OS/Graupner Wankel - It had to happen

sosam117 wrote:Last but not least --- the most expensive of all the 80th Anniversary Engines --- The Platinum Max-11AX engine:

GallopingGhostler wrote:

sosam117 wrote:Last but not least --- the most expensive of all the 80th Anniversary Engines --- The Platinum Max-11AX engine:

Given the exceptionally high cost of that engine at the time of production encourages me to take my humble, used, auction win OS Max .35-III R/C and era muffler, and further polish both to a mirror finish.

rsv1cox wrote:... I lost power for a few days, but took the time to clean up Wankel #3. Totally locked up with gobs of interrnal castor.  A Berrymans soak (in very cold weather) did wonders along with hot water and Remoil.

Levent Suberk wrote:OS Wankel Typ 7/67 from Graupner 1968 Neuheiten catalog.

gkamysz wrote:I didn't realize that was a best offer. Years ago Ebay used to show the winning offer, but no longer. Now you have auctions with offers. So the offer could have been above the minimum bid, no way of knowing.

I have one special edition OS. I couldn't resist the FS-56 Racer Edition.

Anyone remember these? I had one NIB for a while. I should have kept it.

rsv1cox wrote:Cleaned up well Chancey;

GallopingGhostler wrote:

rsv1cox wrote:Cleaned up well Chancey;

Interesting, with that brass mixture wheel, looks like it has a Perry carburetor sans the black anodized finish.

Levent Suberk wrote:I learn a new subject, thanks GallopingGhostler: What does a partridge in a pear tree represent? The partridge in a pear tree represents Jesus, the Son of God, whose birthday we celebrate on the first day of Christmas. Christ is symbolically presented as a mother partridge, a bird that will die to protect its young. https://www.tlha.org › christian-life

GallopingGhostler on Dec 04, 2020 wrote:

Mark Diedrichs wrote:Thanks Bro, Yes the industry standard Cox.049. Thanks for noticing the post. Great minds think alike! Happy Holidays To all you good folks!!!! Twelve Months twelve engines each month?? Just say'in, food for thought.....

On the first day of Christmas
My true love gave to me,
A Sportsman in a pear tree.

To make a long story short:

[Verse 12]
On the 12th day of Christmas my true love sent to me
12 Venoms screaming
11 Conquests piping
10 Spooks a-needling
Nine Medallions rev'ing
Eight Tee Dees racing
Seven Black Widows singing
Six Surestarts flying
Five Golden Bees
Four Strato Bugs
Three Pee Wees
Two RR1's, and
A Sportsman in a pear tree

rsv1cox wrote:Still a good one George!!!!

rsv1cox wrote:My son found a 36 page set of instructions for the OS Wankel in PDF:

https://www.os-engines.co.jp/english/line_up/engine/air/wankel/manual/rotary49pi_2.pdf

Some of the highlights:

O.S.Engines Mfg. Co. wrote:

ABOUT THE ENGINE

The O.S. rotary combustion engine, based on NSU/Wankel System, was the world's first production model engine of the rotary-piston type as invented by Felix Wankel in 1957 and produced by NSU/Wankel in 1959.

This highly successful application of the NSU/Wankel System to a power unit of miniature proportions, has only been made possible by the expertise of O.S. research and development engineers and by the high levels of precision craftsmanship achieved in its tooling and manufacture.

Operating principle

In place of the piston and cylinder of a conventional reciprocating engine, the Wankel motor has a three-lobe rotor which moves in a circular path, while rotating about its own axis, within a housing having an epitrochoidal bore – i.e. a wide-waisted figure eight shape. Planetary rotation is controlled by an eccentric shaft, an internally-toothed gear and a fixed pinion mounted centrally on the rear cover plate.

The tips of the rotor are in continuous contact with the housing, forming three chambers, reach of which changes in volume, with rotation, to effect suction, compression, expansion and exhaust phases, as in a four-stroke reciprocating engine. Spring-loaded tip seals on the rotor prevent gases from passing from one chamber to the adjoining one and the rotor uncovers ports, as in a two-stroke engine, to control intake and exhaust timing.

Features

• Almost total freedom from vibration
  Relatively low noise level
  Pleasant sound specific to a rotary engine
  
• Compact shape which enables easier installation in most models
  
• Commercially available top-quality model engine fuel containing 18% oil, either synthetic or castor, can be used.

Note

Do not use commercially available low oil content fuel.

Since this is a rotary engine designed for model application, there are some notes to be followed in order to run it well for a long time. Also, handling of this engine is some-what different from that of two-stroke and four-stroke engines.

1. Start the engine with an electric starter. Hand starting can be difficult due to the fuel mixture not having direct access to the glowplug, i.e. the glowplug does not extend into the combustion chamber and access is by means of a small hole in the housing.
   
2. Starting is difficult when the atmospheric temperature is below 10 C [50 F]. In this case, warm the engine to approx. 20 C [68 F].
   
3. Prime the engine fairly liberally with fuel and turn the propeller more than 3 turns so that all three chambers are primed. Start the engine in a short time (1~2 seconds). Prolonged application of an electric starter (more than 4 seconds) without engine firing will cause seizing between the side housing and the rotor due to insufficient lubrication. (Without firing, the fuel does not have sufficient lubricating as the oil in the fuel is diluted with methanol and additives.)
   
4. Try to set the needle-valve with one trial. Setting on the ground lacks sufficient cooling, and the engine easily overheats.
   
5. When the engine is enclosed in a cowl, be sure to make ventilation holes (outlet hole Should be larger than inlet hole.), or the engine will overheat, which results in poor engine running or possible seizing.
   
6. Do not remove the carburetor intake tube, or the engine setting may vary, which results in poor running.