prop advice for 75cc moki petrol

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richard armstrong
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prop advice for 75cc moki petrol

Postby richard armstrong » May 12th, 2019, 1:12 pm

hi all

75 cc moki is going in a 50cc greenly tug prop size for pull not speed

looking at a 3 blade 22 x 10 or 22 x 12

need advice on best size for pull not speed for 2 blade or 3 blade

this will be a tow tug i want to be able to 4-6 m gliders

also dose anyone have a moki prop drill guide or can you still purchase?

i have check the prop size on the moki website

advice welcome
Richard "the rocket" Armstrong

"Fly me to the moon" then crash and burn BABY!

Dave Wilshere
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Re: prop advice for 75cc moki petrol

Postby Dave Wilshere » May 12th, 2019, 9:02 pm

22 x10 3 blade for pull.
If you can run a 2 blade clearance 24 x 10 or 25 x 10 2 blade
Pretty certain the prop pitch bolts is the same as DA/DLE 85-100

richard armstrong
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Re: prop advice for 75cc moki petrol

Postby richard armstrong » May 12th, 2019, 11:00 pm

Dave Wilshere wrote:22 x10 3 blade for pull.
If you can run a 2 blade clearance 24 x 10 or 25 x 10 2 blade
Pretty certain the prop pitch bolts is the same as DA/DLE 85-100


THANKS DAVE

see you soon i hope
Richard "the rocket" Armstrong

"Fly me to the moon" then crash and burn BABY!

John Greenfield
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Re: prop advice for 75cc moki petrol

Postby John Greenfield » May 13th, 2019, 7:03 am

Richard
You will always get more "pull" with the correct size of 2 blade prop rather than a 3 blade. you say "50cc Greenley" but there has never been one that size, I assume you mean an SD Greenley, 88" span which was designed around a Zenoah 62. Built as per the plan there will be plenty of prop clearance for a 2 blade prop. I would suggest 24 x 10 for slippery glass gliders or 26 x 8 for slower draggy vintage types.

John

richard armstrong
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Joined: January 23rd, 2009, 1:14 pm
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Re: prop advice for 75cc moki petrol

Postby richard armstrong » May 13th, 2019, 6:57 pm

John Greenfield wrote:Richard
You will always get more "pull" with the correct size of 2 blade prop rather than a 3 blade. you say "50cc Greenley" but there has never been one that size, I assume you mean an SD Greenley, 88" span which was designed around a Zenoah 62. Built as per the plan there will be plenty of prop clearance for a 2 blade prop. I would suggest 24 x 10 for slippery glass gliders or 26 x 8 for slower draggy vintage types.

John


the smallest of the greenley collection

i think is the 88" span with slight mod

i was thinking of the ground clearance i had issues

i am not putting the wire under cart on

i using fg one i pick up at a swap meet about 1.5 in shorter

did think about adding bigger wheels to compensate???

24 x 10 to 26 x 8 range

if i go 25 x 8 or 25 x 10 would be a compromise and work across the both glass gliders and vintage?

thank john
Richard "the rocket" Armstrong

"Fly me to the moon" then crash and burn BABY!

John Greenfield
Posts: 361
Joined: December 5th, 2008, 2:08 pm
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Re: prop advice for 75cc moki petrol

Postby John Greenfield » May 14th, 2019, 6:23 am

the smallest of the greenley collection

i think is the 88" span with slight mod

i was thinking of the ground clearance i had issues

i am not putting the wire under cart on

i using fg one i pick up at a swap meet about 1.5 in shorter



Modified airframe, non-standard undercarriage and an engine well in excess of the 30 to 40cc it was designed for. It's clearly not a Greenley anymore.
FG undercarriage is heavier than the wire one, it will need extra internal structure in the fuselage to adequately attach it and larger wheels will be heavier and will cause more drag. All items that will clearly add weight and reduce performance !!!!!!
Why is it that people feel the need to modify a model that has been developed over more than 20 years and countless prototypes just to make it worse !!

Rant over.

John
Last edited by John Greenfield on May 14th, 2019, 6:29 am, edited 1 time in total.


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