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Cox Engine of The Month
May-2020
Levent Suberk's

"Medallion .049"



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Post  Levent Suberk on Wed Mar 18, 2020 7:45 am

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Post  robot797 on Wed Mar 18, 2020 7:50 am

hahaha
you cant find the manual cant you
I had the same trouble
currently I have 2.5 running of type 1 (and 1 for show)
and 2 running type 2
and type 3 is to hard to get for me

when I am done with this wankel car I might put a type 1 in a boat
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Post  Levent Suberk on Wed Mar 18, 2020 8:15 am

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Post  Levent Suberk on Wed Mar 18, 2020 8:18 am

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Post  robot797 on Wed Mar 18, 2020 8:21 am

jep
the type 3 had 3 versions
the normal the gold
and the skeleton
(the last one is my faforite)
the gold en skeleten editions are wothe more then gold
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Post  Levent Suberk on Wed Mar 18, 2020 8:44 am

I had a small square shape booklet instructions once. It is from Graupner. I remembered it from late seventies. There is an OS Wankel photograph on a black background on cover. But I don't know where it is now.
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Post  gkamysz on Wed Mar 18, 2020 8:46 am

PI indicate peripheral induction. The first issue has the carb on the front, not the side. I think the main difference between the first and second PI is the method of manufacture for the rotor housing.

I have a few PI. I need to make a video. My plan is to build a twin rotor, but that's been done before. I'm continually amazed at just how many of these turn up on Ebay considering I've never seen one in use. The rotary hype today has driven prices to insanity. I bought the my last before prices went nuts.
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Post  Levent Suberk on Wed Mar 18, 2020 9:04 am

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Post  robot797 on Wed Mar 18, 2020 11:29 am

I beleve that is supposed to be a manual for the type 1
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Post  robot797 on Wed Mar 18, 2020 1:30 pm

here ya guys go
pictuses of the custom parts (and modivied counterweight)

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Post  Levent Suberk on Wed Mar 18, 2020 4:06 pm

The Graupner/O.S. 49-PI, sold in the US as the .30 Wankel, meant for model radio-controlled aircraft.  This is the smallest rotary combustion (RC) engine ever produced.

The German firm Johannes Graupner made model airplane kits and became interested in RC engines after a Wankel symposium in Munich in 1960.  The Wankel's lack of vibration, small size and weight for the power, and central output shaft offered huge advantages for models: vibration, for example, damaged expensive radio equipment and servos.  Engineering work mass subcontracted out, and by May 1967 Graupner was flying a prototype.  The firm became the 17th NSU/Wankel licensee on 12 September 1967--the only one for such small engines.  To produce them, it immediately teamed up with Ogawa Seiki (O.S.) in Japan, then already well known for model airplane engines.

 O.S. required two years to begin making Graupner's engine because the specialized machinery to grind the rotor housing wasn't yet available.  After working preproduction bugs out, the engine was introduced in 1970 and became available in the US the next year.  At first it was rated at 0.63 hp at 16,000 rpm, but after revisions in the early '80s it was capable of 1.27 hp at 17,000 rpm.  (Output will depend on the nitromethane fuel blend used.)  Typical idle speed is around 3,000 rpm; maximum speed is around 20,000 rpm.  Rotor radius (-prime) x eccentricity x width (R' x e x B) are 22.0 x 3.0 x 14.5 mm, giving a chamber volume of 4.97 cc (0.303 ci).  With its huge muffler it weighs only 380 grams (13.4 oz).  It has a glow plug ignition and carburetor typical of model engines.

Unfortunately, O.S.'s importer would not respond to my repeated requests for information for a book about RC engines I had once planned, so I bought one of these little engines in early 1997 and partially disassembled it.  (For example, I had to measure the rotor dimensions myself, as no reference source provided them.)  The .30 Wankel then had a list price of about $400 but typically could be bought for half that.  Even now, Graupner's name appears with O.S.'s on the box, as do the words "System NSU Wankel", and that box is a cube only about 120 mm (4-3/4") each side.

(An excerpt from: https://web.archive.org/web/20120626160403/http://www.rotaryaviation.com/rotaryhistory.htm#Part%201)
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Post  robot797 on Fri Mar 27, 2020 8:26 am

good news
the engine is mounted on the car
and i hope that I have the time to do the electronics this evening
then i can do test runs and tune the carb
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Post  OhBee on Fri Mar 27, 2020 4:33 pm

Man I'd love to have one of them! I worked on the Sachs Wankels installed in snowmobiles in the 70's. Not fast but gobs of bottom end!
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Post  robot797 on Fri Mar 27, 2020 5:50 pm

