MOKI RADIAL Care and Maintenence
06-13-2016, 01:42 PM
#3776
I used a 26x18 two blade on my 180. Worked well. Had the ground RPM around 4000.
06-30-2016, 05:51 PM
#3780
My Feedback: (2)
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
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
07-05-2016, 01:59 AM
#3786
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?
Any suggestions?
07-05-2016, 07:10 AM
#3787
My Feedback: (62)
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
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.
07-07-2016, 11:08 PM
#3789
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
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
07-08-2016, 12:51 PM
#3791
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.
07-11-2016, 12:56 AM
#3793
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.
07-18-2016, 05:29 PM
#3794
My Feedback: (12)
Join Date: Sep 2004
Location: san pedro sula, HONDURAS
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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
Thanks in advance
07-28-2016, 09:52 AM
#3799
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Join Date: Jun 2011
Location: Espoo, FINLAND
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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
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
07-28-2016, 04:12 PM
#3800
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
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
