Hey, I'm trying to find the smallest produced RIRE or at least rear rotary intake SPEED engine. I know there's a couple custom COX 049's but I'm thinking better then that. I know there's a Super Tiger .15 but that's about all I've found. Anyone else have any example/pictures?

This never went into production, but is a high performance micro engine.

http://www.jettengineering.com/news/news.html

Pork barrel projects come in all shapes and sizes.
The sad part will be after the ill conceived project is scrapped, the generals and GS-15s who will SNARF these engines up for just another show and tell trinket to have in their office trophy cases.

Eloquently said, and sadly true. I've seen some real weird sh......... er- uh stuff. I could tell ya but then I'd have to.......

WOw, that JETT is super cool.

Is there anything around the .10-.15 size thats actually obtainable?

Im with CP on the subject of collectors...

I have a K&B .21 FIRE on a 70% Diamond Dust

I have a Rossi .15 RI RE and a Supertiger G.15 RI and also a Supertiger X .15. I know there are a bunch of little diesels around from team racing and smaller ones likely too.Oliver Tiger,ETA's maybe.

Cox Conquest .15 was the engine of choice in QM for a while in the 80's

The Nelson .15 FIRE was at the top of the heap at the end of QM15. Here are some others that also had their day in the sun.

Couple of Supertiger RR RE, and some other various rear exh. smaller stuff. CS .049, Uktam (MDS).15, AP .15 I have played with lately. K&B .29 RR RI. A little trouble with pics. I'll keep playing.

I think I got a Rossi, Stels, AMEand a Cox Conquest in there too. If you want a fast motor, I think a front intake is faster. That is likely why they don't make them any more. The team race diesels use them because of the tighter base compression giving better mileage, but I think the friction frome the rotor slows the little ones down too much. The smallest RR I could find is the K&B .21 from Mecoa @$200. There may be some little diesels I amnot aware of. Any front intake better quality european motor would likely matchthem for perf. and maybeprice. Novarossi, Picco, Profi, Fora.

Yeah Im sure your right, but a lot of motors you see used in the Speed Cup are rear intake. Even some converted to rear intake. It's more that it just fascinates me the rear intake rear exhaust. I will have to keep my eye out for one of those super tiger x's or maybe a british 1/2a race diesel. THe K&B .15 also looks dang cool.

Thanks guys! keep 'em comin if you find more!

The K&B is a .29. The Rossi's and Cox Conquests were faster than the Supertiger X .15 back in the 1970's. They have come a long way since then. We were going 160 mph then, now they are over 200mph in FAI Speed (F2A) They use FI for all of it now. I would have to say they are overengineered now, for anyone that is not serious. They sure sound wild though. I saw a Rossi ducted fan motor in the rc canada website for $300. it is a .65 cu in. It is a rear rotor rear ex. probably.

OPS and Rossi both had rear-rotor .15 size engines... OPS .29 can be found once in a while too.

Hunt down some of the Free Flight websites. Usually they have the best collection of FIRE engines

Front intake Vs rear intake

Simpler maintenance - FI
Easier to cowl cleanly - RI
Smaller crankcase volume - RI
Shorter crankshaft - RI
Smaller diameter crankshaft - RI
Lower internal drag - hmm

More parts a turning, but the bearing balls running slower in the races.

I would imagine the engine designers could add a dozen more considerations to the list. But what if the engine did not have to drive the rear rotor or drum?

Like the old piston port motors from the 1940 era, and the reeds.

Have the engine drive a Hall sensor and use an electric motor driven and synchronized ball valve.

I have a UCCUM 09 with pipe thats rear exhaust. I am at work now but can get pics up later tonight. I think it was right around 30,000 on a 7x3


It might be out of your size range but i dont think anything out there can beat the Jett BSE 35 LX FIRE with higher timing.

You can also can some of the R/C car engines in rear exhaust that can turn a 7x6 APC in the 23,000 range. the traxxis engine has the longest stroke and makes great power.

Hobby Club carries the Uctam (or Uktam or whatever) .09.  It is a big heavy crude rear rotor front exhaust (which could likely be reversed by flipping the middle casting to make a rear exhaust)  I would replace the screws and clean it out before running it.  I have a few Uktam .15 motors and one wouldn't even turn over.  I had to lap it first.  The screws look like they are from WW1 and some were hard to get out.  The castings are sand cast and when they are drilled, the sand chunks in the aluminum ruins the drills and taps so the screws are tight.  Having said that, They are pretty good motors for $50.  All the best motors seem to be sand cast, or at least rough looking castings as they are more of a custom thing. (Picco, Rossi, Russian stuff etc.)

this one is reversed. yes it is heavy at around 6 oz. For reference the LA is 5 oz.

the Uxxtam engine can be lightened up a bunch well about 1-1.25 oz anyway. still heavy but if wanted a small high rpm 09 might be something you can still get for the cheap.

Usually you need noseweight anyway. I heard they have a steel shaft housing.  A little lathe work could shave off weight quickly.  I guess that is the smallest one available then so far.

I would think someone out there is making a smaller .049-.09 in rear exhaust with pipe and all.

CS, It is a FI, RE but don't know if they are still available. They made the Brodak motors, but I heard they won't make any more castings, so it is whatever they have left in stock. There was a pipe for it. The timing was different on the normal and the piped version. I think the Profi might be quicker though. I believe Ucktam had a pipe for the .09. There was a boat motor like that too. The Toki has no pipe and is a side exh. I don't know of any car stuff. Maybe some .12 size.

yeah I was looking at the Uxxtam, Maybe I'll get one of those, but i've heard a lot of terrible things. I really just want to fly a rear rotor engine. Biggest ive ever flown is 061 and I have a .12 thats going in a plane soon. I think 15 in the biggest I wanna go.

CP, I think you will find this interesting:

http://eetweb.com/news/electricSUperchargers/index.html