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RE: Recent VK Cherokee Babe build - 8/23/2010 6:37 PM   
buzzard bait


 

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From: Ithaca, NY, USA
Status: offline 		Slim, I pulled out the plans you kindly sent to me and got out some engines to put up against the plan. My 40 FP would fit if you took out the shim and mounted directly to the firewall. I assume that means the LA would too, except you would need a small cutout for the remote needle. If you want the thrust offset you could grind down the shim so that it tapers to nothing at the starboard edge.

Another alternative might be to use a standard Dave Brown motor mount and cut out enough material between the arms, which doesn't have any screw holes in it, if you see what I mean. Then you could move the motor to the back and not have the thickness of the mount. It looks like this would work on the DB 4045 size mount. You'd be coming fairly close to the screw holes, but I think there would be enough meat left to have a secure mount (the DB 3035 mount also fits the OS 40 plain bearing engines, but if you cut it out there wouldn't be much left). You might even be able to grind thrust offset into the motor mount.

The other alternative is to get a TT .25 GP or an old OS 25 FP (or the even older 30 for that matter), or Enya 25ss or 30ss. Then there would be no problem with the mounting. You'd have to stick to the plain bearing 25-30s because the BB types are just as long as your 40 LA. An OS 25 FP is as strong as the old OS 30. With modern gear you'd still have a very good performer.

Jim

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RE: Recent VK Cherokee Babe build - 8/24/2010 3:28 AM   
slim_pkns



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Status: offline 		Oh my God! I can't believe there isn't a back plate style mount for the OS .40 LA! WTH?! I find them for gas engines, but not glow.

What if I take off the nylon backplate and drill holes through the mounting block and firewall where they are located> Then get longer screws and just mount it that way using a good bit of Lock Tight so they don't vibrate out. That looks to be the way a backplate mount would work anyway except there are separate holes for mounting to the firewall rather than using the same holes for the backplate and the mount.

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RE: Recent VK Cherokee Babe build - 8/25/2010 7:19 PM   
Bax


 

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quote:

ORIGINAL: slim_pkns

Oh my God! I can't believe there isn't a back plate style mount for the OS .40 LA! WTH?! I find them for gas engines, but not glow.

What if I take off the nylon backplate and drill holes through the mounting block and firewall where they are located> Then get longer screws and just mount it that way using a good bit of Lock Tight so they don't vibrate out. That looks to be the way a backplate mount would work anyway except there are separate holes for mounting to the firewall rather than using the same holes for the backplate and the mount.


The kind of mount you're asking about just don't exist for glow engines...at least not any more. Remember, your kit was designed in the 1960's or so. Just use a mount like this one:

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXJ771&P=ML



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RE: Recent VK Cherokee Babe build - 8/25/2010 10:53 PM   
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Status: offline 		Slim, the reason for the aluminum plate is so you can get it off again, and tighten as necessary. If I understand your method, the screws are on the back of the firewall. When the wooden firewall compresses, as it will over time, how will you tighten them up again?

Jim

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       Post #: 204

RE: Recent VK Cherokee Babe build - 8/26/2010 8:09 PM   
ARUP


 

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quote:

ORIGINAL: slim_pkns

Quick update... been having trouble posting from my personal computer.

I finished the right half of the wing this weekend and I'm ready to start shaping the major parts! I'll try to post some pics tonight.

The wings were not easy to build and there are a couple of spots in the leading edge sheeting that could have been glued tighter to the front tip of the the wing ribs. Note to self... pins don't hold wing sheeting down very well. The 1/16'' sheeting slides up the pins too easily.

Insert pins at different angles to remedy sheeting sliding up the pins. This is a pretty airplane. I've always wanted to build one. So many airplanes so little time!

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RE: Recent VK Cherokee Babe build - 8/26/2010 9:36 PM   
Cherokee Flyer


 

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Status: offline 		Another mount that might work:        http://www.mecoa.com/acc/mounts/edson/edson.htm

L.

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       Post #: 206

RE: Recent VK Cherokee Babe build - 8/28/2010 4:49 AM   
slim_pkns



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Status: offline 		Thanks ARUP and thanks a lot everyone for the help and advice. I'm still not sure what I want to do yet. I don't think I've exhausted all ideas. In the meantime, I'm going to work on the rest of it until I'm left with a complete model with no engine if necessary!!!

I may have to design a new mount and find somebody to machine it. One that has 2 deg right and a little down already in.

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RE: Recent VK Cherokee Babe build - 12/5/2012 9:51 PM   
slim_pkns



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Status: offline 		Howdy all! It's been a long, long time!

Work is finally slowing down a bit and I have time for hobbies now. I've been back to work on the VK Cherokee Babe! I left it alone on the building board for a couple of years while I struggled with an engine mount. I feel pretty stupid, but leason learned.... the metal plate that came with the kit IS the engine backplate mount! All I needed to do was drill holes for the screws and counter sink the backplate screws so it sits flush against the firewall and I would have been good to go. I ended up buying a Viper backplate mount from Great Planes before I figured that out.

Anyway.... the build is on and I'm already covering. I'll have some pictures to add this week. Hopefully the muffler I need will be in this week and I can finish her up before Christmas.

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RE: Recent VK Cherokee Babe build - 12/5/2012 10:42 PM   
buzzard bait


 

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From: Ithaca, NY, USA
Status: offline 		Oh those old metal backplate mounts...you never see those anymore, no wonder you got thrown by it. They were popular around the 70s I think.

I won't be starting one soon, but I'm still glad to have the plans socked away. Our club is going to do a biplane event next year, so bipes are top on the priority list now.

Looking forward to seeing your Cherokee Babe get finished up!

Jim

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       Post #: 209

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All Forums >> RC Airplanes >> Golden Age, Vintage & Antique RC >> RE: Recent VK Cherokee Babe build
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