Prop for D&B 3.7
07-05-2011, 10:45 AM
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Prop for D&B 3.7
http://www.dandbengines.com/db37.html
Looking for a good prop for this engine.
My propblem is that the center shaft is 3/8".
Most props I want to use are already drilled for 10mm (Zenoah's)
I have put a VESS on this and like it, however was scared to keep on due to the prop adapter was crushing the wood, etc........
Am I going to have to sacrifice a good prop and didicate to this engine and oversize the hole and make/buy/get an adapter to go from 3/8"ID to whatever size OD i drill at?
I should also say that I am now using a TopFlight 22/6-10 on it now.
Being flown on a Balsa USA Ercoupe.
Does fly it, but the VESS and other props that I want to try are better...IMO
Looking for a good prop for this engine.
My propblem is that the center shaft is 3/8".
Most props I want to use are already drilled for 10mm (Zenoah's)
I have put a VESS on this and like it, however was scared to keep on due to the prop adapter was crushing the wood, etc........
Am I going to have to sacrifice a good prop and didicate to this engine and oversize the hole and make/buy/get an adapter to go from 3/8"ID to whatever size OD i drill at?
I should also say that I am now using a TopFlight 22/6-10 on it now.
Being flown on a Balsa USA Ercoupe.
Does fly it, but the VESS and other props that I want to try are better...IMO
07-05-2011, 12:23 PM
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RE: Prop for D&B 3.7
ORIGINAL: ROGER RUSSELL
http://www.dandbengines.com/db37.html
Looking for a good prop for this engine.
My propblem is that the center shaft is 3/8''.
Most props I want to use are already drilled for 10mm (Zenoah's)
I have put a VESS on this and like it, however was scared to keep on due to the prop adapter was crushing the wood, etc........
Am I going to have to sacrifice a good prop and didicate to this engine and oversize the hole and make/buy/get an adapter to go from 3/8''ID to whatever size OD i drill at?
I should also say that I am now using a TopFlight 22/6-10 on it now.
Being flown on a Balsa USA Ercoupe.
Does fly it, but the VESS and other props that I want to try are better...IMO
http://www.dandbengines.com/db37.html
Looking for a good prop for this engine.
My propblem is that the center shaft is 3/8''.
Most props I want to use are already drilled for 10mm (Zenoah's)
I have put a VESS on this and like it, however was scared to keep on due to the prop adapter was crushing the wood, etc........
Am I going to have to sacrifice a good prop and didicate to this engine and oversize the hole and make/buy/get an adapter to go from 3/8''ID to whatever size OD i drill at?
I should also say that I am now using a TopFlight 22/6-10 on it now.
Being flown on a Balsa USA Ercoupe.
Does fly it, but the VESS and other props that I want to try are better...IMO
07-05-2011, 12:34 PM
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RE: Prop for D&B 3.7
In dont mind the prices, but will I have to make my own bushing?
I had a machinest try to make a 3/8"ID to 10mmOD and said it was to thin walled to try and do.
That why I said need to sacrifice a prop (Only use on the Coupe) and drill a bigger hole then 10mm.
I could not use on my Zenoah's if I over drilled for this purpose.
Thanks
I had a machinest try to make a 3/8"ID to 10mmOD and said it was to thin walled to try and do.
That why I said need to sacrifice a prop (Only use on the Coupe) and drill a bigger hole then 10mm.
I could not use on my Zenoah's if I over drilled for this purpose.
Thanks
07-05-2011, 01:14 PM
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RE: Prop for D&B 3.7
ORIGINAL: Tony Hallo
Here's mine that I made, the 3/8'' bore is only as long as it needs to be, the center bolt is 5/16''.
Here's mine that I made, the 3/8'' bore is only as long as it needs to be, the center bolt is 5/16''.
Tony:
Is that from a D&B?
Looks like mine!
You turn that down on a lathe?
07-05-2011, 04:07 PM
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RE: Prop for D&B 3.7
call ken baker at Ridge machine, hes the builder of these fine engines. A 22X10 is the prop to run on the 3.7. I have three 3.7's ands two 5.1's. He can supply you with the bushing you need.
07-06-2011, 02:12 AM
#7
RE: Prop for D&B 3.7
ORIGINAL: ROGER RUSSELL
Tony:
Is that from a D&B?
Looks like mine!
You turn that down on a lathe?
ORIGINAL: Tony Hallo
Here's mine that I made, the 3/8'' bore is only as long as it needs to be, the center bolt is 5/16''.
Here's mine that I made, the 3/8'' bore is only as long as it needs to be, the center bolt is 5/16''.
Tony:
Is that from a D&B?
Looks like mine!
You turn that down on a lathe?
07-06-2011, 05:07 AM
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RE: Prop for D&B 3.7
ORIGINAL: Tony Hallo
Correction, the center bolt is 1/4''. Yes it is a D&B51, the 3.7 is the same. I turned it on a lathe. Not sure why Ken doesn't modify the design as you mention every prop worth using today has a 10 mm center hole. I got about five flights on the engine before the airframe met it's demise!
ORIGINAL: ROGER RUSSELL
Tony:
Is that from a D&B?
Looks like mine!
You turn that down on a lathe?
ORIGINAL: Tony Hallo
Here's mine that I made, the 3/8'' bore is only as long as it needs to be, the center bolt is 5/16''.
Here's mine that I made, the 3/8'' bore is only as long as it needs to be, the center bolt is 5/16''.
Tony:
Is that from a D&B?
Looks like mine!
You turn that down on a lathe?
I have contacted Ken via email and here is our correspondance.
Russell
The Hole needed for the guide is 3/8 " I put a bushing in most props.
Thank You
Ken
5/11/11, Russell, Roger wrote:
I have a (Bought used) D&B 3.7 on a Ercoupe and flies it nicely.
However I am wanting to get a different prop and am wondering what size of CENTER DIA do I need to get for the prop.
I see in your SPEC sheet for this engine it says 1/4 28 threads, so do I need to find a prop that I can drill to a 1/4"?
I have checked with some maufactures and most 22" props ( the ones I am wanting to try) all have 10mm center holes.
Any help/suggestions would be helpfull
Roger Russell
The Hole needed for the guide is 3/8 " I put a bushing in most props.
Thank You
Ken
5/11/11, Russell, Roger wrote:
I have a (Bought used) D&B 3.7 on a Ercoupe and flies it nicely.
However I am wanting to get a different prop and am wondering what size of CENTER DIA do I need to get for the prop.
I see in your SPEC sheet for this engine it says 1/4 28 threads, so do I need to find a prop that I can drill to a 1/4"?
I have checked with some maufactures and most 22" props ( the ones I am wanting to try) all have 10mm center holes.
Any help/suggestions would be helpfull
Roger Russell
He mentions using them.
Again THANKS to all the suggestions.
Roger
