Ziroli Corsair?  
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All Forums >> RC Airplanes >> RC Warbirds and Warplanes >> Ziroli Corsair?
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Ziroli Corsair? - 2/12/2002 4:53:42 AM   
todd3603


 

Posts: 37
Joined: 1/27/2002
From: Farmington, MO,
Status: offline 		I am preparing to start construction of my Ziroli Corsair, I have in hand my fiberglass fuse, plans, ect. I have a couple of questions and are looking for any additional hints, tips,ect that anyone may have (I have the plans for the three piece wing). First question, I am planning to install Robart retracts, which style should I go with for the mains and tail, Nick's site has two options. Second question, and I really hate to stir this pot again, but I would like to swing a three blade prop as close to scale size as possible, looking for motor recommendations. Every twin I have looked at so far that is of adequate power (in my mind) is too large for the cowl, would settle for a big single if it has adequate power. And finally, just looking for anyone who has built this bird with fiberglass fuse, I thought this was the way to go (it is a nice piece), but everything I have built is built up construction and I'm kind of lost on where to start. Thanks in advance for any help.

_____________________________

Todd
       Post #: 1

Ziroli Corsair - 2/12/2002 7:10:40 AM   
Jack Devine


 

Posts: 314
Joined: 1/7/2002
From: Kirkland, WA, USA
Status: offline 		For the mains on your Corsair use the 150Z Robarts and the 160 tail wheel is the most scale. If your serious about the big prop you might consider using a Zenoah GT80 twin with a Gerard scale prop hub with adjustable pitch control. This unit is very scale in appearence and the blades are changeable individually. Three different types of blade shapes are available. The GT80 will spin the 26" three blade over 6500 RPM. Another option would be the G-62 reduction unit marketed by Mick Reeves from the UK. It uses a stock G-62 and the reduction unit bolts on to the motor. The prop output shaft is in the middle of the motor so engine placement in the cowl would be very easy. Reeves says it has the power to spin a big prop in the 26" Diameter range as well. It's called the Torquemaster and it's on his website. It's a better reduction drive than the Byron (Iron Bay) system that was used on the Mustang and the G-62 is much more powerful than the Quadra 42s or Mustang 50s used by Byron. The Byron scale three and four blade props that are direct drive flatten out pretty bad at high RPM and are not very efficient. The maple blades used with the Gerard Hub are much stronger and far less prone to flattening out at high RPM. Frank Tiano markets the Gerard Hub and the prop blades for it. Bob Holman plans is the US contact for the Reeves reduction unit. I hope this helps!
Jack Devine

(in reply to todd3603)
       Post #: 2

Ziroli Corsair? - 2/12/2002 7:25:12 AM   
Big_Bird



Posts: 3237
Joined: 12/18/2001
From: Arlington, TX, USA
Status: offline 		Todd, I built mine with the Robart 150Z mains and the mechanical 160 tail wheel retract. I use a Robart cylinder mounted in the center of the fuselage and a 5/16" dowel to operate the tail retract. I did it to keep a little extra weight out of the tail end. I did find that the frame of the 160 is pretty flimsy because it split out where the frame is bent at a right angle. I built a new frame out of 1/2" x 1/16" aluminum angle.
Feel free to stir the pot about a 3 blade prop but you will not find anyone who will tell you that you can get an engine big enough to swing a scale prop and still get it inside the cowl and still have the performance that you need. I don't think you would enjoy a 32 x 4 prop very much even if you could find one. The F4U-1D had a 13' 1" prop which makes a 1/5 scale prop equal to 31.4". Also, you wouldn't have enough ground clearance. One tiny bounce down and splinters all over the runway.
I'm running a Brison 5.8 with a 24 x 12 prop. Seems to be a good combination.

