Deltahawk article

[mlw450802]

Originally Posted by ship

turbos do reduce exhaust noise in some applications, although hearing a Formula 1 race engine at 19,000 rpm demonstrates it's not always the case...

The formula 1's are indeed an earache but the turbos were apparently very effective on reducing the noise from the indy cars as anyone who had been to the race the last year they allowed turbochargers and has also been to subsequent races where normally aspirated is all that's currently allowed. They are now cruelly noisy.

I imagine the Deltahawk's exhaust does really benefit from noise reduction due to the turbo's extracting so much energy from it.
I know in the olden days when truckers put straight pipes on the 'jimmy' diesels (supercharger only) they were quite impressive in the noise department.

[ship]

Originally Posted by mlw450802

I imagine the Deltahawk's exhaust does really benefit from noise reduction due to the turbo's extracting so much energy from it.

true. as you correctly noted turbos are decent mufflers, although the intake on the compressor side makes a fair amount of noise in it's own right

Originally Posted by mlw450802

I know in the olden days when truckers put straight pipes on the 'jimmy' diesels (supercharger only) they were quite impressive in the noise department.

loudest thing ever to hit the road....my father-in-law was a trucker for 45 years...he owned a few...told me the most impressive part of the old jimmy's was the flames coming out of the stack at full tilt going up steep hills, followed closely by the belching smoke.

the irony is with all the fireworks, noise and smoke, the things could barely make it up hills with a full load.

DeltaHawk is quieter with the exhaust pipe (in the plane) than without (on the test stand).

[ship]

Originally Posted by Deuskid

according to Thielert's website [I have a link in the other thead and I linked this thread to that earlier] D2 is recommended.

...some further insights on JetA vs. Diesel in aircraft applications. note that low sulfer causes other problems w/lubricity.
http://www.generalaviationnews.com/e...index&-nothing