Well guys

It dosen't look as though we are going to get many quesses on the speed thing so:

Flat and level entry to a speed run 96mph flat out with retracts retracted.
Flat and level entry to a speed run 81mph flat out with undercarridge dangling.

Now that supprised me I did not expect the undercarridge to make that much difference to the parastitic drag of the airframe.

I also tried a dive into the speed course on the radar gun it was doing 120mph and I chickened out and did not complete the course, I am going to change the push rods to the elevator and rudder to closed loop and then try again.

Mike