Luga Propellers

55 posts in this topic

Posted

Hi guys.....at last I have been able to take-off..it's funny but since I got the prop it has been terrible weather (snow, storm, showers etc..), it was hard to wait.

So here my first flights using the Lugaprop/Koolprop in the 3 bladed and 2 bladed configuration (same diameter/69in). On the day of the flight I have not been able (not enough time) to fine tune the pitch for best performance and hence the actual figures are not comparable. Below are my first impressions for you after one flight with each setup..

In favour of the 3 bladed prop:

More t/o thrust (water t/o in 6 secs),

slightly smoother and for some..sexy look

In favour of the 2 bladed prop:

different nicer noise in flight (lower pitch sound) ..remember I have a pusher configuration with exhaust gasses going through the prop,

easier engine start (and starter motor turns faster),

low idle smoother (less/no chatter of the gears below 1800Rpm),

quicker engine response when going from idle to full power,

much lighter (2.5 vs 4.4 Kg) with less moment of inertia (2800 vs 4500)..

The fixed pitch Lugaprop compared to my IFA warp drive is able to provide as good t/o performance and even better cruise speed. I must say that my 2 bladed Warp drive was not able to absorb all the power as it was designed for 80Hp, not for 95Hp....

Next time I will have the data to compare the props more scientifically.

Cheeeers

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Posted

As far as my research on the scimitar shape, I found that it runs smoother and quieter, cruises very slightly more efficiently, and has better trans-sonic properties if you were to get the tip speed above .89 mach.  Downside is that it has a little less static pull.

So I decided to go a little longer scimitar than I would have gone with a straight blade  (to regain lost thrust) that will turn with higher tip speeds... but it should be able to handle that better.

Thanks. I choose thrust out of the hole I think.  Smooth is nice though.  Hard to tell.  At least with the Luga you can kind of afford to try both blade shapes on the same hub and whatnot. 

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Posted

Thanks for the update - I was just about to ask.... 

you mention 95 hp, what engine do you have? I’m currently using short 3 blade warp drive that worked well mith my old and tired 532 but don’t give what I expect from my 92hp Simonini.

please keep posting your impressions and kool experience

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Posted

Thanks for the update - I was just about to ask.... 

you mention 95 hp, what engine do you have? I’m currently using short 3 blade warp drive that worked well mith my old and tired 532 but don’t give what I expect from my 92hp Simonini.

please keep posting your impressions and kool experience

I'm just guessing Fred but I think that the 912ULS only transmits 95hp to the propeller.  

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Posted

Hi guys, I have the 912 UL / 80Hp fitted with the Xtra Kit (other pistons increasing compression to 11:1). The Xtra kit manufacturer claims 95 Hp.....

http://www.craftworks.biz/pistonsite/912sales.htm

 

Cheeers

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