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Cox Engine of The Month
Engine mount
Page 1 of 1
Re: Engine mount
If the crankcase fits well in its bed then the lateral forces acting on the mounting beam will not be critical even if there is only little meat left between the bolt and the bed, IMHO
balogh- Top Poster
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Posts : 4747
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary
Re: Engine mount
That would definitely help relieve the lateral load on the bolts..
balogh- Top Poster
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Posts : 4747
Join date : 2011-11-06
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Location : Budapest Hungary
Re: Engine mount
You have sufficient material to hold the bolts. I would use blind nuts opposed to using nuts. Rough em up and epoxy them into the nose. The holes are drilled. Anything after those holes is meaningless. In fact I've found engines that are fit tight into the opening have a tendency to cause unwanted vibrations requiring the bearers and doublers needing to be cut back. Due to the fact that your mounting a TD profile, adding a 3/32" or 1/8" shim of aluminum under your engine lug would also offer a larger footprint not too mention it will assist in making your tank work correctly.
Ken Cook- Top Poster
- Posts : 5455
Join date : 2012-03-27
Location : pennsylvania
Re: Engine mount
There's really not enough meat there for blind nuts!.....ya ..the fuel tank is another conundrum. 3/8 oz big enough for 2-3 mn. with a TD?...Its all I got.
Last edited by OhBee on Thu Dec 17, 2020 3:03 pm; edited 1 time in total
OhBee- Platinum Member
- Posts : 698
Join date : 2016-03-23
Age : 73
Location : Minnesota
Re: Engine mount
OhBee wrote:There is some space between the engine and the beams. Was thinking about a couple of thin hardwood strips epoxied in to take up the space
I would do it, if only to just not have to think about it.
dirk gently- Gold Member
- Posts : 429
Join date : 2012-02-03
Age : 41
Location : Poznań
Re: Engine mount
I see "wallhanger" in it's future!
OhBee- Platinum Member
- Posts : 698
Join date : 2016-03-23
Age : 73
Location : Minnesota
Re: Engine mount
C'mon OB I want to see this fly..you do not hang a crispy TeeDee049 on the wall..
balogh- Top Poster
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Posts : 4747
Join date : 2011-11-06
Age : 65
Location : Budapest Hungary
Re: Engine mount
[quote="balogh"]C'mon OB I want to see this fly..you do not hang a crispy TeeDee049 on the wall.. [/quote
Well,thats better than in a box ! ...Isn't it? For a "simple" kit, this whole thing has been a pain! Making do with what I can scrounge is getting tiresome. Not to mention the long lost skill set.
Well,thats better than in a box ! ...Isn't it? For a "simple" kit, this whole thing has been a pain! Making do with what I can scrounge is getting tiresome. Not to mention the long lost skill set.
OhBee- Platinum Member
- Posts : 698
Join date : 2016-03-23
Age : 73
Location : Minnesota
Re: Engine mount
Shim it a little large both sides, sand/file down carefully to fit. Epoxy in. Touch up with your paint which looks very good. What is it?
Good luck.
Bob
Good luck.
Bob
rsv1cox- Top Poster
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Posts : 10557
Join date : 2014-08-18
Location : West Virginia
Re: Engine mount
Bob...the paint is Rustoleum ultracover...Key Lime. Over a white primer..topped wth 2 coats of Krylon satin polyurethane. At least this time everything was compatible! Unlike the fiasco I had painting the Wido Satan.
OhBee- Platinum Member
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Join date : 2016-03-23
Age : 73
Location : Minnesota
Re: Engine mount
re read Ken Cooks advice then re read it again....
There is plenty of meat for the small nut plates...more than 80% will be backed to wood...the dinky part in open air can be ignored or filed flush
The opening NOT touching the sides of the crankcase under the mounting lugs is irrelevant and preferable so you can float the engine while establishing up or down thrust
Use two steel, aluminum, or plastic 3/32" or 1/8" shim plates under each lug. This will move the engine out board a bit to better be in line with fuel tank center....these shims can be flat or slight angle to give in/out thrust...home made or Brodak/ Lee Machine shop
There is plenty of meat for the small nut plates...more than 80% will be backed to wood...the dinky part in open air can be ignored or filed flush
The opening NOT touching the sides of the crankcase under the mounting lugs is irrelevant and preferable so you can float the engine while establishing up or down thrust
Use two steel, aluminum, or plastic 3/32" or 1/8" shim plates under each lug. This will move the engine out board a bit to better be in line with fuel tank center....these shims can be flat or slight angle to give in/out thrust...home made or Brodak/ Lee Machine shop
fredvon4- Top Poster
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Posts : 4001
Join date : 2011-08-26
Age : 68
Location : Lampasas Texas
Re: Engine mount
Hey Fred!...thanks for the tips!.....recognize that engine?
OhBee- Platinum Member
- Posts : 698
Join date : 2016-03-23
Age : 73
Location : Minnesota
Re: Engine mount
What Fred said ^^
getback- Top Poster
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Posts : 10119
Join date : 2013-01-18
Age : 66
Location : julian , NC
Re: Engine mount
Yes I do...sort of looks like the bottom of one of the many TeeDee engines I sent around the world to folks
I too want to see this plane twist you around until you wonder if it is EVER gonna run out of fuel
The giggle and grin is worth the pain of making it AND flying it
I too want to see this plane twist you around until you wonder if it is EVER gonna run out of fuel
The giggle and grin is worth the pain of making it AND flying it
fredvon4- Top Poster
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Posts : 4001
Join date : 2011-08-26
Age : 68
Location : Lampasas Texas
Re: Engine mount
Fred...what size fuel tank will run this 2-3 min?...I doubt I could spin around much longer than that!
OhBee- Platinum Member
- Posts : 698
Join date : 2016-03-23
Age : 73
Location : Minnesota
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