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H9 60 Size P-47 Thunderbolt-Build & Flying

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H9 60 Size P-47 Thunderbolt-Build & Flying

Old 04-01-2008, 09:02 AM
  #826  
KC36330
 
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying

i just put a Miss America together for another guy and did the maiden on it with an OS 91 four banger and the G20ei on my Jug not only sounds better, has more vertical performance and is faster but with it's dinky little 8oz fuel tank i get a 25 min flight. the fuel economy of the gassers is a major plus in my book, i pay right at 4 bucks a gallon for 100 octane low lead and can get roughly 20 flights off that gallon.

as soon as i finish up a couple of other planes I'm working on for people I'm gonna do some prop swapping and see how she performs, right now with the 15x6 Competition APC I'm on the rich side to keep the RPM under 10K, i wasn't really expecting the performance this little engine is putting out.
Old 04-01-2008, 06:27 PM
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying

BIRMAN,

Look inside the fuse at the backing on your firewall. Mine was in the shape of a plus sign, and was designed to add reinforcement to the mounting holes only. I also mounted my Saito 100 inverted, but when I drilled out the mounting holes, discovered they didn't go through the reinforced part of the firewall. I installed some additional plywood in those empty spaces, and everything worked out fine. It was definitely worth the trouble for strength, and I cannot understand why anyone would leave the engine sticking out if there was any possibility of avoiding it. I would much rather alter my engine preference to keep things under the cowl. Also, no problems with siphoning using a 3 line setup.
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Old 04-01-2008, 06:44 PM
  #828  
brewmanbrett
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying

Has anyone heard anything from 60 Buick? He did some really cool stuff on his 2 H9 Hellcats and I can't wait to see how Voodoo comes out. I've been disappointed to see how many bone-stock birds people are showing here. This thread is sure to wane if people don't continue to improvise at least a little bit. For those considering a new trim scheme for their old Jugs, try out this website. [link=http://www.wp.scn.ru]www.wp.scn.ru[/link]
Old 04-01-2008, 06:58 PM
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying

brewmanbrett, thanks for the info. Did you use the existing firewall lines to line up your inverted Saito 100? Would you possible have any close up pics of you installation?
Birman
Old 04-01-2008, 07:38 PM
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying

Birman,

I mounted my 125 inverted and used the marks on the firewall to center the shaft. I did end up having to get a Cline regulator because of siphoning, but this is the first time I have ever had to do that with many Saito inverted engines.

I also used one of these [link=http://www.keleo-creations.com/product_info.php?cPath=24_59&products_id=96&osCsid=r02gnpavviujf8jpabplkdda15]Keleo[/link] so I had to only cut the cowl for airflow and needles
Old 04-02-2008, 01:04 AM
  #831  
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying

Hi my name is jacob i live in oregon and i bought my p47 last year and still haven't flown it :[
I had a 24cc gasser in it and decided to go with a glow instead.
my question is when mounting the engine mount how did you guys get the nuts in the back of the firewall?
Old 04-02-2008, 06:57 AM
  #832  
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying

reach in with your hand. I've got big hands and it was fairly easy to get in there, start the nuts, and tighten them up.
Old 04-02-2008, 01:21 PM
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying

BIRMAN,

The first thing I did was mount the engine to the engine mount, then draw a line down the side of the engine mount that lines up with your driveshaft. Match this line up with the horizontal factory line on your firewall.

Then measure make sure the vertical line on the firewall is directly centered between the engine mounts.

Now take a sharpie or pencil and stick it through the mounting holes on the engine mount to mark where to drill your new holes.

This method will keep the built-in right and down thrust, and keep the propeller at the centerline of the aircraft for when you mount your cowl.

You may want to put the extra firewall backing in before this step to save you drilling twice. It's a bit labor intensive, but worth it. I'll try to take some pictures for you tonight.

brewman
Old 04-02-2008, 06:56 PM
  #834  
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying

Thanks brewman. I'll look forward to pictures when you get time.

Birman
Old 04-05-2008, 07:22 PM
  #835  
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying

BIRMAN,

Hope this reaches you in time to be of assistance. Sorry about the resolution.

In the 1st pic you can see how I drew the line down the engine mount that corresponds with the driveshaft. 2nd pic shows this from a different angle.

3rd pic shows the vertical firewall line directly between the engine mounts. Notice that this also lines up with protrusion along the bottom of the engine itself. Maybe you can get someone to hold the plane with the firewall facing the ceiling while you position the engine, then mark your new drill holes.

4th and 5th pics show the additonal plywood backing that I epoxied to the backside of the firewall. This was absolutely necessary as you can see the blind nuts overlap the existing "plus sign" shaped backing from the factory.

Pics 6 & 7 show how this will maintain the built-in 'right and down' thrust, and allow the propeller to be aligned "dead center" even though, at the firewall, the engine appears to be mounted incorrectly.

Good Luck!

brewmanbrett

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Old 04-06-2008, 07:48 AM
  #836  
Birman
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying

brewman, thank you very much for your help. I know you went through a lot of trouble removing the cowel and shooting the pictures. I really appreciate what you have done. It'll make my assembly much easier.

