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Extending engine bearers?
Page 1 of 1
Extending engine bearers?
Ivanhoe Tue Jun 19, 2012 12:59 pm
I'm looking for ideas from our members who fly larger engines.
I decided to pull my old Black Ghost combat model (UK members may know the model) out of retirement and fit my PAW 19, which has yet to fly since I obtained it from Indra.
However, I soon realised a fairly major problem......
As you will see the engine bearers (origionally holding an Enya 15) are too short for the PAW.
I am open to ideas as to how to lengthen the bearers, keeping in mind that.. I don't really want to cut the existing ones out, I want to avoid any lengthening of the nose if I can, the PAW is a heavy engine and the CG would end up on the leading edge if I didn't add tail weight (which I do not want to do!)
There isn't room for the obvious alloy mounting plate, and cutting off the bearers and screwing a mount to the nose is out because the tank is right up against the firewall!
I suppose the obvious answer is "Don't fit that engine to that model!"
I never have simple problems!
Any brilliant ideas would be VERY welcome!
I decided to pull my old Black Ghost combat model (UK members may know the model) out of retirement and fit my PAW 19, which has yet to fly since I obtained it from Indra.
However, I soon realised a fairly major problem......
As you will see the engine bearers (origionally holding an Enya 15) are too short for the PAW.
I am open to ideas as to how to lengthen the bearers, keeping in mind that.. I don't really want to cut the existing ones out, I want to avoid any lengthening of the nose if I can, the PAW is a heavy engine and the CG would end up on the leading edge if I didn't add tail weight (which I do not want to do!)
There isn't room for the obvious alloy mounting plate, and cutting off the bearers and screwing a mount to the nose is out because the tank is right up against the firewall!
I suppose the obvious answer is "Don't fit that engine to that model!"
I never have simple problems!
Any brilliant ideas would be VERY welcome!
Ivanhoe- Diamond Member
- Posts : 1752
Join date : 2011-09-30
Location : Northern Ireland
Re: Extending engine bearers?
Kim Tue Jun 19, 2012 1:28 pm
I suppose that two extra holes, drilled in the engine's mounting flange, WOULD NOT be an option????
Kim- Top Poster
Posts : 8625
Join date : 2011-09-06
Location : South East Missouri
Re: Extending engine bearers?
Ivanhoe Tue Jun 19, 2012 2:09 pm
Kim wrote:I suppose that two extra holes, drilled in the engine's mounting flange, WOULD NOT be an option????
Errr, in a word, no!
Ivanhoe- Diamond Member
- Posts : 1752
Join date : 2011-09-30
Location : Northern Ireland
Re: Extending engine bearers?
daviddiag Tue Jun 19, 2012 2:10 pm
Column A: Do not fit this engine to this plane. Column B: Hack up plane. Please chose one from column A or Column B.... 
daviddiag- Silver Member
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Age : 73
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Re: Extending engine bearers?
Admin Tue Jun 19, 2012 2:13 pm
I was in a hurry so I just did this quick. You get what I mean right? Just cut some metal bars/plates that are about the same size of the beams on the engine and just tighten them up on the other side of the mount.
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Re: Extending engine bearers?
Ivanhoe Tue Jun 19, 2012 2:24 pm
Admin wrote:
I was in a hurry so I just did this quick. You get what I mean right? Just cut some metal bars/plates that are about the same size of the beams on the engine and just tighten them up on the other side of the mount.
Now, that would work! why didn't I think of that? I was stuck on the idea of plates on the other side of the bearers, but discounted that because it would push the engine off the centreline.
Many thanks! There is no doubt that the the motto of this forum should be...........
"The impossible we do at once, miracles take a little longer!"
Ivanhoe- Diamond Member
- Posts : 1752
Join date : 2011-09-30
Location : Northern Ireland
Re: Extending engine bearers?
John Goddard Tue Jun 19, 2012 4:08 pm
I agree with Jacob.
In our club trainer there is a very cheap and extremely
Nasty alu mount that works along these lines.
I say cheap and nasty but it works and has shrugged off
Lots of attempts to break it.
In our club trainer there is a very cheap and extremely
Nasty alu mount that works along these lines.
I say cheap and nasty but it works and has shrugged off
Lots of attempts to break it.
John Goddard- Diamond Member
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Join date : 2011-11-24
Age : 60
Location : Leyton North East London
Re: Extending engine bearers?
nitroairplane Tue Jun 19, 2012 4:20 pm
Good to see that PAW sitting in a plane!Ivanhoe wrote:I'm looking for ideas from our members who fly larger engines.
I decided to pull my old Black Ghost combat model (UK members may know the model) out of retirement and fit my PAW 19, which has yet to fly since I obtained it from Indra.
However, I soon realised a fairly major problem......
As you will see the engine bearers (origionally holding an Enya 15) are too short for the PAW.
I am open to ideas as to how to lengthen the bearers, keeping in mind that.. I don't really want to cut the existing ones out, I want to avoid any lengthening of the nose if I can, the PAW is a heavy engine and the CG would end up on the leading edge if I didn't add tail weight (which I do not want to do!)
There isn't room for the obvious alloy mounting plate, and cutting off the bearers and screwing a mount to the nose is out because the tank is right up against the firewall!
I suppose the obvious answer is "Don't fit that engine to that model!"
I never have simple problems!
Any brilliant ideas would be VERY welcome!
nitroairplane- Top Poster
- Posts : 6956
Join date : 2011-04-11
Location : London -
Re: Extending engine bearers?
Cribbs74 Tue Jun 19, 2012 10:35 pm
Is this a Balsa model?
If so it's quite simple, sink the firewall or just cut a hole in existing firewall the diameter of the rear of the crankcase. We are only talking a half a centimeter here. You have enough space on the bearer. It's the crankcase that's in the way.
Being the builder you are, you can surely make it look pretty.
If so it's quite simple, sink the firewall or just cut a hole in existing firewall the diameter of the rear of the crankcase. We are only talking a half a centimeter here. You have enough space on the bearer. It's the crankcase that's in the way.
Being the builder you are, you can surely make it look pretty.
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Join date : 2011-10-24
Age : 50
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Re: Extending engine bearers?
Ivanhoe Sat Jun 23, 2012 6:42 am
Well, I shoehorned the PAW in.......
The rear holes in the plates are tapped to take the bolts, then nuts added for security.
Just need some flying weather, and the old girl can start circling again (probably considerably faster than last time!)
The rear holes in the plates are tapped to take the bolts, then nuts added for security.
Just need some flying weather, and the old girl can start circling again (probably considerably faster than last time!)
Ivanhoe- Diamond Member
- Posts : 1752
Join date : 2011-09-30
Location : Northern Ireland
Re: Extending engine bearers?
Admin Sat Jun 23, 2012 2:54 pm
Ivanhoe wrote:Well, I shoehorned the PAW in.......
The rear holes in the plates are tapped to take the bolts, then nuts added for security.
Just need some flying weather, and the old girl can start circling again (probably considerably faster than last time!)
Exactly how I pictured it in my mind!
Admin- Administrator
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Join date : 2010-07-27
Location : Roseville, Minnesota -
Re: Extending engine bearers?
Ivanhoe Sat Jun 23, 2012 4:24 pm
Yes, thanks again for the suggestion
Wilf
Wilf
Ivanhoe- Diamond Member
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Join date : 2011-09-30
Location : Northern Ireland
Re: Extending engine bearers?
RknRusty Sat Jun 23, 2012 5:06 pm
Nice work.
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