Fuji .05 ABN Engine from MECOA

Yeah...figure I'll see what I can get out of it. Got to search a little more on the break-in procedure. Don't know whether to light it up and let'r rip, or work it in a like a Babe Bee.

Thanks Kris !

With the Ringmaster painting on hold 'till some dryer weather shows up, I was able to get the Fugi on a stand and put in a couple of runs this morning before being chased inside by thunderstorms.

True to what Kris said, it peaked at around 13 or so on a gray 6-3 and without it's muffler. Of course, we got a little more running to do, so it may pick up a bit as we go. Sort of a pretty engine.

Yeah...gonna see how it idles next. Probably just as well that it DOESN'T turn up too fast...considering the size of the hole I had to drill out in the hub to get the prop bolt to fit !

Update on the Fuji engine:

The .05 car engine requires thinner airfoils / low weight props as the power
of the stock engine's ability is in it's top end rpm.



HQ Prop 4x4.5  / Idle 9.3k rpm  / 28,746 rpm / 122.4 mph pitch speed
.197hp / 147w / Tuned Pipe's MRP (mean reflective point) set at 8.8in / 31k rpm.  
If at 32.5K unloaded 140 mph potential down wind awesome set up for a
.05 converted car engine short med/hot glow plug
30%  Nitro / 72F  room temp.

Test flight:


Best pass 36,747 rpm gives a 157 mph pitch speed from the HQ 4x4.5 prop
Per audio tach from brief bursts of rpm past camera within the apex of the pass.
Per Doppler wave analysis: 238 kmh / 148 mph best pass. Speed from down wind
shallow dives gets the rpm / speed up. Prop is a bit small into the wind or when
pushed in steady banking turns. Peak speed is brief average speeds lower.
Wing is 106 sq. in.

HQ 5x4.5 speed tip prop for best thrust / speed ratio.
Static 25,355 rpm / 17.63oz /108mph Pitch Speed / .33hp / 246w
32,079 rpm / 137 mph. (per prop calc) 2nd best was 31.8k

Alternative a APC 6x4N back cut and reduced dia. down to 5.5x4 for static thrust close to 21 oz.

Thank you gents!  
I wanted to encourage the use of the engine is the idea. Many had bought the engine
in the early days when it first came out only to abandon the use of them as traditional
props did not yield good results. Kris has done some good work on improving the engine
as well and may chime in with his results.

There are good use options without the need of a tuned pipe:

The stock muffler sounds great with it here is a test of whats possible using a pressure tap.
Small props are safe with the Picco if you can avoid boinking the engine in the ground during
landings. I have two custom made cranks for the engine now and results are better than stock.
Here is a stock engine being tested:


Picco P-0 .05 / .85cc  APC 4.2x4
26,570 rpm / 101mph static - Muffler from Mecoa Fuji engine.
AP .09 carb used. 25% nitro / castor / synthetic mix
Run up after 2.5oz break in time.

Here is a low weight alternative using a Sportwerkz car header I cut it right after the turn
to have the exhaust concentration go straight down works great with a pressure tap.
The bend helps to add a bit of back pressure for the tap and keeps the sound level reasonable
compared to open exhaust but is still a bit loud - not as bad as a open exhaust TD.



Sportswerks .05  / HQ Carbon mix 4x4.5 / 26,586 rpm static
8.15oz thrust / 113.3 mph / 116w NV set rich by 1/2 turn.