Wondering what fuel consumption I should figure for a stunt run. I'm going with the K77 but I figure they should be close.

HI Chuck

Most people  use  7  7.5 ounces, 98% of most everyone using the  PA 75 run under  8 ounces, a few  use  8.5 ounces, will depend on plane size/drag  and  setup you go with, props  will also have some effect.

randy

Per Kaz's web site:

I use 10 to 15% nitro 20 to 22% all synthetic oil fuel
I use 230cc(8.1oz) tank for pipe and 180cc(6.4oz) tank for rear muffler.
You can use the same propeller and fuel as for PA75.
Tuned pipe 12.2 x 4.5 to 5.2 3B 9000 to 9600rpm
So far pipe length (plug to #1 baffle) is 455 to 460mm in my case
Rear muffler 12.0 x 5.2 to 6.0 3B 8700 to 9300rpm
Prop for rear muffler should be 0.5inch smaller than the prop for pipe.
You can determine the prop is too big for the engine if rpm increase in air.
Pipe create more power than the rear muffler.
When you use the rear muffler, I recommend "No baffle" muffler.
And It is highly recommended to use muffler pressure.

Chuck, you're right, build the tank. I have the same situation with the K-77 powered Thunder Gazer that I'm building. I'm planning on having to make it 1.25 deep to get the extra volume (I need to find my notes just to make sure). You should be able to figure the location of the uniflow without too much trouble.

hi  many  buy  or make  a  7 to 8 ounce  metal tank
some  add a sump  to the  7 oz metal  tank ( 5.5 in long)
or  some run  8 oz  plastic  tank plumbed  uniflow  or  Billy  uniflow

Randyu