samparfitt

My Feedback: (43)

I'm 'old corps' but nothing wrong if you use 'em: no right or wrong in what a person likes.

Sam

AC2

My Feedback: (34)

I know a Gyro will not stop you from dumb thumbs , nothing will... but it cant hurt... I would think.

Greg Wright

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All i will say is a gyro doesn't correct any wrong inputs that you make.

Until you fly something that is set-up properly with one in it some people just won't understand how good a plane can feel.

samparfitt

My Feedback: (43)

My friend Scott says the cortex are the best and easiest to set up.
Not cheap but probably don't want to go cheap on a multi thousand dollar airplane!

If I did use them, it would be nice for some of the fields that I fly at where the flight line is really close to the runway. Those other fields where the runway is 200' wide, even I can take off :[]
It makes a pilot that has trouble keeping a 'tail dragger' straight, especially on a hard surface, look like a pro.

http://www.dreamworksrc.com/catalog/...yro-Fixed-Wing

Sam

AC2

My Feedback: (34)

Greg, perfectly said, all I will add is that for me the nerves just thinking of a 4K engine in a plane I am flying will distract me from flying...maybe a Gyro will help me relax lol..

Its settled in my mind, I will get one and I was looking at the cortex Sam so thank you for that info.

AC2

My Feedback: (34)

Well, step one, got the Hellcat ordered... Moki 180 here I come! (starting a separate banking account for the Moki)..... probably get it ordered in a few months..have two birds in line first.

BTW, been wanting a Hellcat for many years, took the sound of a Moki to make it happen lol.....

JK13

Agree +100!

Just give em a few years to catch-up!



Joe

Greg Wright

My Feedback: (6)

Now back to the regularly scheduled program!!!!

Enough on the Gyro's this thread is about the Moki Radial...

And i'm lov'in mine in my Wildcat...

AC2

My Feedback: (34)

Yes sir! Love that cat!! I got a lot of reading on this engine to catch up on.

Sorry for the sidetrack guys.... thank you for your patience

So being a radial multicylinder engine, is vibration less than a single cylinder and being 4cycle is power less than 180cc 2 stroke counterpart?

GeorgiaFlyer

Definitely less vibration than a single cylinder. I would say less HP than a two cylinder 2 stroke of the same CC size. However there is a ton more torque than equivalent sized two cylinder 2 stroke engine.

Pelle Gris

I don´t know about the 180, but my homemade geared 124 cc inline pulls the same prop at about the same rpm as my Moki 250. So my guess is, that the Moki 180 can be compared to a 80-100 cc two-stroke, but with the ability to spin a much more efficient prop.

In my experience the high pitch props used on the radials are much more efficient than the low pitch counterparts normally used on two-strokes. In fact I tried a Fiala 30x16x2 prop on a 140 cc two-stroke powered tug, and the performance was WAY better than with the 32x12x2 prop I used initially.
According to the prop calculator I use, made by the late Pé Reivers, the thrust at 70 km/h is 4-6 kg higher with the former prop, which can really be felt.
In an attempt to lower the noise level I´m going with a Fiala 28x16x3 on the tug this season, as this should, theoretically, provide almost the same thrust and speed as the two-blade, while lowering the tip speed significantly.

Maxam

My Feedback: (62)

Pelle, you are correct and your experience matches propellor theory. Unless for hovering a prop with a pitch to diameter ratio of less than .5 is best for stirring paint. A 32x16 =.5 32x18 =.56. As the ratio increases the efficiency increases to a point. People argue a very low pitch is good for slow planes yet a Pietenpol (slow flying homebuilt) uses a 74x51 which is a ratio of .7! -Tom

Straightleg

I use a Biela 32x22 on my Evo 250. 20% more push than on a Menz 32x18. +/- 4000 rpm on ground. CARF Pitts Python

/terje

LRFitch

I have a 215cc MOKI, and would like to remove the motor mount from the back of the engine. I have removed the two bolts that mount the carb, and the four smaller bolts that I think hold the mount in place. With all six bolts/screws removed, the mount still doesn't want to come off. Is there more to it, and is there any chance I'll screw something up by removing the mount. The reason for taking this all apart is to allow me to accurately drill the three motor mount holes in the firewall of a new airplane I'm building. Any help will be appreciated.