Birman
Old 04-08-2008, 09:23 AM
  #837  
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying

Has anyone had a problem with a huge gap between the root ribs when trying to join the wings? I have a huge gap in my wings. When I lay the edge of a straight edge along the root ribs, there doesn't appear to be any gaps. However, when I try to join, the gap is there. I am afraid to start sanding because I don't really know where to sand due to the straightness of the root ribs.

Has anyone else had this problem and if so, how did you solve it?

Thanks,
Birman
Old 04-08-2008, 11:27 AM
  #838  
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying

call Horizon and get a new wing set.
Old 04-09-2008, 03:55 PM
  #839  
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying

Hi guys I think mine is ready to fly. There's a clip on RCU.
It has a BCMA 26cc in it. I'll post video of the maiden if I can.

http://www.rcuvideos.com/item/LGKSL2B11RJJS6BM

Old 04-10-2008, 02:18 AM
  #840  
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying

What did you guys do with the firewall who are running the G20 gasser? I just noticed while looking at mine that it has the + shape reinforcement to it for the slanted motor mount. Also, I was talking to a guy at the local air field last weekend and he put the G20 in his and recommended puting tail braces on it as he has alot of flutter with his due to the speed the G20 provided. Have any of you had any issues with this? He was running a 2 blade prop on it. Sorry, im not sure what size. Would a 3 blade slow it up a bit to prevent the possible tail flutter?? If so, what size 3 blade works well with the G20?? I would like it to look somewhat scale with a 3 blade prop.. I run at about 4500 ft above sea level, so I will lose some power with it im sure. This will be my 2nd RTF, so im still fairly new to all the tricks you veterans have up your sleeves. Any input will be appreciated.
Old 04-10-2008, 07:13 AM
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying

i took two pieces of 1/4" (which is really 3/16" ) ply and laminated them, for a total thickness of 3/8" then took it and cut it to the shape of the G20 mount, sanded the firewall to roughen it up good and laminated it to the firewall.
Old 04-10-2008, 07:38 PM
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying

F shawn68, Is your friend talking real flutter or more like a wiggle of the rear end? Both of the one's at our field wiggle at any speed. Don't know why; short couple or small rudder or both? I have a 15 x 8 three blade on a Saito 125. I fly at 4500' also.
Old 04-10-2008, 08:07 PM
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying


ORIGINAL: Ichy

Both of the one's at our field wiggle at any speed. Don't know why; short couple or small rudder or both?
it's a scale trait, it's very pronounced in most Corsairs so if you don't like it stay away from them. [8D]
Old 04-10-2008, 11:47 PM
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying

Ichy, im not sure which it is. He just told me to brace the tail because he noticed flutter. He flies alot of giant scale, so im thinking he might be flying it pretty fast or something. He has had some of his giants come apart due to speed as well.
Old 04-11-2008, 07:11 AM
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying


ORIGINAL: f_shawn68

He has had some of his giants come apart due to speed as well.
sounds like poor build quality to me. properly built airframes, especially giant scale will hold together with no problems as the drag they produce keeps them well below a velocity to cause failure and the power required to overcome that drag is phenomenal.
Old 04-11-2008, 08:03 AM
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying

"it's a scale trait, it's very pronounced in most Corsairs so if you don't like it stay away from them."

Yikes! And I just picked up a TF GS corsair a few days ago! The wiggle does not bother me other than it just looks weird. I am not sure how one would add braces for support. I would think make sure that the linkages are good and tight and you could seal the gap on the control surfaces if you are worried about flutter.
Old 04-11-2008, 10:25 AM
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying

Thanks for your input. It just might be poor build on his part. I guess I will be buying the G20 if you guys are saying it will handle it. He said it was flutter and not tail wag. I can deal with the tail wag. Im sure throttle control would help as well. Im not looking for an acrobat or racer. I just want a nice warbird. I have other planes for that other stuff. I originally wanted a spitfire, but the owner of the hobby shop talked me into the P-47. He told me it had a larger tail wing and would help a new guy to warbirds get used to their flying traits. I probably wont be ready to fly this until later this summer, so it will be a take my time and do it right project. Thank you guys for sharing your knowledge with a new guy. Its much appreciated.
Old 04-11-2008, 11:45 AM
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying


ORIGINAL: f_shawn68

............... Im sure throttle control would help as well.

i fly turbines most of the time so I'm a left stick is always in the ON position kind of flier, the G20 is turning 10K with an APC 15x6, it's moving along pretty good and I've not had any flutter problems at all. i think if you build it right you won't have any problems either and you'll absolutely love the sound and fuel economy of the G20.
Old 04-17-2008, 08:16 PM
  #849  
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying

Good Day

All I needed to do was cut one opening for one valve cover with the engine in the stock location
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Old 04-24-2008, 02:38 AM
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Default RE: H9 60 Size P-47 Thunderbolt-Build & Flying

what 3 blade prop would you recommend for the G20? I would like to get some nice scale looks during the build.

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