REFLECTOR: Static RPM

[Michael Watson]

Brian,

While I had the prop apart, I checked the worm gear and and spool. They
seemed OK and rotated smoothly from
one end to the other. I lightly coated the worm gear with Amsoil lite
synthetic grease then reassembled. I think part
of my problem is too much voltage drop across the long wires to the slip
rings. Fully charged battery, engine off,
moving from center only 11.5 volts at the rings. As the blades approach
either extremes, voltage drops to 9.3 volts.

John,
Thanks for the link. I will order a pair of springs tomorrow.



On Sat, Oct 29, 2011 at 7:48 PM, Brian Michalk <michalk at awpi.com> wrote:

> **
> I have seen acme screw damage from the spool on the IVO system.  The
> problem is that the thread lands were not dressed up, and "cleaved".  I
> don't know what other word to use to describe it.  The end result was that
> the spool acme threads in the spool tended to cut into the rod threads
> under load.  This resulted in a small ridge on the rod threads that was
> visible.  Over time, when the spool was under load, it would bind up and
> not go to full fine pitch.
>
> The acme threads should be nice and smooth.  If they have ridges, you may
> be having this problem.  If you have the prop apart anyway, I suggest
> taking the spool off and make sure the thread lands are free of defects.
> If not, get the Dremel out and dress them up.
>
>
> On 10/29/2011 06:11 PM, Michael Watson wrote:
>
> Hi John,
>
> Thanks for the response. Today I dismantled the prop and found that while
> the plane was being repaired at Velocity,
> they placed 3 washers on the fine pitch side and one on the course side. I
> originally had one on the fine pitch side and
> 3 on the course side. After correcting the problem and reassembling the
> prop, I now get 2500 rpm static, that's a 150
> rpm increase. On the ground, engine off my prop has never stopped abruptly
> to fine pitch, It always sound as if it's straining to a stop.
>
> BTW, where did you get the stronger spring for the motor brush. Even with
> the new springs and brushes from IVO, I'm
> still having problems reducing the rpm if it's over 2550. Have to reduce
> power, adjust, then increase power.
>
> On Sat, Oct 29, 2011 at 10:41 AM, <aminetech at bluefrog.com> wrote:
>
>>  Mike,
>>
>> Are you sure you're getting full fine pitch travel?  The only time my
>> static was reduced was when the motor was a bit weak.  You can check for
>> this in 2 ways.  The current draw is normally 2-3 amps and should spike to
>> 8-10 if the travel limit is reached.  If you aren't reaching full fine
>> pitch, the amps will go to 0.  Also, on the ground with engine off, you can
>> listen to the motor when adjusting for fine pitch.  It should stop fairly
>> abruptly.  If it gradually dies out, then you may not be reaching full fine
>> pitch.
>>
>> John
>>
>> --- mikewatsspg at gmail.com wrote:
>>
>> From: Michael Watson <mikewatsspg at gmail.com>
>> To: Reflector <reflector at tvbf.org>
>> Subject: REFLECTOR: Static RPM
>> Date: Fri, 28 Oct 2011 19:11:58 -0400
>>
>> To all Franklin /IVO  drivers,
>>
>> What is the maximum static RPM you are seeing before brake release on
>> takeoff?
>> This is with prop set to maximum fine pitch, throttle full forward.
>>
>> I used to see 2475 RPM but of late, it is has dropped to 2350 RPM.
>>
>> --
>> Mike W.
>> 1997 Velocity Elite RG
>> Franklin /IVO Electric CS
>> Dual GRT EFIS HX Synthetic Vision
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>
>
>
> --
> Mike W.
> 1997 Velocity Elite RG
> Franklin /IVO Electric CS
> Dual GRT EFIS HX Synthetic Vision
>
>
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>
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-- 
Mike W.
1997 Velocity Elite RG
Franklin /IVO Electric CS
Dual GRT EFIS HX Synthetic Vision
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