Moki 2.10
 

8100 rpm (on new engine after 1 gallon)

Using an APC 20x8
Original Moki plug
5% PowerMaster Fuel
75F Air Temp
approx 65F Dew Point

Mounted on Aeroworks Edge 540 29% kit

Moki 2.10
 

Muffler??

Moki 2.10
 

Bisson Pitts style

Engine still running great. Having tached it lately.

Moki 2.10
 

Excellent numbers!

Thanks.

Moki 2.10
 

7500 on a 20X10 Zinger with 0% Nitro home brew. Bisson pits muff. Well broken in on a TF P51.

Moki 2.10
 

Bambula 20/8 prop
pitts muffler, Bisson
No nitro, 15 % oil

6600 RPM

Motor is still being broken in so I hope for improvment.

tony

Moki 2.10
 

Tony ,

That number sounds real low but I do know it takes many gallons of fuel to break in the moki. Give it time and try different manufactures of props until you find what works for you. Also I believe Moki recommends 20% oil. Maybe this is also an issue. All I know is that you have one bear of an engine. Hang tight.

Jim

Moki 2.10
 

JIm;

Thanks for the encouragement. I have two of the Moki 180's and they are both stronger then the 210. Of course the 180's are old and the 210 is new Sooooooo I am being patient.

tony

Moki 2.10
 

20% oil will choke a Moki, After a decent break-in run 12-14% oil.

Moki 2.10
 

Has any one tried a larger diameter prop? I'm using a Mejzlik 20 x 10 on my Moki and it turns about 7500 at sea level with no nitro. The plane flies okay, but I want more thrust and down-line braking. With the 20 x 10 I have way more speed than I need and the throttle response isn't great. I believe the Moki 2.10 reaches peak torque at about 7500 rpm. That's where I want to be at full throttle on the ground. If you've used a larger diameter prop, could you tell us what it was and how it worked (full throt. rpm on the ground)? Thanks.
Woody in Maryland
P.S. I'm now running a Perry Pump. It seems to help with consistent mixture no matter the plane's attitude.

Moki 2.10 Setup
 

You shouldn't need a Perry pump. The main thing with a Moki running consistently is fuel draw, and like the directions recommend, if you use large ID fuel line from the CLUNK to the carb you won't have any probs. Also, make sure the fuel tank height is per the instructions, especially if you are having consistent running problems at various attitudes.

Moki 2.10
 

RH, Thanks for the information. Everything was set up correctly before I installed the pump - large ID tubing from large ID clunk to carb and the tank was positioned correctly. The engine used to go lean on up-lines, so I had to richen the main needle to prevent this. I then had a crappy midrange. The front edge of the tank is 14" from the back of the carb. With the pump, the mixture settings don't change and I have much better throttle control. What prop do you use?

Moki 2.10 Prop
 

I'm using the APC 20x8. Others have used the APC 20x10 with good success too. See earlier posts for my tach readings. With the 20x8 vertical is unlimited, but more importantly straight line speed is good for IMAC. I'm in San Antonio, Texas ~400(?) above sea level with usually high dew points and high air temps.

Moki 2.10
 

Moki 2.1 on Omega 10%, OS F type plug and 20x10 Menz 'S' prop.........6800 rpm max after two gallons. I'm assuming these numbers will improve with further running! RollingHoover FYI ..... correction, San Antonio is ~650 feet MSL.

:cool: JMW

Moki 2.10
 

Guys, I tried a Bambula 20 X 8. Compared with my Mejzlik 20 X 10, I have much better down-line braking (much better) and vertical up-lines are much stronger. On the ground I got 7020 rpm. The temp was about 90 deg F with very high humidity (70%?) at sea level.

