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Author Topic: Motor mount material  (Read 4946 times)

Offline Zuriel Armstrong

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Motor mount material
« on: July 25, 2014, 06:49:57 AM »
I know G10 is a preferred material for motor mounts. What is a plywood alternative for full fuse planes. Im building a plane for an EFlite 15 motor.
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Offline Bob Hudak

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Re: Motor mount material
« Reply #1 on: July 25, 2014, 09:40:18 AM »
I laminate a piece of G4(red fiber board)to a piece of 1/8" plywood. The G4 keeps the motor mount from digging into the plywood.
Bob
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Offline Randy Powell

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Re: Motor mount material
« Reply #2 on: July 25, 2014, 09:51:19 AM »
I've been using 1/8" PC board.
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Online David Hoover

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Re: Motor mount material
« Reply #3 on: July 25, 2014, 10:07:35 AM »
Get one of Bob Hunt's 'Hard Nose' motor mounts.  All you have to do is shape the outside to fit your situation.  The mounting and cooling holes are already machined into it.
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Offline Dean Pappas

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Re: Motor mount material
« Reply #4 on: July 25, 2014, 02:15:17 PM »
Hi guys,
and the G10 material of the hard-nose mount glues beautifully with epoxy.
take care,
Dean P.
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Online Dennis Adamisin

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Re: Motor mount material
« Reply #5 on: July 25, 2014, 04:03:50 PM »
If you are using the X-mount that comes with the motor then I think a 1/4" birch ply is the way to go.  Also much easier to integrate into the wooden fuselage structure.

If you are front mounting the motor without an X-plate then the hard nose is a good hard "forever" mounting surface, and the G10 can be prepped to be captured by epoxy.  However even with a front mount, I have made several successful installations using 1/4" ply, but I also line the mounting holes with brass or alum tubing to help resist crushing.  Again it is much easier to integrate the wood firewall into the front end structure.
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Online Bob Hunt

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Re: Motor mount material
« Reply #6 on: July 25, 2014, 06:26:05 PM »
Not to disagree with my old buddy Dennis, but...

The only problems that I've had with front mounting were when I used any type of plywood mount. That is what prompted me to huddle with Dean Pappas and come up with the Hardnose G-10 Front Mount. Dean did the actual design work on the mount when I told him of the troubles with plywood mounts.

They are extremely easy to mount in either a built-up or a profile fuselage and I have a PDF instruction manual that completely explains and illustrates the sizing and mounting steps that is free for the asking. Just send me an email requesting the manual and I'll forward it immediately.

My good friend, Buddy Wieder flies a lot, and his first electric powered Ryan's Eagle model had a plywood front mount. It lasted less than a hundred flights before giving him fits. We retrofitted a Hardnose Front Mount into his ship and he had no further problems over many hundreds of flights. He installed a Hardnose mount in his newest Ryan's Eagle and has flown hundreds of trouble free flight with that model as well.

Later - Bob Hunt
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Offline Motorman

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Re: Motor mount material
« Reply #7 on: August 06, 2014, 08:03:37 AM »
I use 2 pieces of 1/8 birch 5 ply epoxied together. Then I epoxy a very thick piece of fiberglass on the front and put it face down with weight on a flat plate (with cling wrap) to cure. 2 flathead screws with epoxy go into a maple block to hold it. Bob, no offense but your G10 profile in a head on collision I would win.



MM
« Last Edit: August 06, 2014, 08:27:38 AM by Motorman »
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Online Bob Hunt

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Re: Motor mount material
« Reply #8 on: August 06, 2014, 04:41:53 PM »
Quote from: Motorman on August 06, 2014, 08:03:37 AM
I use 2 pieces of 1/8 birch 5 ply epoxied together. Then I epoxy a very thick piece of fiberglass on the front and put it face down with weight on a flat plate (with cling wrap) to cure. 2 flathead screws with epoxy go into a maple block to hold it. Bob, no offense but your G10 profile in a head on collision I would win.



MM

Precisely how often do you experience head-on collisions Motorman? LL~

Bob
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Offline john e. holliday

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Re: Motor mount material
« Reply #9 on: August 07, 2014, 09:19:51 AM »
Maybe he means vertical inadvertent landings onto paved surfaces.   (can't believe I got it spelled right)
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Offline Zuriel Armstrong

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Re: Motor mount material
« Reply #10 on: August 07, 2014, 12:24:13 PM »
Since I'm not planning on any head-ons, I called Bob and ordered some G10.

Thanks for the replys.
« Last Edit: August 07, 2014, 06:34:18 PM by Zuriel Armstrong »
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Offline Randy Powell

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Re: Motor mount material
« Reply #11 on: August 07, 2014, 11:14:41 PM »
I'm using some 1/8" PC board.
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 Randy Powell

Online Bob Hunt

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Re: Motor mount material
« Reply #12 on: August 08, 2014, 06:23:14 AM »
Hi Randy:

PC board is G-10... y1

The G-10 that I use in my Hardnose Motor Mount plates is dyed black to look like carbon (That's how it comes from my supplier...), but rest assured it is the same material as the greenish G-10 PC board material.

Bob
« Last Edit: August 08, 2014, 11:16:44 AM by Bob Hunt »
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Offline Randy Powell

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Re: Motor mount material
« Reply #13 on: August 11, 2014, 10:06:51 PM »
Yea, sort of greenish, yellow. Got if from Boeing surplus a couple of years ago.
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Offline Motorman

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Re: Motor mount material
« Reply #14 on: August 18, 2014, 11:19:53 AM »
The way the mount is slotted in there looks like there's not much wood top and bottom so it's almost like gluing the mount to the front of the fuselage with everything forward just weight.  If that's all it takes to hold it, I've really been over engineering my mounts. Is there any hardwood in there, are you going to put blocks behind it?

MM
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Offline Horby

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Re: Motor mount material
« Reply #15 on: August 30, 2014, 09:08:46 PM »
I like to use basswood in place of the maple. It is a bit lighter but I like the added stiffness it brings without weight.

Warren
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