RE: TF GS P47 Build - yeah another bloody one!!  
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RE: TF GS P47 Build - yeah another bloody one!! - 9/13/2005 11:52:17 PM   
Canuck1



Posts: 1079
Joined: 7/1/2002
From: Edmonton, AB,
Status: offline 		Well I cleaned up the vents. Applied putty sanded and through on a quick primer coat to see how they looked. Turned out not to bad. I still require more finish on the outer surface.

Craig.

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RE: TF GS P47 Build - yeah another bloody one!! - 9/14/2005 12:13:35 AM   
Peter_OZ



Posts: 4572
Joined: 6/5/2002
From: Brisbane, , AUSTRALIA
Status: offline 		ahhh I see said the blind man

you are setting the standard for sure

< Message edited by Peter_OZ -- 9/14/2005 12:15:21 AM >

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RE: TF GS P47 Build - yeah another bloody one!! - 9/14/2005 4:02:59 AM   
RWHorton


 

Posts: 74
Joined: 1/14/2005
From: Billings, MT, USA
Status: offline 		The exhaust is located just aft of the oil cooler doors and at the rear of the plane in front of the tail wheel. Whe the turbocharger wasn't in use the exhaust was dumped out up front and then as the altiude went up the pilot would close the butterflys on the exhaust and the exhaust would then be routed to the turbocharger in the rear.

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RE: TF GS P47 Build - yeah another bloody one!! - 9/14/2005 4:33:47 AM   
Peter_OZ



Posts: 4572
Joined: 6/5/2002
From: Brisbane, , AUSTRALIA
Status: offline 		makes sense

well I will be scale of a sorts after all

cheers

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RE: TF GS P47 Build - yeah another bloody one!! - 9/16/2005 5:02:19 AM   
dwr


 

Posts: 220
Joined: 10/29/2004
From: ft.myers, FL, USA
Status: offline 		Hey Peter, I got my G-62 out a couple days ago to get it mounted on the Jug. Needed a half inch of extra plywood to get the correct clearance for the cowl. I am using a slimline pitts style muffler and had to cut back the bottom of the engine box a little. I'll send a pic when I get it mounted again tomorrow. After fitting the engine I removed it and installed a carb kit since the engine has been sitting a couple years. Put it on a stand and she started right up as G-62's always seem to do. Got it adjusted and was seeing 6100 rpm with a 22/10 master airscrew scimitar prop. Is that about right? I forget-- its been so long. I know you are a rep for the Zenoahs so maybe you have some numbers??? Catch you later. DWR.

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RE: TF GS P47 Build - yeah another bloody one!! - 9/16/2005 5:37:07 AM   
dwr


 

Posts: 220
Joined: 10/29/2004
From: ft.myers, FL, USA
Status: offline 		hello all, here is an interesting site with good stuff on the Jug http://rwebs.net/avhistory/history/supercha.htm DWR.

I lifted this off the site:
Supercharging is controlled to maintain the manifold pressure value selected by the pilot, by means of an oil operated supercharger regulator. The regulator, through linkage, varies the position of waste gates in the exhaust pipes just aft of the collector rings and thus controls the volume of exhaust gases directed to the nozzle box of the turbine. The position of a piston in the regulator, is balanced by exhaust pressure and a compression spring; the spring is mechanically loaded to correspond to the desired exhaust pressure valve by a supercharger lever in the cockpit. When the exhaust pressure varies from the selected value, the piston moves in the direction of the greater pressure and opens a port admitting pressurized lubricating oil to that chamber of the regulator which will affect the movement of the waste gates in the proper direction to balance the piston at the neutral position.




< Message edited by dwr -- 9/16/2005 5:43:19 AM >

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RE: TF GS P47 Build - yeah another bloody one!! - 9/16/2005 6:03:44 AM   
Peter_OZ



Posts: 4572
Joined: 6/5/2002
From: Brisbane, , AUSTRALIA
Status: offline 		DWR,

good ol G62s they just keep on getting better. Sounds like not bad figues, maybe a bit loaded, you could go down in pitch a tad though. What this does is twofold. oh and throw the MA in the bin or keep it for stirring paint go get a Bolly!