Larry Fitch

Greg Wright

My Feedback: (6)

LR Fitch,

Draw yourself a template instead of pulling the motor apart. Take a piece of card stock and trace the mount on to it. Then just use an old bolt that you grind a point on to and use that as a punch to locate the holes in the mount.
Draw the firewall shape on to it also and then you can just tape that on to the plane and use that to drill your pilot holes to mark the firewall for the engine.

GeorgiaFlyer

This is how I do it as well. It works great and much easier than pulling the motor apart.

LRFitch

Greg, and Georgia,
Thanks for the good advice, and I will likely follow it. I attempted to do exactly that about two times, and didn't get perfect hole placement. I have a set of hole center punches, but can only access two of the three holes in the mount due to the engine being in the way. I'll fiddle with it again today and see if I can make a suitable template.

Thanks again,
Larry Fitch

Maxam

My Feedback: (62)

Larry, Unless there is a bad coil, do not remove the mount. There are many wires and ignition cables that are carefully sandwiched between the mount and the engine. -Tom

Jaketab

My Feedback: (2)

Pictured what you will be looking at if you remove the mount and carb intake tube and go into the ignition coils.
The mount should separate with little resistance.
When my motor was fairly new I had an ignition coil go bad.
The repair involved de-soldering and soldering in a new one.

J Tab

LRFitch

Jaketab,
Thanks for the photos! When I finally realized there are five bolts holding the mount to the engine (not four), the mount came right off. Your middle photo (DSCF3237) is exactly what I see, except the machined plate on mine is black--likely anodized aluminum. So I lifted the mount off, made a couple templates, and carefully reasembled the mount and carb. Guys, thanks for all the warnings and information. It really helped keep me out of things I didn't want to mess with. Now my mounting ring is drilled and epoxied to the firewall that will be the front of my new tug.
Thanks Again,
Larry Fitch

Maxam

My Feedback: (62)

I stand corrected. J. Tabs pic shows it is relatively safe to remove the mount and not disturb the wiring. -Tom
Make sure you use a star torquing pattern and small screw loctite on reassembly.

jimphelps

My Feedback: (6)

Fellow Moki owners- couple weekends ago at the Sodbuster fly-in at Camden SC I noticed (with my Russian LA-7) as I was about to take to my second flight of the day that my muffler ring was completely loose on my Moki 250. After pulling the cowl off I noticed that the 12mm bends coming out of each head had come apart at each fairing. It was consistent on each one at the same place. I spoke with Scott Prossen and he has never heard of this......just curious if anyone else has experienced this problem? I am currently searching for 5 new 12mm bends and can’t wait to re-align all 5 ha ha!

Growler84

My Feedback: (8)

I've only seen this type of failure once on a setup using unsupported extended flex tubes to route the exhaust away from the cowl on an AMR Waco with a 250 in it. I remember 2 maybe 3 of the pipes broke. Did yours look like the example in the pictures below?

jimphelps

My Feedback: (6)

Thanks for the reply Growler84! No all 5 of my bends came apart right at the copper crush ring going inside the head. as I have learned over the last couple days I think this is a flaw with the 12mm bends mostly.....but a friend of mine explained that they all do this over time. Vogelsang has 5 new bends on order for me directly from Moki. He only carries 14mm bends so special order which means 4 weeks.......No flying at Joe Nall! bummer!

To your point I have not had the problem in your picture. I have 3 moki's.

Growler84

My Feedback: (8)

Uhmm...they do it over time? In my little group of Moki operators we have one engine with well over 200 flights on it and no such issues. Maybe just lucky. One more thing to watch out for.