A few weeks ago I wrote that I had run up the engine to 4500 RPM, but that
 was not WOT. I went up and ran it today,WOT, and got the following
 results.


 Temperature today~ 70 F
 Humidity- high, maybe 80%
 RPM 5660
 MP- didn't remember to look
 Prop Catto  74 DIA x 88 pitch
 Engine 93 13BREW N/A
 Primary injectors - stock, 28 lb.
 Secondary injectors  stock 40 lb.
 PRSU RWS 2.85/1
 RWS EM2 said it was making 161 hp. at 5660 RPM
 Tail wheel was tied down, the brakes don't seem to hold at WOT even on dry
 cement.

 My induction system was not hooked up, it was configured as shown in the
 photo.
 I think, based on the above, that I might see 194 HP at 6800 RPM, which is
 2386 RPM at the prop. Anyone who can calculate this more accurately, or
 shed  more light, please go ahead and 'splain it to me.
 In any case, I'm pretty sure it will be able to get off the ground.

 The airworthiness inspection is completed, taxes are paid, and
 registration
  should arrive in the next few days. I'm still working on my tail wheel
 endorsement, I should have it by the time my instructor makes his next car
 payment, I hope. Also, trying to get some time in some tail wheel RV's.
 There
 are several people who have offered to take me up to get a feel for how
 they  fly.

 Steve Beckham and Mark Hatch graciously flew up to give the plane some
 scrutiny two weeks ago.

 So, depending on how the stars line up, This plane might be airborne by
 the
  end of the month.

 Brian Trubee

 Congratulations Brian. You are moving right along.
 For more evidence on power out you need to know the mixture
 setting and the fuel burn.

 Then you use the full rich number of .60 to divide
 the pounds of fuel burned per hour to get the full rich
 HP. Convert gallons per hour to pounds per hour by multiplying
 by 6.25.

 To get the full lean HP use the .47 number.

 Lets say it is burning 10 gallons an hour while cruising
 full lean. That is 62.5 pounds of fuel per hour. Full lean
 cruise HP would then be 62.5 divided by .47 or 133 HP.

 Another way of doing it is use a couple of race car scales
 and put one under each main tire. Bath room scale readings are not
 quite high enough unless you use a two to one levers. They are
 generally limited to 300 pounds. You need 600 pounds.
 See the attached sketch for that.

 Use a long rope from the
 tail wheel to a pickup truck to keep the airplane stationary.
 Don't tie it down as that will introduce an error in the
 scale readings due to thrust tending to pitch the airplane
 nose down. Make something out of plywood and a 4 by 4.
 Use a gate hinge to keep the top plywood in place.

 You need to know the distance
 between the mains. Run the engine up to full power and
 note the RPM. Take the difference in scale readings
 and multiply by the distance between main tires.
 That is the torque the engine is generating at that
 prop RPM.


 HP = Torque times RPM divided by 5252.

 Paul Lamar


Paul, the drawings you show for the bathroom scale will 'double' the weight
on the scale, not half it.

Bill Schertz
KIS Cruiser #4045
N343BS
Phase I testing

Thanks for catching that Bill here are the corrected pictures.

Was there any new rotary stuff at OSH this year? I could not make it
due to biz. Got any pictures you can send?

Paul Lamar