norbe

My Feedback: (51)

I was looking at this engine and it seems like a good one. There is another version of it with the remote needle valve.. What is the advantage of this last one? Another question is how do this engines perform, and if there is some pitts stile muffler that would work on this engines.
Thanks
Norbe

kingair41

My Feedback: (13)

Norbe, I plan on using 4 for my project and am doing the same research as well. Go to www.bissonmufflers.com they have a Pitts muffler for this engine. Slimline also has a muffler to choose from. The two engines are the same just the remote capability is the difference.

djlyon

The only advantage to the remote needle is to help keep your fingers out of the prop and protect the manufactures and distributors from law suits.

The engine is pretty much a chinese rendition of a Webra 120 and muffler systems that fit the Webra 120 should work on the GMS 120.

Denis

norbe

My Feedback: (51)

thanks for the info, I am willing to put this engine in a Super Kraft Cap 60 since I saw many people use this huge eingine on this caps.

twostroker

My Feedback: (37)

I've got one on my Kangke 232/60, it's a good combo. It will fit in the cowl without cutting a big hole for the head, but I advise that you do for cooling. I learned the hard way by overheating mine a time or two resulting in a flame out. All was good once the entire head was exposed to the open air.
Tim

norbe

My Feedback: (51)

How is your vertical?

twostroker

My Feedback: (37)

Endless with a 16x6 APC.
Tim

norbe

My Feedback: (51)

Sounds cool hope to get my plane soon so next month I can get the engine and make it fly.

Boss248

Ha what does your Cap weigh?? I am finishing up a Goldberg Ultimate bipe that I was going to put a Saito 180 on the nose but those GMS 120's looked good for the money. The plane will fly with a .91 in it but I need unlimited vertcal, I have been eye balling the GMS and the Thunder Tiger 120's.

twostroker

My Feedback: (37)

The Kangke will have an "all up weight" around 8lbs. I have built 7 of them with different engines and they all were about the same due to required balance weight. Luckily, I was given the chance to fly all of them that were built before doing my own so my engine choice wasn't a guess. My favorite plane/engine combo was the planes with 120s in them. It was a toss up between the 120 4-strokers and the 120 2-strokers as both planes had plenty of power. The last Kangke 232/60 built for a buddy (hasn't flown yet...snow) will be an animal with it's Moki 135 on the nose. If you do decide to go with the GMS 120 or any other big engine let me know and I can help with servo placement for optimal balance to keep the added ballast to a minimum.

Boss248

Sounds good Twostroker...thanks for the info. You refered to something called snow...well here is a rare picture of this white stuff that we almost never see this far south. It s a real treat for us but I know it is a nightmare for you folks up north but I just had to take some pics. because come June this will be nothing more than a wishfull dream when it is 100* outside. I know this is off topic but I could no resist. That is my house in the pic...

norbe

My Feedback: (51)

Fortunately I live in the tropics, but if it is not snow that stops you from flying, it is wind. Here we have some very strong winds in this season so flying is almost impossible. I haven't recieved my Cap yet and Hope to get it within the next week or so. I was thinking of that engine since it is cheaper than the 91FX and has more power on it, and as you say, I read that this planes come out tail heavy most of the times. For what concerns the servos I would need some advice. I was thinking this configuration, please tell me if it would work. I use futaba so 1 S3004 for the engine 1 S9001 on the rudder and all the rest S3001... What do you think? I thought of that config since I have those servos and don't need to go out and buy new ones.

elugo

I am considering buying a GMS 1.20 or a Webra 1.20 to be installed inverted on a F6F. Can the GMS run inverted without problems? GMS $159.00 Webra 199.00 which one will you choose?

twostroker

My Feedback: (37)

Norbe,

We really crank on our planes control surfaces to get good 3D flight so we use meduim torque servos with around 60-70oz. pull. The last plane that was done with double beveled control surfaces and robart pin hinges so it can swing any surface 90 degrees. There was one plane I did with standards all the way around but I didn't like it. The magic number for the rudder seemed to be the 60-70oz. servo to hold good knife edge.

The servo placement was changed around to balance the plane without adding weight. For instants, the servo tray was moved back on the planes with 120's in them. The plane with the 135 needed the tray moved back and the rudder servo mounted in the tail to achieve a balance point of 38% of MAC. All the rest of the planes were balanced at 35% of MAC. The planes that are at 35% are very nice and stable flyers, we are yet to see the 38% plane, it may be interesting!

Boss248,

Snow, snow, and more snow. We have had our share. The local wildlife needed a bit of aid this year so I helped out with some rations.

elugo,

It will run fine any way you put it.

Tim

RJConnet

I have both and find the Webra about 200 RPM stronger and about 3 ounces lighter than the GMS. That being said my GMS is much more user friendly, easier to set up and it just never quits. The Webra had a rich mid-range that I was never able to completely tune out which led to the re-kitting of two airplanes. It all boils down to "You pays your money and takes your choice". Both of mine were mounted horizontally so I can't speak to the inverted position.

RJ

Ed_Moorman

My Feedback: (1)

You might also want to consider the price of mufflers and a couple of other engines, both of which come with mufflers.

Bisson mufflers to fit all of the 1.20s are $48.

The Magnum 1.20 (ringed) is $199.99 and the Tiger Shark 1.20 (ABC) is $159.99. Both come with standard type mufflers. TS sells a Pitts style muffler for their 1.20 for $32.

The GMS site now lists the 1.20 at $169.99, but you can get $20 off by trading in a .10 or larger engine.

norbe

My Feedback: (51)

Well towerhobbies has the engine at $160 but is w/o muffler. So the prices are very similar. For what concerns the pitts muffler I think that since in any case I am going to install it I really don't care if the engine comes with the original muffler or not.
The more importat thing is wich is the best engine for it's price. The GMS seems like a good engine and most people say good things on them.
I know nothing on the tiger shark... how is it?

browney1970

[My engine heats up and shuts down constantly no matter how rich you set it.
Burns up glo plugs. Any suggestions? Has j-tek snuffler muffler

twostroker

My Feedback: (37)

Browney,
What plane is it in?
How about the cowling.
It sounds like it is simply over-heating.
Mine did the same, until I opened the cowling up for added cooling.
Remember he rule of thumb: "Twice the exit area as the intake area". Meaning you will need a hole 2x larger behind the engine as in front of it to create the venturi action past the cylinder.

Tim

browney1970

Thanks for answering
Plane is a ultra stick 120 has no cowl on this plane. a dozen experienced members of
our club and myself have tried everything.