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HOB Messerschmidt 109..propping Cox .051 R/C

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Old 03-19-2013, 07:18 PM
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Steve Westphal
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Default HOB Messerschmidt 109..propping Cox .051 R/C

My brother and are finishing an HOB ME109 and we are putting our Cox .051 r/c motor on it. The engine is a screamer and I know it will fly the plane but I would like a recommendation for a prop. I love to use balanced wood props but don't know what the ideal prop size would be in this application. Thanks.
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Old 03-19-2013, 10:42 PM
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Default RE: HOB Messerschmidt 109..propping Cox .051 R/C

What engine is it, a .05RC?
The APC 5.7x3 is a good load for the engine and you can go down to a cox 5x3 also.
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Old 03-20-2013, 06:27 AM
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Default RE: HOB Messerschmidt 109..propping Cox .051 R/C

For 1/2A engines it is always best to use the prop recommended for the engine, regardless of the type of plane it is powering. You will get the best thrust without harm to the engine. If you want to slow the engine down, use an exhaust throttle.
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Old 03-20-2013, 07:51 AM
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Default RE: HOB Messerschmidt 109..propping Cox .051 R/C

If it is the .05 with the carb, this engine will work well with a 6X3. This prop will allow the engine to throttle real good and the prop will pull the plane well. Save the 5 inch props for a blink.
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Old 03-20-2013, 03:25 PM
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Default RE: HOB Messerschmidt 109..propping Cox .051 R/C


Quote:
ORIGINAL: skyhawkjock

For 1/2A engines it is always best to use the prop recommended for the engine, regardless of the type of plane it is powering. You will get the best thrust without harm to the engine. If you want to slow the engine down, use an exhaust throttle.
It has a carb on it not a throttle ring...Id go 6x3 myself
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Old 03-20-2013, 04:31 PM
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Default RE: HOB Messerschmidt 109..propping Cox .051 R/C

A 6x3 at 16,000 puts out 1 pound of thrust.....

A 5x3 at 20,000 puts out about 12 ozs.

Neither prop will give that plane much more then 60 mph. Tailor your choice to suit your plane's weight / drag and your flying style.

The APC 5.7x3 is a very good prop for planes like this. It makes the needle setting less critical than a 6x3 from full tank to empty.

Just try all 3 props and decide for yourself...just beware that the 5x3 wont hand launch an overweight plane as well as a 6x3 would.
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Old 03-20-2013, 07:33 PM
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Default RE: HOB Messerschmidt 109..propping Cox .051 R/C

I tend to choose a prop that fits the plane, then put a motor behind the prop that will spin it. In this case you have a motor that will do fine with a 5X3 to a 6X3, So I'm with CP on this one. Try all 3. That being said, I find warbirds, or anything with a high wing loading need thrust more than speed, but you need enough speed to keep it airborne. My gut says the 5.7X3 is the ticket.
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Old 03-23-2013, 06:04 PM
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Default RE: HOB Messerschmidt 109..propping Cox .051 R/C

No one asked but Exactly How? heavy is your HoB 109 Build ready to fly ?.
These used to be all over the map weight wise... back then:-) Some went well on a TD 051 while others needed a 'good' TD 09 to work..

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