Nice work Neil.
I understand why the price has to be so
high for such relatively simple parts. The work behind the
scenes is enormous and has to be spread between so few units.
I may have missed this detail before. What
kind of surface does the splined part have to insure grip on
the rubber?
Tracy Crook
Sent from Mail for Windows 10
Joe,
Only mine which has survived to date
without mishap. The testing I
did was to destroy a sample of various
"cushion / flex material on the
bench. This involved clamping a unit in
the vice and then twisting the
inner with my son-in-law, who weighs 110
KG, on the end of a 6 foot
length of pipe. In theory that was in
excess of 600 ft pounds and the
rotary produces 300 ft pounds. THen the
testing in my glastar which was
ideal as I was fitting and tuning a new
fuel tech ECU. The backfiring
and rough running certainly tried
everything out.
Neil.
On 11/10/2018 6:22 AM, Joseph Berki
jskmberki@windstream.net wrote:
> Neil,
>
> Are there any cushion drives flying?
> Any testing performed?
>
> Joe Berki
>
> -----Original Message-----
> From: Rotary motors in aircraft
<flyrotary@lancaironline.net>
> Sent: Wednesday, November 7, 2018 3:02
PM
> To: Rotary motors in aircraft
<flyrotary@lancaironline.net>
> Subject: [FlyRotary] Re: Flexplare
Replacement
>
> joe,
>
> Just unbolt the
old flex drive, and bolt mine on.
>
> Neil Unger.
>
>
> On 11/7/2018 9:10 PM, Joseph Berki
jskmberki@windstream.net wrote:
>> Neil,
>>
>> Are there any modifications to the
RD-1C hardware using your solution?
>>
>> Joe Berki
>>
>> -----Original Message-----
>> From: Rotary motors in aircraft
<flyrotary@lancaironline.net>
>> Sent: Tuesday, November 6, 2018
8:02 PM
>> To: Rotary motors in aircraft
<flyrotary@lancaironline.net>
>> Subject: [FlyRotary] Re: Flexplare
Replacement
>>
>> Marc,
>>
>> Attached photo
is of the original mounted on my engine, The unit shown has
urethane as the "flex" which lasted about 5 hours and the
spacer is the original without excess material milled off for
lightness. Input shaft is Tracy's whereas mine is one piece
and a lot dearer!! Basically as shown the plate with the
vulcanised drive block is bolted through the spacer and
flexplate onto the e shaft as shown and is lighter than
Tracy's but by how much I forget. Made specifically to
retrofit all Tracy's reduction drives.
>>
>> Neil Unger.
>>
>>
>> On 11/7/2018 10:12 AM, Marc Wiese
cardmarc@charter.net wrote:
>>> Neil,
>>> Can I see a sketch of how it
all fits together front to back?
>>> Marc
>>>
>>> -----Original Message-----
>>> From: Rotary motors in
aircraft <flyrotary@lancaironline.net>
>>> Sent: Tuesday, November 06,
2018 3:28 PM
>>> To: Rotary motors in aircraft
<flyrotary@lancaironline.net>
>>> Subject: [FlyRotary] Re:
Flexplare Replacement
>>>
>>> Joe, There is another way
which is my cushion drive (attached) which will cost approx
$500 USD plus freight with the current exchange rate. Main
cost is the splined drive block so that it matches up with
Tracy's splined input shaft. The photo shows the 2 parts of
the unit, spacer and splined cushion drive, which bolt direct
onto the e shaft with the normal flexplate in between. Uses
the normal flexplate with no strain whatever on the
flexplate. Your money and your decision!!
>>>
>>> Neil Unger
>>>
>>>
>>> On 11/7/2018 6:06 AM, Jeff
Whaley jwhaley@datacast.com wrote:
>>>> Hi Joe, I believe there
are two ways you can go, though I don't have part numbers or
exact details for you:
>>>> 1) Tracy's Method: Use an
aluminum flywheel directly, including the center spline
coupling - this eliminates the damper plate and the need to
drill holes. The catch is the spline does not match the
original RD1-C prop shaft spline.
>>>> 2) Dave Leonard's Method:
Use an aluminum flywheel, no center spline, mount the damper
plate, remove material from one face to adjust ring gear
position relative to starter.
>>>> A quick search of the list
should get you more info as it was discussed lately ...
>>>> Jeff
>>>>
>>>> I have been looking at
various flywheels for possible candidate replacement.
>>>>
>>>> I thought the aluminum
units would provide the least amount of weight gain.
>>>>
>>>> I noticed that there are a
lot of holes in these units including the replaceable friction
area with many screw holes.
>>>>
>>>> I was under the impression
that the holes in the flexplate promoted stress cracks.
>>>>
>>>> These flywheels however
may have sufficient material to counteract the stress
potential.
>>>>
>>>> Can someone provide a
brand or part number that is acceptable?
>>>>
>>>> I believe that the
additional machining to modify one of these flywheels is the
holes for the torsional damper.
>>>>
>>>> Thanks for any help.
>>>>
>>>>
>>>>
>>>> Joe Berki
>>>>
>>>> --
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http://www.flyrotary.com/
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