Hi all,
I have had this discussion on other sites and it can get very personal ....... and confusing.

I fly diesels in stunt and need an abrupt cutoff at the end of the run so I would like to use chicken hopper tanks since they 'seem' the best for this effect.

Anyone see this differently? What designs would you advocate and why?

Thanks.

I've been flying diesels in Old Time Stunt, using regular metal uniflow tanks for more than 10 years with no problems with cut off.  Some will burp a couple of times before they cut off; others just quit.

Chris,

What diesel engine do you use for stunt? Also, what wing span plane etc?

Roger

I use a 52" Freebird powered by a PAW 40, a 42" Mercury Monarch powered by a PAW 19 and an MVVS 40 converted to diesel that will most likely find a home in anther Freebird but could be enlarged slightly if the engine appears more capable than the PAW.

I have had engine runs that end with a 'burp..........burp............burrrrrrrp,' for a couple of laps and while that is not critical in itself it can be annoying.

Cheers.

In my experience tank offset has the biggest effect on shutoff. Kick (offset/slant) the back  of the tank out from the circumference of the flying circle.

Dennis has the sure cure.   

Numbers? 1/4" of taper (or slant) per 4" of tank length is enough for all but the wildest of yaws. Applies to clunks, uniflows, soup cans, and even rusty old Veco tanks. The "bbrrrp . . . brrpp . . .  brppp" end of run stuff simply disappears. The engine dies like someone ran a wooden stake through its heart.

      Larry Fulwider