Hi guys

Ive been trying to get some advice and someone told me to post in here. Im changing to gas finally and I want to put a new zenoah in a 60 P-51. Is there anything right off the bat I should know going from four stroke to gas? Do i need a different tank? Any help would be appreciated.

http://www.rcuniverse.com/forum/m_8673009/tm.htm

The G-20 Would WELL overpower the 60 size P-51! Any Maker! I had one in a Hangar 9 Corsair swinging a 15x7 3 blade and it was to fast for scale flight! The other problem you might run into is the side carb of the G-20. It would butcher any cowl. I had to cout the cowl of the Corsair and it is big and round! Your best bet would be one of the new rear carb 20cc gas engines that are out there. The only problem that I had with that was that I could not find one that would balance in a 60sized mustang with out a lot of extra tail weight. I have a Top Flite 60 ARF with a OS 110a in it. That engine weights 21ozs and it required no tail weight to balance. When you start adding 12 or more ozs to the nose with a gas then the weight needed to the tail become important!

Similar combo in action:

http://www.youtube.com/watch?v=M8w0-39kTAM

capo915, did you ever mount the G20 in the p-51 yet? I'm thinking of doing the same thing with mine.

Yes sir I did and it is not overpowered like some of the above posters said it might be. In my opinion it is a perfect match. There is a problem cutting the cowl on both sides because the inverted wrap around muffler does not fit for the distance needed form the firewall. I put it in a model whose fuselage is fiberglass. It weights about 11 pounds dry so its not a light bird but the zenoah handles it beautiful. I am however starting to notice a problem with this engine as it starts to surge after about 5 minutes. It does not quit but any engine that surges is just asking for trouble. I dont know if its the battery thats causing it or what but I know its not running lean so.........

Thanks capo, What brand p-51 do you have? I have the H9 60 Marie.As far as the surginggoeshaveyou checkedfor any air leaks in the fuel lines or anywhere? I just had the same problem with my G51.

Im about to take out the tank and check all fuel lines but I did not see any bubbles and thats usually the first sign of leaks in the line. Maybe there are some leaks....Ill check. Its actually the nitro models version which is a direct cut from the H9 version. I was gonna get the H9 but I liked the idea of fiberglass so I went with this one. They really have improved this version from nitro. Yours will probably handle even better since it will be a little lighter than 11 pounds! FYI- I needed to add weight to the back of the fuselage so I just used some servo extensions and put the receiver battery toward the tail. Balanced beautifully. Ill post some pics tonight

Thanks for the info, I'm currently running an OS 91 surpass but am wanting a little more umph..lolThe 91 will be going in my GP Extra 300s when it's finished.

Funny thing. I had the same setup but Im in el paso with the altitude at 5000ft. The os 91 struggled. A fellow member put a saito 20 gasser and in my opinion it was not as fast as the zenoah. I put the rpm at around 8800

Yup, I was expecting more from the 91 but if that's scale flying,I want a little more..lol

I just put one in a Dragon Lady .60.....66" span, 872 sq. in wing and it is an absolute joy!!! Plane flies superb and lands like a trainer. On the maiden flight I took it up and tested for any snapping tendencies etc. and there was none. Come out of a loop @ very low speed and give full up and it will simply mush around the sky like my old PT40 would without dropping a wing or "stair stepping"-amazing! The Zenoah is a powerhouse BTW! It has performed like all my other Zenoahs-without a single hiccup!! Good luck with your decision!