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  #1  
Old 11-09-2007, 03:22 AM
smokyray's Avatar
smokyray smokyray is offline
 
Join Date: Jan 2005
Location: "The Swamp" Central FL
Posts: 1,330
Default Big Tires...

Guys,

After landing my Harmon Rocket 2 on my rough, short and sometimes gooey swamp airstrip and having my 500 X 5 tires dig in and get my attention a few times I needed something new. Thanks to Steve Sampson, I used his idea and installed a set of 380 X 150 X 5 tires from Desser tire and vans pressure recovery pants on my Rocket. Steve's site shows nice pictures of the installation on his -4, the Rocket was very similar in fit and finish.
On the first flight the difference was amazing, really improved soft field handling, performance and looks better too, like they are the right tire for the HR2! I don't ever scrape my wheelpants on rocks or muddy ground and on asphalt it handles even better than before. I didn't lose one knot of speed over my previously closely faired Sam James pants and I think it may even be faster up high.
I will upload some pictures of the final product for your perusal. Again, THANKS Steve!!!

Rob Ray
HR2 "Bush Mod"

Last edited by smokyray : 11-09-2007 at 03:27 AM.
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  #2  
Old 11-09-2007, 08:52 AM
Steve Sampson Steve Sampson is offline
 
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Location: N. Yorkshire, England
Posts: 1,049
Default Tires/pants link

Your welcome! If anyone wants the link to the tires its here:

http://gikonfinsh.blogspot.com/2006/...res.html#links

or perhaps easier go here
http://gikonfinsh.blogspot.com/
and scoll down to October '06. There are several relevent entries.

Thanks again for the kind words Smokey.

PS If you want to land on my strip go here. That's what I need the tires for.
http://www.youtube.com/bananatime2
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G-IKON Build log here , or Index to blog here.
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Circuits at my 1000' strip.
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  #3  
Old 11-09-2007, 09:14 AM
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tcone1 tcone1 is offline
 
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Location: Fresno, CA
Posts: 286
Default The Greeen Swamp Aerodrome

Rob,

Don't be dissin the Swamp...I've mowed that runway a bunch, and miss my tractor therapy.

Tell Suzanne I said hello.

Tim
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  #4  
Old 11-09-2007, 09:54 AM
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David-aviator David-aviator is online now
 
Join Date: Feb 2005
Location: Troy. Missouri
Posts: 3,386
Default

Quote:
Originally Posted by Steve Sampson View Post
Your welcome! If anyone wants the link to the tires its here:

http://gikonfinsh.blogspot.com/2006/...res.html#links

or perhaps easier go here
http://gikonfinsh.blogspot.com/
and scoll down to October '06. There are several relevent entries.

Thanks again for the kind words Smokey.

PS If you want to land on my strip go here. That's what I need the tires for.
http://www.youtube.com/bananatime2
Thanks for the heads up on these tires, Steve.
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  #5  
Old 11-10-2007, 09:43 PM
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smokyray smokyray is offline
 
Join Date: Jan 2005
Location: "The Swamp" Central FL
Posts: 1,330
Default AM bushwheels for HR2...

Steve, One thing I found on the bigger tires was brake pad clearance is reduced with Cleveland brakes. I placed thin washers under my brake caliper rotor where it meets the wheel. So far after 25 hours the tires work very well especially when rolling over fireant mounds.. Tim, you need to come visit after a tropical storm has passed through. (Fd33 is gooey!)

Btw, the grass could use some mowing, when are you coming back?

Smokey
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  #6  
Old 11-11-2007, 12:47 AM
TGRV7 TGRV7 is offline
 
Join Date: Dec 2006
Location: El Paso, Texas
Posts: 105
Default

please post some pics.
I wonder what the weight delta is?
I am curious.

Thx
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  #7  
Old 11-11-2007, 07:45 AM
Steve Sampson Steve Sampson is offline
 
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Location: N. Yorkshire, England
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Smokey - I am really struggling to understand why you needed the thin washer. Was the part that holds the outer pad (top left in the attached picture) brushing against the tire?
http://bp0.blogger.com/_n0oPgd-_rrk/...h/HPIM1254.jpg
It appears to have adequate room in my case. I cant think what other problem could occur. The problem is exacerbated by the fact 'the brake caliper rotor' conveys nothing to me.

Thanks Steve.

"T" - you asked for pictures. Scroll down to my previous post. You will also find the weight delta.
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G-IKON Build log here , or Index to blog here.
RV4 #4478 - Flying since 16th June '08. First flight video here.
Circuits at my 1000' strip.

Last edited by Steve Sampson : 11-11-2007 at 07:47 AM. Reason: re arrange info - ambiguity
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  #8  
Old 11-11-2007, 08:50 AM
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MacNab MacNab is offline
 
Join Date: May 2007
Location: DVT
Posts: 238
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Quote:
Originally Posted by Steve Sampson View Post
Smokey - I am really struggling to understand why you needed the thin washer. Was the part that holds the outer pad (top left in the attached picture) brushing against the tire?
http://bp0.blogger.com/_n0oPgd-_rrk/...h/HPIM1254.jpg
It appears to have adequate room in my case. I cant think what other problem could occur. The problem is exacerbated by the fact 'the brake caliper rotor' conveys nothing to me.

Thanks Steve.
Steve,

That clearance is closer than you may realize. When side loads are applied to the tire the tire will rub and possibly bind on the brake caliper. This is a common problem with planes using Bushwheels and the fix is usually a spacer between the wheel and the brake disk. The spacer I used on my 6" Maule wheels was a approx 1/8" thick ring the same dimensions as the inside of the brake disk where it meets the wheel. That 1/8" extra caliper clearance is operationally significant. Could probably use a thinner spacer on the smaller tires and wheels like Smokey did and get the job done. You might be surprised at how much these tires can flex under side loads, especially when the tire pressure is lower than normal.

I really do like your idea though, and I'm going to investigate this mod further because a couple of the places I like to go are soft and/or rough. I little more tire floatation and wheel pant clearance would increase my comfort level and maybe save a little wear and tear on the landing gear and airframe on rough strips. I'd rather not have to remove my panties every time I want to go into these types of strips.
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RV-6, AT-301, G-164, C-188...

Last edited by MacNab : 11-11-2007 at 09:16 AM.
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  #9  
Old 11-12-2007, 12:56 AM
Steve Sampson Steve Sampson is offline
 
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Location: N. Yorkshire, England
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Default

Doug, now I understand. That makes eminent sense. A thin washer it is. Thanks.
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G-IKON Build log here , or Index to blog here.
RV4 #4478 - Flying since 16th June '08. First flight video here.
Circuits at my 1000' strip.
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  #10  
Old 11-12-2007, 10:45 AM
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rocketbob rocketbob is offline
 
Join Date: Jun 2006
Location: 8I3
Posts: 2,780
Default

I have a friend that tried 600x6 wheels and tires on his HR2 and it shimmied like crazy. Likely because the toe-in/out was so far out that having the additional contact area of the larger tires just made it worse. I have Van's wheelpants for my F1 and regularly land on rough runways with my -6, many times which I wished I had bigger tires. Flying a J3 spoils you in that regard. So I guess I need to order some different tires!
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