage-Testors-Model-Airplane-Prop-2-Blade-6-Propeller/371977064889?epid=22002738548&hash=item569b8f91b9:g:uAAAAOSwR2RaKs~8
https://www.ebay.com/itm/4100-5016-Vintage-Testors-Model-Airplane-Prop-2-Blade-4-1-2-Propeller/371977109433?hash=item569b903fb9:g:ptYAAOSwX3FaA4Xv
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