REFLECTOR: Running without prop

[nmflyer1 at aol.com]

Excellent point on the timing of the pulses Brian, I had not thought of that one. I'm sure the balancing of the engine to within 1/2 gram, and the racing fluid damper all add just a little to things as well. 

Yes, research like you mentioned would be great fun. Perhaps we could get a grant of time & money.. as it seems to take lots of both. 

Kurt 


-----Original Message-----
From: Brian Michalk <michalk at awpi.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Sent: Mon, 27 Apr 2009 4:02 pm
Subject: Re: REFLECTOR: Running without prop


Okay, I'll jump in here.?
?
The maximum torque delivered by a power pulse is going to be determined by the speed of the charge burn rate. This has a lot to do with the compression ratio. A high compression ratio is going to deliver a higher burn rate. Take a small engine and run it at 5:1 CR, it will probably do fine at lower RPM's. It also makes it easier to start.?
?
This is also related to the discussion on the IVO prop used on big 4 cylinders. The four cylinder delivers a large power pulse in a short time. This has to be taken in context with the RPM. Kurt's V6 does have a redrive, but what it really does is converts torque for RPM. The power pulse on Kurt's V now takes twice as long as it would have, if the power was identical without the redrive.?
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What I wonder, is if one took the rotational inertia of the MT, and duplicated it by adding a plate to the IVO to increase the rotational inertia, would the IVO still fail? There's no question that the pulses on the IO360 are larger than on the Franklin. Maybe increasing the inertia of the system could reduce the negative torque pulses??
?
Lots of cool ideas that could only be tested with instrumentation. I wish I had time and money on my hands to do instrumentation like this. It would be a lot of fun.?
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Alex Balic wrote:?
> The magneto structure/flywheel is sufficient to run the small engines- it is?
> enough flywheel for a single cylinder- and it is a little heavier than you?
> think- it is not straight aluminum- it has iron magnets molded into it.?
>?
>?
>?
>?
> ?
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