I have to agree with Silversurfer, getting an engine that is to small and then having to put a pipe on it etc. to get every last bit of performance out of it is just plain stupid. You end up putting a lot of time in to get the setup to run right, questionable reliability, much higher cost, and alsmot as much weight in the end as with a bigger engine.

If you want a plane that flys very well with plenty of power and zero engine problems, put a Zenoah G-62 on it

If you like fiddling with engines all day, and going through a bunch of schit to get a small engine to scream fast enough to pull your plane, then go with one of the light engines and pipe [:'(]

JettPilot

The can on the 40 is a muffler - these devices are for controlling noise without reducing power.
Not a pipe
Use what you like but sometimes it does not hurt to learn that there are other approaches which work extremely well.

I will be able to weigh my 47 shortly and then will decide if my ZDZ-50NG equipt with the Supersonic Pitts style muffler and swinging a 22X8 will produce enough thrust.

---------->I have heard the GP 78" Extra is on the heavy side for a 25% that I guess it is , well I can say from boring holes in the sky with it,that the ZDZ-50NG always pulled the Waggs--Extra vertical and after hesitating did the vertical roll thing while running a mixture of 32-1 (4 Fl Oz)PennZ o---2 cycle to 1 gallon 92 octane and the high end needle on the Warbro carburetor , set a bit rich.

I might just add ZDZ RCS does not recommend Lawn Boy ash less for their engines

Interesting I receive this e-mail stating "problem starting ZDZ-50NG "and some one at RCS had the post deleted. This is twice-------so I can take a hint and so it is another method for getting a ZDZ to run goes up in smoke ash less I would of thought[sm=lol.gif][sm=lol.gif][sm=lol.gif]

ferget it --
some guys can wreck an anvil with a rubber mallet.

Richard,
post 29,
Huh?

this gets stranger and stranger

Jet Pilot you may be right the Top Flite G/S P-47 does tend to build tail heavy well at least mine did, so with all advisement I'm thinking a G-62 for MY warbird .

"I can strip everything off from the firewall forward and start over which is indeed tempting and logical considering the time I have spent building this one I want power and RELIABILITY and who does not depends.[sm=lol.gif][sm=lol.gif]

dICK regarding your statement you have a PM [sm=49_49.gif]

Do you think the DA-50 would make a power and or reliability difference[sm=confused.gif]

The burning hoe in the ground," must occur ahead of the flight line and run way

Comparing a DA 50 to a G-62 is like comparing a Ferrari to a Mack Diesel. I am sure that some combo of prop will allow a DA 50 to put our more power than a standard g-62 but I think the g-62 will still be running great when the DA has bitten the dust. Please don't compare a lightly loaded IMAC plane with a 50 to a warbird with a g-62. They are totally different beasts. The local 3d guys in our club just don't have a clue as to how much different the two types of planes fly. I quess that's why you will see posts on RCU from the 3d guys knocking those warbird guys who "just do nothing but low passes". Totally different performance envelopes!

Larry

Good points -- my experience in gas is obviously limited and never one to be a know it all: I compromise based on feedback and subsequent statistics that emerge from them and it seems in the war bird circles its most certainly the G-62 for my A.C. type .

If it was my plane it would be a G 62 with electronic ignition, only because I had a G62 with the magneto and frankly I got tired of slapping the dam prop all the time to get it going. Or for the extra weight of a spring starter it makes life simpler Its a war bird, its not a 3D bird!

I would also take a hard look at the new 3W 55 http://www.aircraftinternational.com...qtr_rt_lrg.jpg

side mount carb so the needles would be easy to get at, not hard to mount, good power, and they run good!

Dick Hanson,

Haha we ran a Vertex for years in our chev dragsters too. Then on to the Schafer in the blowen 392 and even the top fuel FC 426 (482 in) before they went to dual Mallorys. Gotta love mags.

G-62 choke it till it pops, turn the choke off and flip it and fly. Never fails. like the rabit.

At one time all we flew around here was G62s. I liked mine, and I would flip it choked full throttle till the carb was wet, throttle back and then bang on the prop till it fired. Usually it would take a good hit or two. But at times[&:] people ( not just me ) would have to hammer away at the prop to get it to kick. It needs a good fast turn to get a good healthy spark!

I got tired of this ( my engine was set up right, and the gap between the CDI unit and the prop hub was right, needles set right ) and went with a spring starter. That made life much simpler. I have seen this with many of them. Sure they work well most of the time and are not hard to start with a manual flip but not always.

Some people went with the big power starter, but ya need two people to get it fired then.

Me, I liked the spring starter, pull back and let her rip.

"G-62 choke it till it pops, turn the choke off and flip it and fly. Never fails. like the rabit."

This is the truth, we have 5 or 6 G62's flying at the field.... I have been there for 10 years, and have never seen one quit in the air.

My next warbird will be getting a RCIGN G62... If I'm not mistaken Ralph is selling them for less the $500 now.... Great deal, and they will last forever... Plus, if I get bored with the Spitfire, I can put the G62 in several aerobats available now....

RCIGN G62,

Excuse me for interupting, please.
I see your online and I thought you cold answer my inquiry.

I see people starting their large gas engines by spinning them clockwise by hand and grasping the spinner.
is this safe and what would be the correct way of doing this?

Nobody starts a gasser that way, it won't....Large glow engines can be started that way...
Or gassers converted to glow with a glow plug....Works fine, the guys we race with use Moki 2.1s for powering their Lanier Dominators..Most use that method...It bounces back off compression hard enough to start....

Thank you very much. you probably saved my fingers. in will wind the spring on my zenoah 38 and electric start my Zenoah 23.

Robert

Thanks for ALL your support Mike but even the best engines need good PR and like Wow sure never got any from you just a lot of c--p BTW love that story about D. @ Dougs and the nicad great folks you are..[8D]