Moki 2.10
 

Staggerwing;

How much stronger is your vertical with the Bambula 20/8?

tonyc

Bambula 20x8 prop
 

Staggerwing, what airframe is that in and what is the weight?

jmw

Moki 2.10
 

tonyc, what prop are you currently running and what airframe/weight are you using? Is that 2.1 turning up any more rpm as you get more run time on the engine? I am hitting about 6800 max on a Menz 20x10 after about 2 gallons.

jmw

Moki 2.10
 

I fly a Lanier 80" Cap 232. I'd guess it weighs 16+ pounds. The Bambula 20 X 8 noticeably increases the vertical up-line pull, but I won't try to hover - not enough excess thrust for that. It will climb straight up a few hundred feet (400-500?) before it runs out of steam if I enter the pull-up with speed at full throttle. To me, the plane flies very scale-like. In fact, a guy at the field used those words to describe its flight characteristics. The plane is way too heavy to hover with any authority. The biggest difference is in the braking. This prop really slows it down. For an aerobat, speed isn't necessary. The Bambula pulls the plane well. Woody

Moki 2.10
 

At 16 1/2 lbs you'd think that Moki would blast that CAP out of a hover but I am starting to think all the hype about the 2.1 putting out 25 lbs+ of thrust on a 20x10 prop is a lot of hype. I have mine in a 14 1/2 pound GP Patty Wagstaff Extra 300 and although it has good vertical it's still not where I thought it would be. A quick check with a digital scale showed just under 20 pounds of thrust with a 20 x10 Menz prop. To be fair to Moki though this was after only one hour of run in time so it may improve. What are you guys getting for thrust?

jmw

Moki 2.10
 

I agree. Although I have no way to measure static thrust, I'm sure I'm not getting 25 lb. According to Gerard's information, the engine should be proped to run at 7000-8500 rpm on the ground. Does this suggest the engine achieves maximum torque within that range? I'd like to do some more experimentation, but at $15+ per prop, I'll hold off for now. I have enough performance to do IMAC type of maneuvers and I now have down-line braking...something I REALLY wanted. Ideally, I'd like to dyno the engine to see exactly where it reaches peak torque and then prop accordingly. I bought my engine used on the plane, but it runs and idles so well that I feel it was broken in properly. I wonder if I could get away with something like a 22 X 6? Do you like your Patty? I saw a full-scale Extra fly for the first time last weekend and fell in love with them. Try a 20 X 8 in the Menz and see what you think. I never noticed a change in top speed (something I rarely do anyway) after changing to the 8 from the 10.

Moki 2.10
 

Mejlick 20x9 = 7800rpm
1.5 gallons of byron 0% through it.
K&B1L Plug.

Bambula 20/8 6400 rpm
 

I just started the 4th gallon of fuel.

No nitro, 18 % oil (added some more castor)
91 degrees, 53 % humidity

6400 rpm. :confused:

Flying an Ultra Hots, weight is 15 lbs.
Vertical is good but not unlimited.

I think I am about 800 to 1000 rpm low. thats a lot of ground to make up in the next few gallons.

I will try a Bambula 18/8 prop to get the rpm's up for a couple of flights.
I also have a Moki 20/10 prop on its way to me.

But so far my Moki 180 is better.

tonyc

Propped for a warbird
 

I have an APC 18x12 on a Moki 2.10 turns 8500rpm on the ground with an ambient around 85degrees. Using Performance Plus 5%nitro with 20% oil and OS F plug. Large fuel line and no pump.
This combo powers a WM GS P-51D at 16# 12oz
Have about 3 gallons through it so far.

18/8 Bambula 7600 rpm
 

I just did a couple of flights with an 18/8 Bambula. So far all I am getting is 7600 rpm on the 18/8. I even tried an APC 18/6 wide prop, the Moik hit about 7860 rpm. :(

My Moki is off by about 800 to a 1000 rpm.

I have a Moki 20/10 prop on its way to me. This is the Gold standard prop for this motor. With this prop I should see 7500 rpm. No Way, I would say.

After I try this prop, if the rpm is low, I will box up the motor and let Gerard Enterprise have a look at it.

I have two of the Moki 180's and both are stronger then the 210.

tonyc