Actual Killer Bee numbers from Cox?

1/2A Nut wrote:I have data with a 5 x 4.5 similar loading ish to a 6x3 - turbo plug adapter used.

That's the thing. Lots of people have personal experience and data, but I'm looking for what Cox said that the KB would do, if Cox ever put out any numbers. I want to use the official numbers as a reference for what I come up with.

The Officious Mark

1/2A Nut wrote:The Killer Bee manual dated 1995 does not state what the engine can do per prop brand / size.
It does say to prop the engine at 22k static or less for longer life.
At the time of print it does state a few suitable props to include the APC 5.5x2 / Cox 5x3.5 / Cox 6x3
 

Yeah, I read those numbers from the data sheet.  I was just hoping someone had seen something concrete in some other Cox literature.  Lacking official numbers, I was going to just use Tee Dee .049 numbers as a reference.  But looking at the data sheets available on Bernie's site, there are two data sheets for the Tee Dee .049 engine.  The data sheet from 02/61 for the Tee Dee .049 and .15 engines, and the later sheet from 02/82 for the Tee Dee .049, .051, and .09 engines.

The top end numbers for the .049 are a little different, but the low end aren't.  Maybe this is because they stopped doing the tapered cylinders in the mid to late 70's?

02/61:
5Dx3P      23,000 RPM
5.5Dx4P   18,500 RPM
6Dx3P      18,500 RPM

02/82:
5Dx3P      21,000 RPM
5.5Dx4P   17,000 RPM
6Dx3P      18,500 RPM

The purpose of my proposed build of a KB clone is not to get the highest RPM, but to get the max horsepower to turn a 6x3 prop on a control line plane.  This would be a departure for me as I'm a died in the wool 5x3 rubber ducky fan. There was talk of not doing the Junkyard Wars at Brodak this year and replacing it with a One-Design contest using the SIG Skyray and limiting it to reed valve engines.  The CD changed his mind and they will have a Junkyard Wars after all, but there might be an unofficial Skyray fly-off anyway.  This will be my first Brodak contest, and while I am no threat to any of the competitors, I thought a Skyray with a KB clone turning a Cox competition grey 6x3 would do well.

The Convoy Mark

edit:  The Sceptre flight article on the Tee Dees from 11/61 states the Tee Dee .049 will do 24,000 RPM with a plastic 5x3 and 18,000 RPM with a 6x3 prop.
The SceptreFlight article from 12/61 had 21,900 on a 5x3, 19.8 on a 5.5x3, and 18,300 on a 6x3.
The Sceptre flight article from 11/62 had 21,000 on a 5x3, 18,200 on a 5.5x4, and 18,400 on a 6x3.

Sceptre flight also has horsepower peaking at either 19,000 RPM, 21,000 RPM, or 22,000 RPM, depending on fuel and prop I guess.  So, the Sceptre Flight articles are all over, and I'll just ignore them and go with the Cox charts.

The Getting More Confused Mark