Quantcast

Sheet Metal Engine Mount?

HomeBuiltAirplanes.com

Help Support HomeBuiltAirplanes.com:

Tiger Tim

Well-Known Member
Joined
Apr 26, 2013
Messages
3,299
Location
Thunder Bay
I’m curious, is there any precedent for a sheet metal engine mount? What I’m picturing is a semi-monocoque fuselage that just keeps going past the firewall and instead of being strengthened to take the attachment loads for a steel engine mount, it carries the engine directly instead. Yes, there would need to be some means of access to the engine’s accessories and surely it would need doublers and whatnot as you get closer to where the engine bolts are.

Has it been done before, especially on a light plane? I’m not looking to copy anyone’s work here but a little inspiration is never a bad thing.
 

TFF

Well-Known Member
Joined
Apr 28, 2010
Messages
13,430
Location
Memphis, TN
I have never worked on one, but in a certain way is the Bonanza partially like this?
 

Tiger Tim

Well-Known Member
Joined
Apr 26, 2013
Messages
3,299
Location
Thunder Bay
Well that’s nifty how the Bonanza has the engine cradle tied in to the nose gear keel.
1593223288734.jpeg

How about examples where the engine is radially mounted by the back of the case, like a small Continental, or a VW, or any number of radials?
 

Chilton

Well-Known Member
Joined
Jun 28, 2014
Messages
127
Location
Jersey, channel islands
I have never seen the cone type, but the Cessna 206 and 210 use a sheet metal bed mount very similar to the bonanza, it is one o the problems with the Thielert conversion which was planned as the bed mount had to be cut off.
 

Victor Bravo

Well-Known Member
Joined
Jul 30, 2014
Messages
7,737
Location
KWHP, Los Angeles CA, USA
The NAvion also had a similar sheet metal/rivet engine mount, which also handled the nose gear pibot if I recall.

Several of the small designs on the "Motorcycle of the Air", "21st Century Volksplane", and "Piojo" discussion threads have an engine mount that is nothing more than an extension of the fuselage structure. This looks like it works extremely well with the little V-twin industrial engines, which have lower crankcase mounting holes.
 

rv7charlie

Well-Known Member
Joined
Nov 17, 2014
Messages
838
Location
Jackson
In the homebuilt world, the Questair Venture has a sheet metal bed mount for the IO550G engine. Never seen it done for a small Contenental/Lyc rear mount, though. My best guess for a reason is access to accessories. If you box in the back of the engine....

Charlie
 

Mad MAC

Well-Known Member
Joined
Dec 9, 2004
Messages
649
Location
Hamilton New Zealand
I can't remember (mosquito maybe) what but some WWII aircraft with a RR merlin had a riveted engine mount initially (riveted tube & folded rivet sheet).

The extended fuse approach does make changing the engine make or model a bit more difficult.
 

Bigshu

Well-Known Member
HBA Supporter
Joined
Jun 7, 2020
Messages
140
Hummel aircraft typically use a bed mount incorporated as part of the fuselage. Some builders go ahead and use a steel mount instead, but both 1/2 VW and full VW are supported in the Hummel designs.
 

12notes

Well-Known Member
Lifetime Supporter
Log Member
Joined
Aug 27, 2014
Messages
1,085
Location
Louisville, KY
Hummel aircraft typically use a bed mount incorporated as part of the fuselage. Some builders go ahead and use a steel mount instead, but both 1/2 VW and full VW are supported in the Hummel designs.
The bed mount is only for the 1/2 VW in the Ultracruiser, both the Hummelbird (1/2 VW) and H5 (full VW) have a conventional 4130 engine mount with no bed mount option.

I think the Ultracruiser bed mount is aluminum angle bolted to engine, which is bolted to aluminum angle side rails of the fuselage, but I may be mistaken.

EDIT: Sorry, I was wrong about the H5, it is a bed mount.
 
Last edited:

Billrsv4

Well-Known Member
Joined
Sep 29, 2016
Messages
134
Location
NW Oregon
I’m curious, is there any precedent for a sheet metal engine mount? What I’m picturing is a semi-monocoque fuselage that just keeps going past the firewall and instead of being strengthened to take the attachment loads for a steel engine mount, it carries the engine directly instead. Yes, there would need to be some means of access to the engine’s accessories and surely it would need doublers and whatnot as you get closer to where the engine bolts are.

Has it been done before, especially on a light plane? I’m not looking to copy anyone’s work here but a little inspiration is never a bad thing.
Tim, I didn’t check all the replies but there was a well known vintage aircraft with a sheet metal bed mount. The P51 Mustang had one. Don’t remember which version. I believe there were tubular versions also. The Questare Venture also used a oilpan/sheet Metal mount. So yes it certainly can be done.
T.O. Bill
 

Bigshu

Well-Known Member
HBA Supporter
Joined
Jun 7, 2020
Messages
140
The bed mount is only for the 1/2 VW in the Ultracruiser, both the Hummelbird (1/2 VW) and H5 (full VW) have a conventional 4130 engine mount with no bed mount option.

I think the Ultracruiser bed mount is aluminum angle bolted to engine, which is bolted to aluminum angle side rails of the fuselage, but I may be mistaken.
Well, my H5 plan set from 2008, on sheet 2 clearly details the engine box (bed mount) for the full size VW engine. Another well known Hummel builder who's local to me, did use a welded mount, but the built in bed mount is clearly what Hummel has in mind for the H5.
 
Top