rcgoodtimes

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Hello I have a question as stated, CMP Extra 300s 72" wingspan will it 3d or not . I only have four flights on this new airplane so it is still running fat at this point. I have an 16x8 prop on it and it flys fine fast but vertical is weak at this point I have heard the come around as the break in but I was wondering if it will do the things I want it to do or what...Will it hover? What prop do you reccomend for this set up . What oil what fuel octane ? This is my first gasoline , That is finished I have another in build but Just wanting advice so throw it at me ...

Jezmo

I can't help you with the CMP question but the Zenoah I can talk about. The stock engine out of the box should turn a 16X8 about 9000 rpm's after a good breakin. Don't tune it rich like you do a glow, it only makes more carbon and that's bad for the engine. Tuned properly and after a gallon or two of fuel it should hover a 10lb plane OK. With a better exhaust it'll turn an 18X6 about the same rpm's and give significantly more thrust with no weight penalty. With a tuned pipe it will turn an 18X6 carbon fiber Mejzlik prop around 9800 to 9900 and pull an 11lb plane out of a hover like a balistic missle. Mine was converted to CDI ignition and lightened significantly but the factory EI version will run just as good. Good luck with yours.

rcgoodtimes

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O.K. thanks I do have a Bison smoke pipe on it don't know if that makes better power than stock but I can hope so .Did the electronic ignition help with power or can it be noticed . The airplane is fairly light to start with,so I hope it does well..

stangman67

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Is your 26 the magneto version or the ei version? If it is the magneto version I would say forget about 3d due to the relative high weight and low power. My g38 is kind of a paper weight when it comes to 3d , it runs great and pulls my 75 inch extra around pretty good but will not 3d it at all.

Jezmo

It did not help with power although it idles smother. The main difference with the EI was weight savings as it allowed me to get rid of the heavy flywheel and cut the rear shaft stub off. (That little 1 1/2" piece of steel shaft weigh’s more than one might think) I also did some other work that lightened it even more.

rcgoodtimes

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Yes it has the magneto but it is a small one with the coil out to the side of the motor not on the magneto like the 38 cc I have has it set up like a weedeater . This one seems like it may be quite a bit lighter but not as light as without the flywheel for sure.. Thanks for the replies If it won't do what I need it to do then I will have to either put in a bigger piston and cylinder or replace the whole motor , I'm thinking a 40 or 50cc without the magneto and flywheel will surely rock this thing .. Does this seem extreme for this size airplane??

stangman67

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40cc or 50cc will be way too much power for a quarter scale plane. The Dle30 makes tremendous power and should 3d that plane with ease. Although if you can get performance as Jezmo said, it should be fine, although turning 9800 on a 18 by 6 seems pretty unrealistic to me.

Jezmo

Yep, for those unfamiliar with setting up a tuned pipe system it probably does sound "pretty unrealistic" and I wouldn't recommend it for those folks that are not extremely into tuning for peak performance. Also, as I stated in my earlier post, don't run it rich like a glow engine. It will only cause carbon to form in the combustion chamber and will not help anything. If you feel a need for more lube during break-in then add some extra oil to your mix.

If you decide to get a "bigger" motor then zachfeen's suggestion on the DLE is a good one. I also agree with him on the 40 to 50cc engines being too big, BUT, one thing to consider is the DL50 and it's bigger brother the 55 are within a couple of ozs of the magneto version of the G26. Mag G26 weight = 3.73lbs and DLE55 = 3.5lbs + 4 cell AA battery pack at approx .26lbs. Good luck whatever you decide.

rcgoodtimes

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What I meant with the too much power is will the airframe handle it or not so much . As long as it has a throttle too much is not a tearm I like to use I do understand there are always limits but I'm not sure here . Anyway thanks for the input I was hoping more folks would jump in and give advise .. I do believe the operating range is between 2,000 and 10,000 rpm so it is feesable . I have had some tuning experiance with other two stroke motors with tuned pipes but I am not gonna go there on this one .. Maybe a 17x5 prop will be the next step after break in or a 16x4 apc I will try it all before its over with I'm sure .. Thanks will get the tach out this weekend for sure ..

stangman67

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a 40cc may be ok with the airframe but a 50cc will but way too much on the airframe, a 30cc will do everything you want and more. Get the tach our and give us the results you are getting with your current prop and we can work from there.

rcgoodtimes

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O.K. well I had the tach out today and the best I could get so far with this prop is 7800 rpm.Keeping in mind it has not quiet had a half a gallon of fuel run through it yet , I am going to try a 16x6 tomorrow and maybe a 16x4 wide as well.. However with the 16x8 when this thing unloads in the air holy crap it flies pretty fast . I can hardly wait untill it is broken in and the power comes on a bit .

rcgoodtimes

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Well I'm back from the airport today and I have new news for anyone interested.. Today I put a 16x6 APC prop on and made some more adjustments - I was extremely suprised at the number I got today I was geeting a reading of 9800 rpm with the new prop . Now I don't think I was doing anything wrong yesterday but today it was nuts to have that much difference . The other prop the 16x8 was a zinger wood prop. I was wondering if the apc would make that much difference from the lighter wood prop. It is really starting to come around now though . I will post again when I fly some more and see how the motor settles in ..

rcrick10

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hey i have the cmp extra 300s you know the stars & stripes one. the first engine i had on it was a ops 30cc glow. it was gutless. at about 12 pounds it's not a lite plane. i installed a TGY52cc it's the same weight(3.5lbs) as the 30cc but twice the power. hovers at 1/2 throttle. the TGY52 is a 45cc overbore. it still lands a little hot because ot the weight but not bad. i'm running a 18x10 at 8900 rpm 20x10 7800 (22lbs static thrust with the 20x10)rpm. did i mention it's only $200 bucks shipped to the US.

rcrick10

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oh compresion has increased with use i have about 4 gallons through it.

rcgoodtimes

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Yes yhat is the same airplane I have . It flies well and fast with the 26cc zenoah but no 3d at all it is a bit of a dog in acrobatic mode but it flies pattern well ... I have a brand new DLE 55 but I am planning it for another airplane was thinking about this airplane but didn't know if the weight would be too much ..

rcrick10

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it handles the weight just fine. i even have a TME smoke system in it. it's a solid plane.