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What does the torque converter bolt to? I thought they bolted to the holes Tracy uses for the 'damper' puck bolts.
The counterweight is connected to the eshaft with a key. Then the flex plate bolts directly to the counterweight
Hi there Dave
I understood the torque converter was driven from the flex plate. Can someone confirm how power is transferred from the Eccentric to the torque converter?
Steve Izett
in the car, the flex plates are only used to carry the torque from the starter and are not designed to transmit the output of the engine. in our setups. We have adapted this flex plate to transmit the entire output of the engine which it apparently is not up to.
I had my rd1-b seize up a bearing during a race at Reno which may have been due to gyroscopic forces, but I think the flex plate issue just needs to be fixed by replacing all the flex plates with proper flywheels.
Dave Leonard What i can rember was this also a topic on the late Paul L group discussion. Maybe Dave Leonard can chime in - think more that it was gyroscopic forces that craked the plates Maybe i can find the photos and topic in my old mails Sent from my iPhone Le Roux Breytenbach Maybe some of the cracking flexplates are resulting from starting issues, the starter motor can hammer the ring gear if not meshing correctly or if engine misfires on start. may explain why so many flexplates come pre-cracked from the wreckers.
Andrew Hi M
I was wondering the same thing.
What I discovered first of all was that flex plates are designed to flex (funny that) and cracking is not limited to our setup.
There are companies that specialise in stronger flex plates, particularly for modified and higher horsepower engines.
Since our engines are being used at a higher horsepower per unit time and therefore higher stress (assumption) perhaps our setup could be likened to race applications.
But then our hours of use would be significantly lower (assumption) than an average vehicle, but perhaps not a race application.
Is the cracking we are seeing consistent with race applications? But they dont race automatics, do they?
So my take on this is that perhaps the flexing of the plate in our setup is to some extent higher than OEM.
Our options seem to be:
1. Replacing the OEM flex plate with a stronger part. Steve B being the latest going down that track and in his case also removing the rubber isolation in the process.
2. Connect direct to the eccentric shaft and therefore taking the stress off the Flex Plate doing away with the damping mechanism which Tracy did, and perhaps is still doing. Would be real nice to know.
Like M, I would appreciate hearing what others know or are thinking or doing.
Steve Izett
> On 10 Jan 2025, at 2:15 am, Marc Wiese cardmarc@charter.net <flyrotary@lancaironline.net> wrote:
>
> Has the cause of these cracks been uncovered, and if so, what is the current thinking on it? An AL racing plate?
> M
> Sent from my iPhone
>
>> On Jan 9, 2025, at 1:31 AM, Steven W. Boese SBoese@uwyo.edu <flyrotary@lancaironline.net> wrote:
>>
>> Steve,
>>
>> I didn’t see the cracks prior to disassembly and doubt that they could have been seen on the counterweight side very well -if at all- when assembled.
>>
>> I replaced the Flexplate with a steel flywheel about a year ago. Since then, I replaced the four rubber dampers with machined aluminum discs giving a solid connection and then dynamically balanced the system. This was done because maintaining a dynamic balance wasn’t possible with the dampers. Only a few hours of flight have occurred in this configuration so far and there has been no indication of problems resulting from this change.
>>
>> Steve Boese
>>
>>> On Jan 8, 2025, at 11:03 PM, Stephen Izett stephen.izett@gmail.com <flyrotary@lancaironline.net> wrote:
>>>
>>> ◆ This message was sent from a non-UWYO address. Please exercise caution when clicking links or opening attachments from external sources.
>>>
>>>
>>> Hi Steve
>>>
>>> Is this recent then?
>>>
>>> I’m not able to get to my aircraft at present to check my flex plate which has probably seen 50 hours of service.
>>>
>>> Was it possible to see these cracks assembled?
>>>
>>> I would appreciate your reflections on Tracys latter choice to remove the damper, and particularly when using a timber/glass prop such as an MT.
>>>
>>> It would be great to have an update and current info from Tracy regarding his no damper hours if anyone can contact him.
>>>
>>> Very helpful, thanks again Steve
>>>
>>> Steve
>>
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>
>
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