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Engine basics => Engine set up tips => Topic started by: Mike Scholtes on February 15, 2008, 05:26:17 PM

Title: 3-blade prop for LA46?
Post by: Mike Scholtes on February 15, 2008, 05:26:17 PM

Anybody have a success story using a 3-blade prop on an LA46? I have this engine in three models: Imitation (631"), Olympic Mark VI (560"), and Vector 40 (536"). It likes a fairly flat 2-blade like the APC 12.25x3.75, but not sure how it would react with a 3-blade such as 11x4 Bolly or Eather.

Title: Re: 3-blade prop for LA46?
Post by: Jim Oliver on February 15, 2008, 06:08:21 PM

Mike,

As usual, I go contrary to conventional wisdom.  I am presently using only one OS LA46, on a Cardinal profile with 2 blade Zinger 12x5.  Take off at 7900-8000 rpm, 62 foot lines, eye-to-eye, Powermaster 10/22.  The down side of this set up is that it seems to need more fuel to fly the pattern than the high rpm type run.  Flew this at KOI a few weeks ago.

My point is that the engine will take more prop load than some applications would indicate.  One of the Master Airscrew 10x5 props might be a good place to start.

Cheers,

Jim

Title: Re: 3-blade prop for LA46?
Post by: Steve Fitton on February 15, 2008, 07:08:20 PM

I have an LA-46 that really likes a Gator 10.75x3.75 three blade.  A Bolly 11x4 three blade will work as well.

Title: Re: 3-blade prop for LA46?
Post by: Willis Swindell on February 15, 2008, 08:36:09 PM

I have a La 46 in a cardinal with a three blade 10x7 Master air screw which is really a 10x5 and works great. A three blade 11x7 air screw, which is a 11x5 is a little to much for the 46. I picked up a three blade 10x5 Master air screw at  the local H.S. and it pitched out to a 10-3 1/2 on my gage.
Willis

Title: Re: 3-blade prop for LA46?
Post by: John Cocking on March 09, 2008, 04:30:25 PM

Aah, a useful post. I will try the Master 10/5 3 blade shortly.

Title: Re: 3-blade prop for LA46?
Post by: Ray on March 09, 2008, 07:39:31 PM

Quote from: John Cocking on March 09, 2008, 04:30:25 PM

Aah, a useful post. I will try the Master 10/5 3 blade shortly.

Ah, Hah!  A non-negative comment!  How about that!  Still unnecessarily sarcastic, but looking at the sig, to be expected I suppose. 

Title: Re: 3-blade prop for LA46?
Post by: Bill Little on March 10, 2008, 07:10:28 AM

Quote from: Ray on March 09, 2008, 07:39:31 PM

Ah, Hah!  A non-negative comment!  How about that!  Still unnecessarily sarcastic, but looking at the sig, to be expected I suppose. 

Ray, see my post on the other threads. (Fox 15, Fox 35)

Title: Re: 3-blade prop for LA46?
Post by: Larry Wong on March 16, 2008, 01:24:52 PM

You can try a Bill Lee 3 blade prop. they have narrow blades cut a 12" down to 11.3 x4 should put you in the ball park.