[NSRCA-discussion] Question - YS140DZ

[adriancwong at earthlink.net]

Backplate usually is not the problem, it's the surface of the drive washer.

I put a piece of very rough sand paper - belt sander grade - cut to the shape of drive washer between the two surfaces to prevent slipperage.

-----Original Message-----
>From: Lisa & Larry <lld613 at psci.net>
>Sent: Jun 2, 2008 7:53 PM
>To: adriancwong at earthlink.net, 'General pattern discussion' <nsrca-discussion at lists.nsrca.org>
>Subject: RE: [NSRCA-discussion] Question - YS140DZ
>
>Mis read your question...Sorry...
>
>I didn't take the prop off to verify that backplate was not stripped. It was
>a new backplate and prop...So I didn't suspect it...That could be a
>possibility, but I checked the prop and it wasn't loose after each event,
>that I could tell.
>
>-----Original Message-----
>From: nsrca-discussion-bounces at lists.nsrca.org
>[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of
>adriancwong at earthlink.net
>Sent: Monday, June 02, 2008 6:47 PM
>To: General pattern discussion; 'General pattern discussion'
>Subject: Re: [NSRCA-discussion] Question - YS140DZ
>
>Larry,
>
>Did you check the drive washer to make sure the surface is not stripped
>causing the backplate to slip?
>
>Adrian
>
>-----Original Message-----
>>From: Lisa & Larry <lld613 at psci.net>
>>Sent: Jun 2, 2008 7:41 PM
>>To: 'General pattern discussion' <nsrca-discussion at lists.nsrca.org>
>>Subject: [NSRCA-discussion] Question - YS140DZ
>>
>>Ran the engine at home about three weeks ago and perfect idle, midrange,
>and
>>full throttle... 
>>
>> 
>>
>>I went to the field Sunday to maiden my Titan?Started as it usually does,
>>and while it was at idle I adjusted the transmitter to get it dialed in
>>after my Tx repair / reprogramming. This took about 15 to 20 seconds?Let it
>>warm up a little longer and then slowly increased rpm?About ½ throttle on
>>the stick, somewhere between 5,000 and 7,000 RPM I heard a low freq buzz
>>(sounded like an electric motor burning up?vbg)?shut it down and found that
>>the spinner loose (new spinner, new prop APC 16 x 11). This is the set up I
>>have flown with this engine for 3 years?
>>
>> 
>>
>>Tightened up the spinner making sure the prop was tight and started again
>>and got a DZ bump?nicked spinner, not bad?Tightened everything up again,
>>started nice idled well, then transitioned to full throttle. Again at half
>>throttle, it popped, quit, and shavings of prop flew every where. It was
>>violent. The spinner is bent worse than I ever saw before by anyone?The
>prop
>>was intact except for the missing chunks at the hub where it hit the
>>spinner.
>>
>> 
>>
>>Starting procedures and equipment:
>>
>> 
>>
>>Radio South Starter with on/off switch in the off position, using a Kavan
>>starter turn the prop and then turn on the Ni-starter. Temperature was
>about
>>20 degree warmer on Sunday than the initial test run. Used the same fuel
>>from the same can, Power Master 30% DZ
>>
>> 
>>
>>Three weeks ago it was running a bit on the rich side and I didn?t touch
>>anything until Sunday when I intended to lean it out?Never got that far.
>>
>> 
>>
>>What did I do wrong if anything? What can I look for in the engine to
>repair
>>or correct myself or looking at?
>>
>> 
>>
>>Or do I just send it in to YS Performance?
>>
>> 
>>
>>I have a back up 140DZ and bought the last FAI 3-¼ TT spinner w/ light
>>backplate at Central?vbg?
>>
>> 
>>
>>If I made a mistake, I don?t want to repeat it.
>>
>> 
>>
>>Your thoughts? Troy you out there?
>>
>> 
>>
>>Larry Diamond
>>
>
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