1. Does not give you as much grunt for takeoff which is fine as it makes it more scale - but . . .

2. Allows the engine to unload on downhill legs so that it builds up a very convincing roar and prop while, sounds most impressive


Other thing to do is get the angles carby throat or put on the trumpet pot throat, this stops a lot of the fuel escaping out, improves fuel ecoonomy and basically makes it run sweeter.

Look forward to those pics.

cheers
Peter

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RE: TF GS P47 Build - yeah another bloody one!! - 9/16/2005 3:36:48 PM   
dwr


 

Posts: 220
Joined: 10/29/2004
From: ft.myers, FL, USA
Status: offline 		Peter, here are the pics. I plan to increase the muffler/engine box clearance and the exhaust tip/fuse clearance by another quarter inch or so. I like the Bolly prop idea but our club has a big noise problem with housing developments closing in on us. We have been going up in prop lenght/pitch to try ease the the db levels. I am interested in the angle carb throat, have never seen one, please tell me more.
The G-62 walbro just about touches the cowl, in fact the forward mounting bolt does touch the cowl. Looks like I have to make an oval opening in the cowl for intake air and to clear the forward bolt. A carb throat will protrude from the cowl. Any thoughts on that? DWR.

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RE: TF GS P47 Build - yeah another bloody one!! - 9/17/2005 12:53:24 AM   
Peter_OZ



Posts: 4572
Joined: 6/5/2002
From: Brisbane, , AUSTRALIA
Status: offline 		DWR, you do need a bit more clearance on that exaust for sure. Understand perfectly about the noise problem, we have similar issues in this country. Though our club is in an industrial estate with a bloody great 6 lane motorway to one side so noise isn't a concern.

Ok you need to get a zenoah 90 degree carby adaptor, it puts the carby @ 90 deg to the engine itself. They are I think an aftermarket item.
The other throat is what they call a "power throat" It has the throat itself cut at 45 degress. Think they are aftermarket items


ok about your engine revs, 6100 is a bit low for a 22x10, you may want to give it a tweak, new plug and check your high speed mix. It might want a tank or 2 through to get the spiders out of it!

ENGINE PROPELLER
G26A 16x8 @ 8,700
G231 Heli Adjust pitch of rotor to obtain
9,000–10,000 rpm of the
engine at full throttle
G26 Marine
G231 Marine Diameter=65–75mm
Pitch ratio 1.9–1.4mm*
G38 Gas 18x10 @ 7,300
G45 Gas 20x10 @ 7,200
G62 Gas 22x10 @ 7,200
GT80 Gas 22x12 @ 7,200
24x10 @ 7,200


So if you can locate the 90 degree carb manifold adaptor it will cure your prob of having it too close to the cowl, which by the way they do not like.

I have a friend here who can get the 90 deg adaptor if you can not track one down over the there. I think that would be better for you then the power throat adaptor.

cheers
PEter

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RE: TF GS P47 Build - yeah another bloody one!! - 9/17/2005 12:56:48 AM   
Peter_OZ



Posts: 4572
Joined: 6/5/2002
From: Brisbane, , AUSTRALIA
Status: offline 		ok another problem for you. You have hard mounted the 62 to the firewall, the engines, especially at idle is going to shake the buggeries out of your airframe.

You need to mont it on soft mounts or the planes will fall to bits very soon. Just use the Great planes large scale engine isloation kit and modify it for the 62, it will also mean you do not need the ply spacer.

cheers
Peter

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RE: TF GS P47 Build - yeah another bloody one!! - 9/17/2005 1:18:44 AM   
Peter_OZ



Posts: 4572
Joined: 6/5/2002
From: Brisbane, , AUSTRALIA
Status: offline 		DWR,
these guys have the 90 adaptor

http://www.toni-clark.com/

cheers
Peter

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RE: TF GS P47 Build - yeah another bloody one!! - 9/18/2005 4:04:29 AM   
Canuck1