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MOKI RADIAL Care and Maintenence

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MOKI RADIAL Care and Maintenence

Old 06-13-2016, 01:42 PM
  #3776  
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Originally Posted by husafreak
That is great news, the 180 should fit fine then.

FWIW at the Castle show a couple of the guys running 250's said they liked props pitched at 20 for flying. They didn't know what to put on a 180 but they wanted me to realize how high of a pitch they were running.
I used a 26x18 two blade on my 180. Worked well. Had the ground RPM around 4000.
Old 06-19-2016, 04:56 PM
  #3777  
David Jackson
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Originally Posted by LRFitch
An additional question: Does anyone know of a source for a 30X18 or 32X16 three-bladed propeller? I've looked at several internet sites, and not found anything near those sizes.

Thanks,
Larry Fitch
If you haven't done so, try Vogelsang.
Old 06-20-2016, 03:39 AM
  #3778  
flyn2high
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Originally Posted by LRFitch
An additional question: Does anyone know of a source for a 30X18 or 32X16 three-bladed propeller? I've looked at several internet sites, and not found anything near those sizes.

Thanks,
Larry Fitch
Try Aircraft International and look at the Bilia props.
Old 06-22-2016, 06:37 AM
  #3779  
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Lou/David,
Thanks for the help.
Larry
Old 06-30-2016, 05:51 PM
  #3780  
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Hello,

Question please. Looking to try a 34 x 16 Fiala on the Moki 250.
Can anyone give an account of the RPM range with this combination - and if the prop is suitable for the engine?
I recently tried a Biela 32 x 22 and found it loaded the engine and plane too much for my flying style.
The best prop I have used to date is the Xoar Laminated 32 x 18.

Thanks - Jaketab
Old 07-02-2016, 05:42 PM
  #3781  
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Is it imperative that the 180 have a baffle in a Hellcat?
Old 07-02-2016, 05:45 PM
  #3782  
AC2
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Originally Posted by husafreak
That is great news, the 180 should fit fine then.

FWIW at the Castle show a couple of the guys running 250's said they liked props pitched at 20 for flying. They didn't know what to put on a 180 but they wanted me to realize how high of a pitch they were running.

Husa, what kit are you going with?
Old 07-02-2016, 08:09 PM
  #3783  
David Jackson
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Who is providing service for the Moki in the USA?
Old 07-03-2016, 01:38 PM
  #3784  
Greg Wright
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Julian Mashburn is your guy..

http://jmengineworks.com
Old 07-03-2016, 01:41 PM
  #3785  
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Originally Posted by AC2
Is it imperative that the 180 have a baffle in a Hellcat?
I feel it is important that you do baffle the Moki engines..
Old 07-05-2016, 01:59 AM
  #3786  
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Hi, I flew my P47/moki250 last weekend. This was after almost 8 months. After starting up and warming the engine I got a Idle rpm of 850 and top end of 3825. I did not tweak the needles at this time. I assumed this was good to go. I had a 8 min flight and just as I deployed gears and flaps for landing, I could feel the engine losing power. I throttled back to almost idle and nursed the plane back safely. I found that the idle had increased to 1250 and the engine would not go above 20% throttle... it wanted to lean cut. Let me add the weather conditions at the moment are hot and humid. During my last flight on this engine, it was cooler and not humid. Could the weather have caused the engine to over rev and get lean? I use the emcotec HV pump. The engine was quite hot as well. I am almost certain, that I need to either richen the needles, or increase the pitch. I use the Carf models 30 inch carbon blades and the needles are as per manual. H=1.75 and L=1.25. Fuel used is 40:1. Thankfully the engine seems to be structurally sound with all push rods in place. The exhaust manifold nuts became a quarter turn loose. As always. I spray wd40 after every flight and open up the cowl to check every 3 flights. I don't know what I am doing wrong.

Any suggestions?
Old 07-05-2016, 07:10 AM
  #3787  
Maxam
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As the temperature rises the engine will become more rich due to the lesser density of the atmosphere. Sitting that long, the carb could be gunked up some. This is not always the case but the fresh gas in the carb will soften the gunk and the engine will then run properly again. Take the cowl off and run on the ground for a short period. If it starts to run properly again you MIGHT be OK. If not the screen in the pumper side of the carb could be clogged or a fuel filter if you are using one. Take your time as this type of event is somewhat common. I am happy your plane is safe!
Another thought, is your engine baffled? If not it could have over heated some due to the higher temp but the increased idle says otherwise (I am saying overheating due to a lean condition). The proper setting of the idle screw will allow the engine to run slowly like your original idle speed of 850. The engine will speed up on the idle if it becomes leaner but it will be on the verge of quitting. This would indicate a fuel issue like I originally mentioned. -tom

Last edited by Maxam; 07-05-2016 at 07:15 AM.
Old 07-05-2016, 09:28 AM
  #3788  
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Ragz,

Sounds like possibly overheating.
Do you have pictures of the front and exit area of your cowl to show the airflow through the engine?

