[NSRCA-discussion] Question - YS140DZ

[adriancwong at earthlink.net]

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
>