Paul There is the Mercedes coupler i talked to you before ,they have
     several models on EBAY and very cheap,you can design the shaft without
     spline but only an adapted flange cup to meet the coupler and the flexwheel
     as safety in case the rubber fail.I do have an idea of the shaft design with
     this Mercedes coupler.Ths one is for the 550 model http://cgi.ebay.com/**
     ebaymotors/Mercedes-W116-**450SE-W124-300D-T-300TD-T-**Flex-Disc-Kit-_**



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     http://tinyurl.com/3fhm24k


     Jean Prudhomme

   Does anyone have dimensions for this type of coupler?  I interested in the
   OD and the thickness in particular.

   Randy

    used to use own a few bmw 2002's back in the day.  These were used as a flexible coupling between
 the driveshaft and the output flange on the transmission (called Guibo joints).  Having broken a few
 and then needed to call a tow truck, I'd never use one on my airplane.

 half of the bolts were on the output flange, half on the driveshaft.  When the coupling came apart
 it was usually spectacular.

 Am I missing something-- are you gents suggesting using the flex disc in another manner?
 William Mason                


Yes i know on the car you do have lot of bending action and twisting but it have one model which have a steel cage and all bolting are lineup to the same circonference so if it fail it keep turning the shaft ,we can use a strongger one similar to the Mercedes 500 and built a similar cage and will be stronger and will keep the sungear shaft driven in case it fail.The steel cage bolted to the flexwheelIt worth to make one and test it.There is the picture of the one i am talking and the 500 Mercedes which i am sure is more stronger then the one you had on your car.

Jean Prudhomme