Jaketab
Old 07-07-2016, 11:08 PM
  #3789  
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Thanks for the comments guys. Much appreciated. I have opened up the cowl and will give it a thorough check. Yes my engine is completely baffled. Pic attached.

The engine has only had about a gallon and a half of fuel through it. What should be my needle settings? Should I use the needles to get the desired max ground rpm or play with the pitch (which is going to be a pain). Andreas Gietz has asked me to set up a max ground rpm of 3800 for this airplane... (carf p47) and in the past 4-5 flights its worked well. Although I have always felt the engine leaning out on top of a loop. I assumed it was ok, but now I'm beginning to wonder if I have a lean engine since day one.

Thank you.



PS: The wing canons are reversed in this pic. I have fixed them now
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Old 07-08-2016, 11:22 AM
  #3790  
Maxam
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On the high speed needle, adjust for max rpm then back off (toward rich) 1/8th turn. If it is leaning in a loop then like any engine, richen some!
Old 07-08-2016, 12:51 PM
  #3791  
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Follow what Maxam said and also increase your pitch to bring maximum ground RPM down to 3300-3500. 3800 is too high. I know from telemetry, 3800 on the ground will allow the engine to hit 5000 RPM and you don't want or need that kind of RPM.
Old 07-09-2016, 07:47 AM
  #3792  
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Originally Posted by Growler84
... I know from telemetry, 3800 on the ground will allow the engine to hit 5000 RPM and you don't want or need that kind of RPM.
What telemetry system/sensor are you using? I have and use telemetry on all my engines except my Moki. Would love to monitor RPM and temps.

Cheers
Old 07-11-2016, 12:56 AM
  #3793  
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It's the Spektrum telemetry stuff. The RPM sensor setup was a bit painfull to get aligned propery but once done it worked pretty good. I find the Spektrum telemetry in my application tends to drop out quite a bit during flight. So once I learned what I wanted about the model's performance I took the telemetry out.
Old 07-18-2016, 05:29 PM
  #3794  
totono
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Hi gays I am new here and jus got a Moki 150 can some one help me with some basic information on that particular engine, max rpm ,prop zise, oil mixture 50:1/32:1 my engine it is used not brand new and basically I am in to turbines not gas engines I know the basics thats all
Thanks in advance
Old 07-23-2016, 02:07 PM
  #3795  
badangle
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Hi Guys
new 180 in box...
contact me
Old 07-23-2016, 05:56 PM
  #3796  
badangle
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Tried to put it in buy/ sell but I couldn't
Old 07-23-2016, 07:14 PM
  #3797  
AC2
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I sent u PM
Old 07-24-2016, 09:48 AM
  #3798  
badangle
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engine off market..sorry for any inconvenience
Old 07-28-2016, 09:52 AM
  #3799  
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Hello,

Here's test flight with my 120" Don Smith Corsair and Moki 250. The prop is a 32" "solo prop" from CARF models with carbon blades. The pitch is set to about 23" calculated from the blade angle at a given distance from the center. It revs on the ground 3940 rpm and unloads in the air in a shallow dive to 5940 rpm.

http://jarkko.pictures.fi/kuvat/f4u_...t/IMG_1934.MOV

Hope it works, you'll see wing folding in the end

Jyrki
Finland
Old 07-28-2016, 04:12 PM
  #3800  
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Originally Posted by jairaksinen
Hello,

Here's test flight with my 120" Don Smith Corsair and Moki 250. The prop is a 32" "solo prop" from CARF models with carbon blades. The pitch is set to about 23" calculated from the blade angle at a given distance from the center. It revs on the ground 3940 rpm and unloads in the air in a shallow dive to 5940 rpm.

http://jarkko.pictures.fi/kuvat/f4u_...t/IMG_1934.MOV

Hope it works, you'll see wing folding in the end

Jyrki
Finland
Wow that is a nice looking plane and very fast... sounds like it might be over reving a little bit. Be careful not to over rev that Moki. They don't like it

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