Prop shaft extension, with bearing! Set-up?
12-03-2011, 08:09 PM
#1
Thread Starter
Prop shaft extension, with bearing! Set-up?
I'm mounting an engine well behind the spinner, some 7" possibly 9"
To opperate the prop, I need an extension shaft. However, it has to ride on a bearing and have a thrust washer and nut.
This set-up is new to me, nut I know it can be done.
Does anyone have experience in this area? Know someone who may? Machinist, modeler friendly.
I was thinking boat parts. I actually posted there.
Can you help?
Charles
To opperate the prop, I need an extension shaft. However, it has to ride on a bearing and have a thrust washer and nut.
This set-up is new to me, nut I know it can be done.
Does anyone have experience in this area? Know someone who may? Machinist, modeler friendly.
I was thinking boat parts. I actually posted there.
Can you help?
Charles
12-04-2011, 05:10 AM
#2
RE: Prop shaft extension, with bearing! Set-up?
Charles first off what size engine are we talking about, in my previous model
boat racing days we used 1/4" shafts in needle bearings, "old school", using
up to 90 sized engines and also on the gas boats with 23cc engines. You would
have to have some kind of u-joint in the connection to the engine unless it was
set up in a rigid rail system so that the shaft could be connected directly to the
engine you are using. Another problem you might encure is lubrication of the
bearings unless you could come up with "sealed high speed" bearings. The shaft
would have to be made from high speed tool steel for toughness and duribilty,
it would have to be machined after anealing to cut threads into the prop end and
then re-hardened again. You may have a cooling issue with the engine also.
I have been toying with the idea for several years of a mid-engined P-39 or P-63
driving a shaft from the scale engine position via a cogged belt drive to the shaft,
or even a drirect drive shaft like the set up you are trying to achieve but like all
things cost verses practicality moves it to the back-burner every time. Not saying
it can't be done but will it be worth the project cost wise?
It would have been very interesting for the hobby industry if some like Byron Godbersen
would have decided to tackle a P-39 or P-63 for a mid-engined set up modifying his
Byro-drive system.................
Bill D.
boat racing days we used 1/4" shafts in needle bearings, "old school", using
up to 90 sized engines and also on the gas boats with 23cc engines. You would
have to have some kind of u-joint in the connection to the engine unless it was
set up in a rigid rail system so that the shaft could be connected directly to the
engine you are using. Another problem you might encure is lubrication of the
bearings unless you could come up with "sealed high speed" bearings. The shaft
would have to be made from high speed tool steel for toughness and duribilty,
it would have to be machined after anealing to cut threads into the prop end and
then re-hardened again. You may have a cooling issue with the engine also.
I have been toying with the idea for several years of a mid-engined P-39 or P-63
driving a shaft from the scale engine position via a cogged belt drive to the shaft,
or even a drirect drive shaft like the set up you are trying to achieve but like all
things cost verses practicality moves it to the back-burner every time. Not saying
it can't be done but will it be worth the project cost wise?
It would have been very interesting for the hobby industry if some like Byron Godbersen
would have decided to tackle a P-39 or P-63 for a mid-engined set up modifying his
Byro-drive system.................
Bill D.
12-04-2011, 09:53 AM
#3
Senior Member
RE: Prop shaft extension, with bearing! Set-up?
Lew Pancoast did this for his Keith Rider 'Firecracker'. He has drawn a few plans. Another of his was a Spartan Executive. If he is still 'out there' I have no idea. He used a universal joint near engine end and the prop shaft bearing end was captured by pillow blocks. Lubrication of bearings... no idea. A separate thrust bearing was not needed because the engine already has one!
12-04-2011, 11:01 AM
#4
RE: Prop shaft extension, with bearing! Set-up?
The best way I have seen was the smartest hence not my idea. Use a dead engine to be the prop drive. Crankcase, bearings and crankshaft and prop hub mounted to the front just like a regular engine;just lop off the cylinder. U-joint drive shaft to the running engine. You are going to have to machine stuff no matter what, but the dummy crankcase is already ready for the loads.
12-04-2011, 01:17 PM
#5
RE: Prop shaft extension, with bearing! Set-up?
