REFLECTOR: Yet another taxi test!

Wed Sep 16 06:51:26 CDT 2009

Jeff,

Yes inspection is in order and that is planned before any more go  cart
runs.  I did a quik cursory look  immediatly and it looked OK.

I upgraded to the Taco gusset nose strut a few years ago, I also
installed the XL nose pivot assembly just for grins as its way more
substantial than the STD bushing.

thanks,  Scott

Jeff Barnes wrote:
> Hi Scott,
>  
>     On #3, check your NG at the hinge point make sure no cracks on
> suppporting structure. Also, do you have latest NG from factory ?  
> Check Rich Guerra's website for 'Oshkosh Miracle' pictures and look at
> his: If yours is like that, it should be replaced.
>  
>     Congratulations on progress, and way to go in catching and
> stopping that fire. Another 30 seconds and you could've had a meltdown
> !  A lesson for us all to get out and inspect immediately.
>  
> Regards,
>  
> Jeff Barnes 
>
> --- On *Tue, 9/15/09, Scott Derrick /<scott at tnstaafl.net>/* wrote:
>
>
>     From: Scott Derrick <scott at tnstaafl.net>
>     Subject: REFLECTOR: Yet another taxi test!
>     To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
>     Date: Tuesday, September 15, 2009, 9:05 PM
>
>     Today's taxi test went way better than the last one!
>
>     82 degrees,  5-10 knot crosswind.  Density altitude 9400 ft.
>
>     After putting drain holes and drain valleys/dams in the lower
>     cowling/scoop,  cleaning things up, and fired her up for a short 2
>     minute run.  Ran well, no leaks.
>
>     Put cowling back together, whist  taking pictures.
>
>     Fired up again for an extended full throttle run until cyl head temps
>     reached 350, that was a few minutes at full throttle.
>
>     Looked like she was ready.
>
>     First taxi run was a 50 knots, no problems.  Static RPM is still
>     pathetic at 2050-2100 and it did take longer than I thought it
>     should to
>     get up to 50 knots.  I forgot how hard you have to press the brakes to
>     get any real breaking!  Got used to the 210's brakes which are mighty
>     touchy.
>
>     Turned around and got up to 60 knots, everything felt fine,  nose just
>     starting to want to fly.   Cyl head temps were around 350, oil at
>     200 by
>     now.
>
>     Pulled off taxied back to hanger and shut down.  Walked around looked
>     everything over, nothing loose, no visible leaks.  Let her sit for 20
>     minutes.
>
>     Fired back up, taxied to runway,  cyl temps 280, oil 190
>
>     Got up to 70 knots, nose coming up with just a touch of back pressure,
>     held up for 2,000 ft, coasted to a stop, oil was now at 225, cyl
>     temps 360
>
>     turned around, got up to 70 knots again, held nose in takeoff attitude
>     for 2-3 thousand ft.  oil at 240 now, cyl temps 365
>
>     Then the fit hit the shan!  After letting the nose back down, slowing
>     through 50-45 knots, nose wheel shimmy!  Wow!  I hate that! This
>     is the
>     second time I've felt in in 450 hours. I applied max brake and at
>     about
>     20 knots it stopped.
>
>     Taxied back to hanger.  I will be de cowling Thursday and doing a
>     thorough inspection  to  verify everything is OK.
>
>     3 possible problems.
>
>     1.)  high oil temps?  Should I expect that when doing these taxi
>     tests?
>     I know if I had actually taken off, the nose oil cooler would have
>     really started to work with the higher air speed...  Anybody else see
>     similar temps when taxi testing with a already hot engine?  I have to
>     say I have a fan driven secondary oil cooler which I neglected to turn
>     on until right before the last run.  Needs to be added to my
>     checklist!
>
>     2.) low static rpm.  Its not so low I can't fly, but it really seems
>     like it should be in the 2200-2250 range. I never saw higher than
>     2050.
>     I will call Catto tomorrow afternoon and see what can be done.  I've
>     already sent it back twice for tuning.
>
>     3.) Shimmy, just need to tighten the washers.  When I got back to the
>     hanger the fork was loose?  I've never had it loosen up like that
>     before?  Maybe after sitting for two years, I don't know...
>
>     Any thoughts about any of the 3 issues?
>
>     Scott
>
>
>
>
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