I recently got a sachs KM3
dont know what to do with it
but i do know I wanna tune it to the max
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Post  davidll1984 on Fri Mar 27, 2020 9:23 pm

johnnyQ90 machined part build 1 same ting for rx7 is it his engine ? look you tube meabe talk too him of cox engines try to get him in
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Post  robot797 on Sat Mar 28, 2020 5:25 am

nope
this is a seperate engine (that is why mine is the 2nd in the world)
and it would be fun if he would join this forum
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Post  Ken Cook on Sat Mar 28, 2020 8:17 am

I attended Brodak's in 2009 and a fellow club member had just mounted the Wankel on a Brodak Super Clown. It was neat, uses fuel like a pig though. In my opinion too heavy for it's size. It certainly sounded way different than the normal 2 stroke.
I flew it later that evening. This engine is the messiest engine ever. os wankel? - Page 2 Part_111
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Post  robot797 on Sat Mar 28, 2020 8:24 am

there messie there smelly they drink like mad
but the power they have is awsome!
teaser time
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Post  robot797 on Sat Mar 28, 2020 9:18 am

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Post  davidll1984 on Sat Mar 28, 2020 9:16 pm

so cool congratulation bravo like it wat frame is used ? big tire 4x4 sound like a future basher nex 1 try wit cox engine i found nice model to start wit wl toys 1/18 has aloy frame wit 049 900gram is max it wil moove with 1/18 wil turn bing les weight compare to 540 engine batry speed control
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Post  GallopingGhostler on Sat Mar 28, 2020 11:53 pm

Congrats robot797 on the fine installation in that car, runs really good, certainly moves out. I am amazed how the rotary engine sounds, has its own unique signature.

What amazes me about the Wankel is it is truly a 4 cycle engine although appears to operate more like a 2 cycle. I remember the Mazda R100 back in the early 1970's when it first came out, followed by the RX-2 and RX-3. Back in Hawaii, I was interested, but was a soldier and after a college student and such were out of the question financially. Plus, I spoke with one of the mechanics at Mazda dealership in Honolulu, seems that owners did not know how to care for the Rotary. They weren't maintaining the water system like they should. Overheating ruined the rotar tip seals requiring an expensive overhaul. The engine produced more horsepower, but weren't that great on gas efficiency, getting what some were getting with the larger 6 cylinders and small block 8's.

Plus, contributing to the poorer gas mileage was the emission control requirements to clean up the oily exhaust. A small amount of oil was injected into the air fuel mixture to lubricate those tip seals. Basically it was like adding emission control equipment to a 2 cycle engine, considerably more required than for a standard 4 cycle piston engine car.

Someone here I forget who also had a Japanese rotary engine motorcycle of the 1980's, I forget which make, Suzuki? It was short lived also.

I don't know of anyone using the Rotary engine technology these days. The "inferior" 100+ year old piston engine technology won out.

Anyway, thanks for sharing. I always thought about getting the Wankel, but at a touch below $500 and the fact a similar powered 2 cycle Schneurle was 1/5th the cost, just didn't make financial sense. (Job, marriage, house, kids, those won out.)
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Post  robot797 on Sun Mar 29, 2020 8:08 am

thanks for the nice coments
i went and tuned it a bit today
and I streched the run time from 2-5 to around 5 a 6 min
it has a lot more power now
but I also ran into a problem
my onboard glow uses a bit to much power
it drains the batteries way to fast
I need to install a second battery box for the onboard glow funktion
also the car i used is a protech promax
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Post  Ken Cook on Sun Mar 29, 2020 9:28 am

Mazda wants to bring the rotary engine back. They were always problematic with emission standards. It seems as though the engineers/designers are having a tug of war between the old rotary and electric. For now our club has one flying which I haven't seen out in years. If you want to convert glow fuel back into castor oil, just run it through the Wankel. https://www.facebook.com/PhillyFliersCL/videos/335391430687532/ My flying buddy Dan was running this one a few months ago. Notice the high tech engine stand. I really like the zip tie holding the engine on the piece of 2x4. Don't try this at home. I love the way the engine is loose and jiggling around, I'm actually surprised he's not standing in front of it with the tach about 1/2" away. I have to remind these guys that the nearest hospital is over 40 minutes away.  I have mentioned many times of how frugal the control line flyer can be. Our first aid kit onsite might have the capability of keeping a mosquito bite from getting infected. The box has a few Dora the explorer band aids and burn cream. It's quite embarrassing actually.
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Post  davidll1984 on Sun Mar 29, 2020 12:06 pm

if posible ad second glow driver wit lipo batry
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Post  robot797 on Sun Mar 29, 2020 12:55 pm

@davidll1984
that is the plan
@ken cook
mazda is bringing it back
the rx vision and hybrid mazda 2's
and you can hold a rc wankel with such a flimsy strap because it doesnt fibrate that much
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