Ok guys this is the time to tell your secrets

i am currently in a build for the DD, and have put together a plna , which now needs an engine

i am considering either the Jett F1 or F3D engine , or the Jett 50 FIRE

the reason i am considering the JEtt F! , is because it should have more RPM on an 8 " prop , and will probably pull the dust faster

let me have your comments / thoughts

thanks
Izzy

I vote Jett FIRE 50. After owning two DD's and following their threads for years, I don't think the small diameter props will give you much speed advantage. The Dust is not clean enough to avoid the thrust = drag speed barrier IMO.

Other things to consider:
A throttle is nice. I can not imagine not being able to throttle back to prepare for launch. Not much to hold onto.
Serious mods are needed to mount a rear intake engine. It can be done though.

Sounds like a good idea to me

If you are going to use a Jett engine, consider the Jett FIRE 60LX, it is the same weight as the Jett 50 and will turn the prop faster. Mine turns an APC 8.8X9 at 19,600 rpm and the APC 8.8X8.5 over 20,000. After flying my DD with this engine all of my other planes seem to be flying in slow motion. Call Jett and talk to Dubb he will give you some good information on engine choices.

I echo Huey's choice. The Jett 60 LX would be my dream sport engine (i.e. with a throttle) for the Dust (but it's $350)...

The race engines (like the Jett FAI or Jett QM-40 or Jett F1) will turn more RPMs (abiet on Q40 or Q500 props) but then you lose the throttle

Don't forget a large tank of go juice for a large motor. LOL

True, you don't want a minute and a half Dust

Jett no longer makes the F1 engine.

The F3D "practice" engine with a carb is a nice engine, but designed to run with the carbon 7.5x7.8 APC QM40 prop around 26,000 rpm. It has some throttle control, but not much. More importantly, the DD needs more prop disk area for a decent launch.

The engine you would want for peak performance is the Jett FIRE60LX - nitro or quite pipe. Use a 8.8x9 prop or an 8.8x9.25 clipped a tiny bit. A standard 9x8 or 9x9 are alternatives. I'd suggest getting the cast case version (a few $$ less than the BSE). Best economy and power (pretty darn close to the FIRE version) is the SJ-60LX side exhaust. No pipe to worry about - same props - costs about $75 less than the FIRE/pipe setup. Trust me, you need some spare cash to buy new underware... so not a bad option at all

That engine is the same size and weight as the racing engines, and will outperform them - and it will idle. throttle, and transition. Very user-friendly engine.

You also must have a bubble-jett fuel tank. Absolute must on the DD with the 60LX engine.

Bob