L67 parentage

[VSIIBerlinaL67]

lol dam too late

 

[ozman599]

Well thats good that the Alloytec is 60deg. That means it is an even fire engine and would be suitable for my application. For an explanation of even fire have a look at this page
http://www.epi-eng.com/ET-PistonExcit.htm
If it is all a bit wordy just scroll down to the bit about even and odd fire sixes

 

[hakhawk]

so, whats your "application"? you got me curious now as to what you're doing with it

 

[ozman599]

so, whats your "application"? you got me curious now as to what you're doing with it

They say a picture paints a thousand words so have a look at this one http://www.tally-ho.org/images/completed/tally-ho image9.htm

 

[hakhawk]

ahh, mean as, so you need even fire to keep it nice and smooth in the air yeh?

 

[ozman599]

Its a bit more involved actually. The problem is that unlike cars aircraft don't have a long flexible driveline with tailshafts, diffs, axles, rubber tyres to dampen the power impulses from the engine. If an engine is uneven fire and the prop and transmission shaft are not carefully chosen a harmonic or series of harmonics can exist through the rev range that can lead to prop blades departing or even engine mounts being destroyed. All of which can be guaranteed to ruin your day.

 

[hakhawk]

ahh, yep yep, as it would.

keep us updated with progress, im keen to see this evolve.

 

[ozman599]

ahh, yep yep, as it would.

keep us updated with progress, im keen to see this evolve.

Will do that, cheers.