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rowedenny
Joined: 09 Mar 2008
Posts: 338
Location: Western PA
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 Posted: Fri Mar 07, 2014 3:52 pm Post subject: VW belt drive prop settings |
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Calling all VW Kolb drivers with the belt drives!
My friend Roger Sell is nearing completion of his Xtra and needs an educated guess on where to set his prop pitch to be in the right neighborhood.
He has a Great Planes engine and a 1.6 to 1 Valley engineering redrive with a 72 inch Powerfin F three blade prop. I think they say the engine is 100hp?" Any suggestions on where he should start with his blade pitch would be appreciated. I'm figuring 12 degrees for starters, idk?
Dennis "Skid" Rowe
Mk3, 690L-70, Leechburg, PA
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neilsenrm(at)gmail.com
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| Posted: Fri Mar 07, 2014 6:56 pm Post subject: VW belt drive prop settings |
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Dennis
I have the some prop cut down to 71 inches. I did this to try to get more power in climb. Its very good but you will always want more..... it didn't help Well 12 degrees would be a good starting point (I don't know what my pitch is I use the feeler gage thing but I don't remember what my settings are) but it really depends on how hard you want to run the engine. I find that 3200 RPM at app 60% power and 75 MPH works well for me. It is a real trial and error thing. I see 3400-3500 RPM on climb out at 60 MPH at 100%. Tie the plane down and shoot for about 3400 RPM static and you will be fairly close. Be very careful not to run at full power very long on the ground. Watch your CHTs and don't go over 375 degrees even if you have to power back a bit in the air. You can run a bit rich (to cool the engine) as long as you don't foul the plugs by going too rich. I would run on the rich side early on to protect the new engine. The valves are the weak if you get them too hot. Also I run my redrive belts loose to get things to run smooth. You will notice the engine RPM surging if you get too loose. If so power back a bit till it holds a steady RPM or you will burn the belts. I figure my engine as having 80 HP.
Good luck and have fun.
Rick Neilsen
Redrive VW Powered MKIIIC
On Fri, Mar 7, 2014 at 6:52 PM, Dennis Rowe <rowedenny(at)windstream.net (rowedenny(at)windstream.net)> wrote:
[quote]--> Kolb-List message posted by: Dennis Rowe <rowedenny(at)windstream.net (rowedenny(at)windstream.net)>
Calling all VW Kolb drivers with the belt drives!
My friend Roger Sell is nearing completion of his Xtra and needs an educated guess on where to set his prop pitch to be in the right neighborhood.
He has a Great Planes engine and a 1.6 to 1 Valley engineering redrive with a 72 inch Powerfin F three blade prop. I think they say the engine is 100hp?" Any suggestions on where he should start with his blade pitch would be appreciated. I'm figuring 12 degrees for starters, idk?
Dennis "Skid" Rowe
Mk3, 690L-70, Leechburg, PA
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rowedenny
Joined: 09 Mar 2008
Posts: 338
Location: Western PA
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| Posted: Fri Mar 07, 2014 8:18 pm Post subject: VW belt drive prop settings |
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Thanks Rick, that's what he's looking for. I think we'll be test flying his bird sometime this summer so this will be a great help. I still run a Powerfin and will continue to run it when I swap engines this Spring, been using Dave Lewis's Warp Drive protractor the last couple years and won't go back to the pins and feeler gauges.
Dennis "Skid" Rowe
Mk3, 690L-70, Leechburg, PA
[quote] On Mar 7, 2014, at 9:56 PM, Rick Neilsen <neilsenrm(at)gmail.com> wrote:
Dennis
I have the some prop cut down to 71 inches. I did this to try to get more power in climb. Its very good but you will always want more..... it didn't help Well 12 degrees would be a good starting point (I don't know what my pitch is I use the feeler gage thing but I don't remember what my settings are) but it really depends on how hard you want to run the engine. I find that 3200 RPM at app 60% power and 75 MPH works well for me. It is a real trial and error thing. I see 3400-3500 RPM on climb out at 60 MPH at 100%. Tie the plane down and shoot for about 3400 RPM static and you will be fairly close. Be very careful not to run at full power very long on the ground. Watch your CHTs and don't go over 375 degrees even if you have to power back a bit in the air. You can run a bit rich (to cool the engine) as long as you don't foul the plugs by going too rich. I would run on the rich side early on to protect the new engine. The valves are the weak if you get them too hot. Also I run my redrive belts loose to get things to run smooth. You will notice the engine RPM surging if you get too loose. If so power back a bit till it holds a steady RPM or you will burn the belts. I figure my engine as having 80 HP
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