Monday, May 04, 2015

Not So Fast

Took a little trip up to visit my daughter yesterday and thought I'd check performance.  Not good enough.  I seem to have lost about 4 mph, I used to top off around 211 TAS.  Unfortunately, there  are all sorts of variables, the new canard, new overhaul of the engine, not the identical angle of incidence as the old one, new shape wheel pants, completely different prop, etc., so it's difficult to ascertain where the problem lies.

One thing I think I need to look at is the prop speed.  With the old setup I would turn about 3,100 RPM.  Intentionally, we set the new one to top around 2,800 RPM, but with a steeper pitch.

There are some unfinished items on the rebuild.  It needs a good wet sanding and buff, and I need to fabricate the covers that hide the exposed elevator torque tube on the under side of the canard.  I also need to better tweak the mixture and will be installing a new O2 sensor to aid with that.


7 comments:

Unknown said...

Hi Sam,

I am starting to work with Bob Nuckolls to design my electrical system. Looking at your switch panel, I can see Bob's indirect influence there, can't I?

I like your speed

Cheers,
Jay

Sam Hoskins said...

Yes - Heavy Bob K influence. Did you buy his book? Mandatory reading. It wound up being a fairly complex system and I really worked hard to reduce the number of switches. I think it's a good system though.

Unknown said...

Yep, Got his book and read it a couple times (does not mean I really understood it well). In any case, trying to optimize using some of Bob's prior designs. Will keep you posted.

David J. Gall said...

Sam, your performance is excellent! You're running 300 fewer revs so you're making less HP. To only lose 4 mph tells me you've gained efficiency with the rebuild. Truth will be revealed in your fuel burn numbers. Keep up the inspiring good work!

Unknown said...

Hello ... Sam:
My name is Bernardo Pastor and am a member of QBA, I'm building a Quickie Q2, I'm following the instructions for building LS1, according to Dan and you explain yourself.
I have doubts as to the apex sand stringers carbon fiber. Where sanded? ...
Another question regarding the brakes:
  1. Is it better wheel "crazy" tail and no differential brakes? ... Or
  2. Is it better to address tail wheel and differential brakes? ....

Thank you very much in advance .... Your information is very useful to me.
Sincerely, Pastor Bernardo.

Unknown said...
This comment has been removed by a blog administrator.
Sam Hoskins said...

Use differential brakes.