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World War II
Discuss WWII and the era directly before and after the war from 1935-1949.
Hosted by Rowan Baylis
Wiring a Radial Engine
md72
#439
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Washington, United States
Joined: November 05, 2005
KitMaker: 3,820 posts
P47 Heaven: 27 posts
Posted: Saturday, January 13, 2018 - 11:17 AM GMT+7
Thanks, the pre-fitting sounds like a good idea. Yes, I's not very big. Less than 1" tip to tip.

Joel_W
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New York, United States
Joined: December 04, 2010
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Posted: Saturday, January 13, 2018 - 10:37 AM GMT+7
Mark,
I haven't wired a 1/72 scale engine since the 70s. These days 1/48 scale is a real challenge.

Each cylinder has two spark plug wires, one dead center in the front of the cylinder, and the 2nd one dead center on the top. The PE wiring harness must really be small with very thin flat wires. From the instructions they have rounded ends to make gluing them easier. I'd use them that way for the top of the cylinders with CCA glue. For the front of the cylinders I'd prefer to cut them off and drill a hole to insert the wire gluing it in place with CCA glue, but they don't look long enough so you'll have to CCA glue them with the tabs, but bend the tab so that it's below the wire rather then on top. The visual effect will be that the wire is attached to the plug, the other way just won't have the same effect.

Just take your time, wear your Optivisor, and you'll get through this just fine.

maybe someone can post a picture or two of how a 1/72 scale radial engine looks wired up.

Joel

Merlin
Staff MemberSenior Editor
AEROSCALE
#017
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United Kingdom
Joined: June 11, 2003
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Posted: Saturday, January 13, 2018 - 09:53 AM GMT+7
Hi Mark

You definitely don't need to go for epoxy on something like this - the slow drying time would far outweigh any strength advantages.

My first thought would be CA, but to be honest, I'd wait until you've dry-fitted the ignition harness and curled the wires to their approximate final position before making a decision. You may well be able to use something like Gator's glue to hold them in place. Unless something's under serious tension, it can be a great solution and a lot friendlier to use with its water clean-up.

All the best

Rowan
md72
#439
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Washington, United States
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Posted: Saturday, January 13, 2018 - 05:00 AM GMT+7
Thanks guys! I'm leaning towards the superglue solution. This could work out yet..
mrockhill
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Pennsylvania, United States
Joined: June 17, 2009
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Posted: Saturday, January 13, 2018 - 04:48 AM GMT+7
Sometime soon Ill be facing the same lil engine you are. Im thinking im going to use fine copper wire for my harness as I have the weekend edition w/o PE. I should only need 18 holes for the 36 wires in the ignition ring as I plan to fold the wire in half and push the folded end into the hole leaving 2 loose ends. Ill drill another set of holes all the way through the cylinder heads to feed the wire through so even if the glue lets go it wont hang loose.

The 2nd wire on each cylinder I think goes up and over the top so shouldnt be visible where it terminates. At least that's my plan right now while im still horsing around in the cockpit. You can anneal the PE harness over a match or a lighter which should help the PE be less springy if that's of any help.
greif8
#277
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Bayern, Germany
Joined: January 17, 2006
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Posted: Friday, January 12, 2018 - 08:47 PM GMT+7
Hi Md, I would use super glue. The PE simulating the wiring harness will not be load bearing or handled once in position, so you should not need the extra strength of epoxy.

An alternate method might be to use fine copper wire to simulate the wiring harness. It would be a challenge to drill out the harness ring, which looks like it is simulated on Part 31. Drilling spark plug hole in the cylinder heads would not be a tough. I build mostly 1/32, with an occasional foray into 1/48, and that is how I always make the wiring harness. Again, 1/72 might be too small to pull that off, but if it is not, the time spent making the wiring harness using the technique above is time well spent in my opinion.

Ernest


Quoted Text

Help! I've never tackled an engine this detailed on a 1/72nd kit.

A 5 part engine? 36 spark plug wires? I'm sure I need epoxy or superglue, but how? No way I can get that many wires routed and placed during the epoxy's 5 minute pot life. Mix a batch fix a few, mix a new batch and fix a few more, lather, rinse and repeat? What about superglue, set out a small puddle, transfer a dot to the 'spark plug', apply a dot of accelerator to the wire and press to the spark plug, over and over for 36 spark plugs?

md72
#439
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Washington, United States
Joined: November 05, 2005
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Posted: Friday, January 12, 2018 - 06:40 PM GMT+7
Help! I've never tackled an engine this detailed on a 1/72nd kit.

A 5 part engine? 36 spark plug wires? I'm sure I need epoxy or superglue, but how? No way I can get that many wires routed and placed during the epoxy's 5 minute pot life. Mix a batch fix a few, mix a new batch and fix a few more, lather, rinse and repeat? What about superglue, set out a small puddle, transfer a dot to the 'spark plug', apply a dot of accelerator to the wire and press to the spark plug, over and over for 36 spark plugs?