Mounting an engine on Dave Brown Mount - RCCanada - Canada Radio Controlled Hobby Forum
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Old 11-03-2004, 10:04 AM   #1
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Mounting an engine on Dave Brown Mount

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Instructions for my Ryan say to mount the engine on the mount so that the backplate is 5 7/8" from the firewall.

Even if I put the engine right at the end of the mount arms, I can only get it 5 5/8" from the firewall.

1) The 1/4" difference will make some change in the CG. How much won't be known till it is all assembled. Should I be overly concerned?

2)The REAL question I have is this: how close to the end of the arms can an engine be mounted ? Right at the end? 1/4" from the end?

It's a Saito 100 on a Dave Brown 90-1.20 size mount. I can post a pic later (if needed) once I get rid of a couple of viruses on my puter.
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Old 11-03-2004, 10:51 AM   #2
ken park
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Make a spacer!

When your only 1/4" short make a round ply spacer the same size as the mount backplate and epoxy it to the firewall. This will give you the distance your short eh!
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Old 11-03-2004, 11:44 AM   #3
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Good solution. I like it. If I add 1/2", that will allow me to move the engine back from the very ends of the arms as well, leaving 1/4" space at the forwardmost end of the arms. Thanks Ken.

Notice how the engine base tab has to extend. The GP mount that came with the arf is a half inch longer than the DB that I substituted. DB was easier to mount. Too bad it's shorter.

BUT, in regards to question 2, I'd still like to hear thoughts on that.
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