So... a DF jet for my RFFS 100?????

[phuffstatler]

Any ideas if anyone has been toying with a super tiny DF design????

I can see a itty-bitty F4 Phantom cruising(flitting?) across the yard....

I know there would be numerous problems with air density through a fan and ducts at these small sizes... But that's half the fun, coming up with ways to circumvent such things...

I've got a Jetx 50 and a tiny F9F Panther kit, but that would be too easy.... or would it?

Just trying to provoke some thought along these lines...



phil in austin

[Dave Robelen]

OK Phil,
Now Iv'e thought about it. From past experience an EDF has about 1/2 the thrust of a prop for similar power in. ONTOH, with the new LiPoly cells becoming available, you may be on to something. If you wander through the Aeronutz site, you will find there is a fellow over there who has been scratch building tiny fans with some success.
Cheers, Dave

[William Robison]

In 1957 or early 1958 I built a Monogram F9F and put a Jetes 50 in it, with the Jetex supplied augmenter duct work. Everything fit nicely inside, but I had to leave a big hole in the bottom for engine access, and for inlet air. Nowdays this is called a "Cheater hole." It didn't fly very well, but it did fly. If you go by Debbie's RC World, in Virginia Beach, Va, and if Les has not yet shipped it back to me, you can still see this 40+ year old airplane. Additional note: the problem with all Jetex powered planes is just that - power. To get anything approaching decent performance you have to add so much lightness that the plane is extremely weak, almost to the point that it can only be flown indoors.

[phuffstatler]

There is a thread over on the Ezone discussion groups that's designing and working through some problems getting a ducted fan running with the RFFS100 sized equipment. They're doing very well with it, better than I would have alone... You might want to look it over...

http://www.*************/forums/showthread.php?s=&threadid=68465


I've got a Jetex setup here, the 50 size. It's a pain to use (fuses pulled out with needle nose and such, but it's neat to play with....


Phil in Austin

[William Robison]

Phil, thanks for the response. A Jetex trick you might want to try - in normal ignition the fuel burns flat, and the thrust is relatively constant. To get greater thrust, drill a hole into the center of the fuel pellet, and instead of coiling the fuse it to light the pellet on the end stick it into the hole you just drilled.This way you will still get the burn started on the end, but you will also have a flame front growing through the center, with a constant increase in the burn area. The result is the thrust building all the way through the burn. As the burn continues the area of burn will keep increasing almost until burnout. You can vary this by making the hole deeper or shallower, about halfway through always worked best for me. The deeper you go, of course, the faster it will burn out. There is a price for the thrust increase. Would suggest expending a fuel pellet while you watch the engine, to make sure the retainer clip will hold the cover tight with the increased pressure. A faster burn does no good if it blows out the side instead of the nozzle. Enjoy. (signed) WLR

[J shizzy wizzy]

THERE IS SUCH A THING AS REMOTE CONTROL JET PLANES!!!??

WILL SOMEONE PLEASE GIVE ME SOME INFO. ON THIS....LIKE SOME WEBSITES I CAN VISIT OR WHAT NOT, I FIND THIS VERY INTERESTING!!
THANKS
-JUSTIN

[William Robison]

J Shizzy Wizzy, you're here. Look no further. Go through all the threads in this section, decide who you want to talk to, and bug 'em. I'm sure there's someone around Anaheim who will be willing to assist you hands on. Anybody else reading this know of one there? Don't be put off by his handle, He has more time with a transmitte in his hands than most of us!

Fly a TWIN, it's not a SIN!

WLR