Ken

< Message edited by Big_Bird -- Feb 12 2002 2:33AM >

(in reply to todd3603)
       Post #: 3

Ziroli Corsair? - 2/12/2002 7:43:21 AM   
mselby



Posts: 372
Joined: 12/29/2001
From: Bangkok, THAILAND
Status: offline 		Jacks suggestion is a good one. I don't know if Jack would agree but you might consider a Brison single 5.8 or the twin 4.8, it will give a bit more authority than a G62. I am not quite sure what your questions are on the fiberglass fuse.
Mike

(in reply to todd3603)
       Post #: 4

Ziroli Corsair engines - 2/12/2002 9:11:58 AM   
Jack Devine


 

Posts: 314
Joined: 1/7/2002
From: Kirkland, WA, USA
Status: offline 		Mike: I would agree with you on both of those choices. The 5.8 is a brute for power but it is a shaker big time. That level of vibration is tough on an airframe. Any of the new twin designes would work well too. The boxer engines are very low vibration. I have a Sachs 5.0 twin in my Ziroli Corsair and it fits inside the cowl with NO modifications to the cowl. I used the little NGK sparkplugs with a C&H ignition and it clears the cowl by about 1/4" on both sides. It has very good power and a really good exhaust sound. A wide open low pass really puts this engine on song. I love it. I spin a 22 X 10 prop and it flies very well with this combination. There is a guy in a club close to here that has the GT80 and the gerard setup for his Corsair. He is spinning a 26" 3 blade and says it's taking at 6500 rpm and the motor is still brand new. He sent me a few pictures of it running on a test stand and he had painted the prop blades black and had red and white tip stripes on them and reved up had the pretiest prop circles you ever saw. I don't know if he has his corsair flying yet.

(in reply to todd3603)
       Post #: 5

corsair scale prop - 2/12/2002 11:41:37 AM   
bentwings


 

Posts: 274
Joined: 12/22/2001
From: St.Paul, MN, USA
Status: offline 		Ken is right on about the size of the scale prop. I'm about 3/4 done with a scale 3 blade and it is huge not only in diameter but width of the blades. You have to remember that our planes use a 5 1/2" wheel instead of 6" that is closer to scale and the struts are about 1/2" shorter too all in the game to get the gear up in the wing. The 150 cc engines turn a 30' prop I guess but their width is way too big for a 1/5 Corsair. I can't imagine what it would be like to take off with 150 cc motor and a 28 or 30 inch prop. Probably just like a full scale!!! You would have to really easy into the throttle. What a hoot in the air however!!!
Actually I think the scale 4 blade prop is smaller in diameter but has even fatter blades.
bentwings

_____________________________

bentwings

(in reply to todd3603)
       Post #: 6

Ziroli Corsair? - 2/13/2002 7:50:13 AM   
todd3603


 

Posts: 37
Joined: 1/27/2002
From: Farmington, MO,
Status: offline 		Thanks for all the replies and good information. I guess when I stated I wanted to swing a scale three blade that I actually meant like a 24 or 26, because I had done the research and figured out an actual scale prop would be too large. Still thinking about the info you have provided me, like the idea of the adjustable pitch three blade hub from Frank Tiano. Thanks again.

_____________________________

Todd

(in reply to todd3603)
       Post #: 7

Ziroli Corsair? - 2/14/2002 6:23:41 AM   
alsez


 

Posts: 54
Joined: 1/28/2002
From: Eustis, FL, USA
Status: offline 		The BME 102 will fit also and turn a 26/8 -3 blade at a good clip.

(in reply to todd3603)
       Post #: 8

Engine for Ziroli Corsair - 3/5/2002 9:09:07 AM   
Fighterpilot



Posts: 445
Joined: 12/20/2001
From: Kenner, LA, USA
Status: offline 		We are flying an American Eagle Corsair, 93" span, epoxy fiberglass fuselage, with a Quadra 75 on magneto. We are currently spinning a Bolly 3 blade prop, I believe it is a 22X11. You really would not want your Corsair to go any faster than this bird flies. At 31 lbs, the aircraft takes off inside of about a 25 ft. roll out and climbs with authority. It will loop from straight and level flight without any noticable loss of speed over the top. Vertical performance is very good. The engine has a rear exhaust, which exits at the bottom rear of the cowl using a B&B muffler and the carb remains inside of the cowl. We have been flying this aircraft for over a year now and would not change a thing except maybe the CJM retracts which have come apart on a couple of occasions.
The Quadra 75 on magneto is trouble free and very dependable, which you definitely desire in your warbirds. It has a decompression button on the top of the jug, that when depressed relieves the compression for ease in starting. We use a Miller belt driven reduction set up on a Sullivan Hi Tork starter on 24 volts to start all of our engines in our warbirds. I've used it on engines up to a 6.0 Husky with no problems.

(in reply to todd3603)
       Post #: 9

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