high altitude props

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12-25-2010 | 10:58 PM

#21

TahoeRick

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Joined: Nov 2010

Posts: 403

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Quote:

Originally Posted by bobsbillets

I have a set of 22P bravo 1's in great shape if you feel you need these. $550 to you door for the pair. They are bone stock with no dents dings scrapes, ect.

Are you the "Rob" mentioned in the Warlock section with this phone number: 951-204-8892 ? I was told you also have a set of 24's. I am waiting to hear what Brett has to tell me. It is my impression that he and the business he represents are the experts. I have not spoken with him yet. I have all kinds of question, such as what does "lab finishing" get you and for how much? Blueprinting too...

Rick

12-26-2010 | 01:05 AM

#22

Griff

Charter Member # 55

Joined: Oct 2000

Posts: 20,241

Likes: 2,490

From: Omaha/LOTO

Quote:

Originally Posted by TahoeRick

I think it is 1.36... If I hit 4500 rpm then it sounds like a drop from 28's to 24's would get me to 5500 rpm at most. Perhaps I need a little more drop in pitch like a 23 ?

The previous owner specifically warned me that if I used too high of gearing it would put an unacceptable strain on the motors and I could damage them - bend a rod, etc., that I needed to properly gear it for the elevation at Tahoe. This is where Brett of BBlades comes in.

Try a set of stock 24's and then go from there. BBlades can lab them to gain more rpm, but he will most likely need a closer baseline than the 28's will provide.
BBlades also has a test program for props.

Also, lugging the engine at too low of a WOT rpm caused by too big of props is hard on the engine and can cause detonation.