Posts: 592
Joined: 4/26/2002 From: Duncan,
SC, USA Status: offline
no I don't believe it will fit, it might though I'm not sure.This aircraft builds pretty light and this engine would fly it but I believe it is too big and heavy if you want to fly 80 cc's go with a single cylinder then. They are very quick birds with a 60 to 70 cc motor.
Posts: 1101
Joined: 12/24/2001 From: Swartz Creek,
MI, USA Status: offline
I believe your plug wires will hang out with the GT-80. Finishing one right know and am putting a 3.7 ported Sachs in it. I think it will be tail heavy with it. Hoping not to add to much weight.
Posts: 3186
Joined: 12/18/2001 From: Arlington, TX, USA Status: offline
John, I may be wrong but I think it will based on this. A lot of guys use a G-62 to power their Ziroli Corsair while mounting them in the center. On my first Ziroli Corsair I used a Sachs 3.7 (62cc) centered. It would seem to me that a twin using 40cc jugs should fit. Looking at the photo on the Horizon web site you can plainly see that the plug caps are on at a good slant. As I recall, the cowl is about 10" in diameter. If I get a chance I'll measure mine tomorrow. Maybe someone will give us dimensions on a GT-80. I think this would be a fine choice if it will fit and you keep the weight down to 30 pounds.
By the way fryfly, the typical Ziroli Corsair does not build up pretty light. I've seen weights ranging from 27 pounds to over 40 pounds depending on the equipment and amount of scale detail. Mine weighs 36 pounds and is powered by a Brison 5.8. At this weight the plane flies great and the flaps are very effective.
Posts: 354
Joined: 12/18/2001 From: Gonzales,
LA, USA Status: offline
Call CH Ignitions and get the shorter plugs and it will fit. I am doing one now and have fit the engine. I opted to ditch the can mufflers and made 2 header pipes that exit down and outward. The engine almost fits with the stock plugs, but will not make it. The plugs are NGK BPMR6F. The engine I have is running a CH Ignition conversion, but it works with the mag too. This engine really comes to life without the restrictive mufflers and a 22x12 Mejzlik prop.
_____________________________
From the swamp, Lenny ....Bayou Boys R/C http://www.eatel.net/~l454s
Posts: 592
Joined: 4/26/2002 From: Duncan,
SC, USA Status: offline
the reason I say the F4u builds light is that the 3 that flew at out field this year (ziroli) all weighed uder 32 pounds and they all had retracts and looked pretty darn nice. By the way the above pic looks it looks as if the engine would fit but don't you think for the size of this airframe the 80 twin ( zenoah) is adding just a little weight to the nose end of this bird. I'm running a 3w 75 Twin spark rated at 8 horse on the front of my ziroli p-47 at 35 pounds and is just perfect,motor weighs in at 5.12 ounces and it balanced perfect without adding weight. The zenoah gt 80 weighs in at almost 8 pounds,seems to me and I could be wrong that the wing loading is going up a little too much to be agile at slower speeds.I think the engine will work fine but I don't think it will be a very scale flyer with the big motor up front. Just my opinion though,don't want to start a war! Terry F
Posts: 354
Joined: 12/18/2001 From: Gonzales,
LA, USA Status: offline
This engine weighs 5.2lbs as is. I dont see this as being too much weight. The stock mufflers weigh a pound and kill horsepower. This engine is a great combo to this airframe and even at 32 lbs and above will have all the performance you could want, fly at half throttle. Have a buddy building one with a 4.2 Sachs and it sticks way out the bottom of the cowl. I am doing another one with a 3W78 twin, the plugs are small but stick straight out. I put a couple tiny blisters on the sides of the cowl, and split the cowl at the bottom and opened it up .80 inch and reglassed it, you cant tell. Try putting your cowl in place and look at it from a profile angle. The bottom of the cowl was above the bottom of the fuse and did not look right, by splitting it and opening it up at the bottom, it looks good and I got the clearance needed to only have tiny blisters on the cowl...Lenny
_____________________________
From the swamp, Lenny ....Bayou Boys R/C http://www.eatel.net/~l454s
Posts: 3186
Joined: 12/18/2001 From: Arlington, TX, USA Status: offline
Lenny, I really like the sound of open pipes on a warbird but I don't think most of the warbird and giant scale flyins that I go to would approve. What experience have you had along this line?
Terry, my Corsair only has a two position switch on the throttle, "landing" and "go kill". LOL Just kidding.
I think the idea of a GT-80 is super since it will fit.
CUB1....My F4U weighs in @ 34 lbs with a Q-75 for power....it is as docile as it gets...lands and takes off with ease.....5 yrs old this month with 172 flts on it...........I've seen the Zirloli Bearcat with the Gt-80 eng in the cowl with a scale straight pipe arrangement and its not that loud...but does sound awesome.....How does the Bearcat Cowl size up to the F4U cowl?I think you'd be a bit overpowered but I always overpower my warbirds...its much easier to retard the throttle than go looking for power that isnt there.....not to mention almost every warbird needs nose weight during the W/B process......GoodLuck.....Bill....
Posts: 354
Joined: 12/18/2001 From: Gonzales,
LA, USA Status: offline
Big Bird, I have been to many a flyin and aint nobody said anything yet. Have you ever heard a B&B muffler? It does not do a lot of muffling. I guess down here most folks figure run what ya brung.
_____________________________
From the swamp, Lenny ....Bayou Boys R/C http://www.eatel.net/~l454s
Posts: 984
Joined: 7/16/2002 From: cary,
IL, USA Status: offline
Here's mine with a GT80 installed. I recessed the engine a bit as I didn't like the way it looked with the dummy radial up front, although the scale aircraft hub did protrude well beyond the cowling face.....
The blocks shown are used to attach the cowl from inside the cowl using 1/4-20 nylon bolts.
The CH plugs and short boots allow the engine to be mounted without holes or blisters on the cowl.
Printable Version
All Forums >> RC Airplanes >> RC Warbirds and Warplanes >> Ziroli Cosair / Zenoah GT 80 
Ziroli Cosair / Zenoah GT 80 - 
