Sideways engine?

[Dean Pappas]

True, the plane should be balanced in both first and second moments. That means dynamically and statically balanced. If you need to do this, then estimate the uncentered weight and how far it is from the model's centerline. In the case of a side-mounted 160, it's probably only 5 or 6 ounces, centered about 3-1/2"from the CL. So put all the servos and battery against the left wall of the fuse, and take any remainder out with a tiny bit of tip weight. Oh yeah, the snaps are one place I would not expect to feel the dynamic imbalance effect. I would expect to feel it in the transitions from positive to negative "G", like a figure eight, or in hard square corners.
It's not that bad ...
Dean P.

	-----Original Message----- 
	From: David Lockhart [mailto:DaveL322 at comcast.net] 
	Sent: Thu 1/15/2004 10:52 AM 
	To: discussion at nsrca.org 
	Cc: 
	Subject: Re: Sideways engine?
	
	

	I think Nat (the Aerodynamic Voodoo Guru, <G>) has pointed out the the issue
	we care about most - dynamic balance.
	
	FWIW - I keep very close track of wing and stab weights when building and
	all my wing/stab panels are generally within a gram or two.  I haven't
	statically balanced (other than CG) or added tip weight to one of my models
	in the past 15 years and haven't found a need to do so.
	
	Regards,
	
	Dave Lockhart
	DaveL322 at comcast.net
	
	----- Original Message -----
	From: Nat Penton
	To: discussion at nsrca.org
	Sent: Wednesday, January 14, 2004 10:02 PM
	Subject: Re: Sideways engine?
	
	
	If lateral balance is attained with assymetric weight distribution then the
	plane would be dynamically unbalanced, that is there would be assymetric
	forces during accelerated roll . I suppose this might be noticeable with
	significant assymetric weight distribution, but probably not with what we
	are talking about. Mike Nauman where are you ?
	----- Original Message -----
	From: Jeff Hughes
	To: discussion at nsrca.org
	Sent: Tuesday, January 13, 2004 10:03 PM
	Subject: Re: Sideways engine?
	
	
	I flew an Arch Nemisis with a st2300 at the 7:30 location and you couldn't
	tell any difference. As long as the plane is balanced lateraly it really
	doesn't know where the cylinder head is.
	
	----- Original Message -----
	From: Woodward James R Civ 412 TW/DRP
	To: discussion at nsrca.org
	Sent: Tuesday, January 13, 2004 12:22 PM
	Subject: RE: Sideways engine?
	
	
	I think Ron Ellis flew Sam Turners first Saturn with the ST2300 positioned
	at the 07:30 spot, and original muffler down the center.
	Jim W.
	
	-----Original Message-----
	From: John Ferrell [mailto:johnferrell at earthlink.net]
	Sent: Tuesday, January 13, 2004 11:19 AM
	To: discussion at nsrca.org
	Subject: Re: Sideways engine?
	
	That makes sense to me. I am really surprised that the question did not get
	a bigger response though.
	I am way too lazy to conduct any testing on my own. I probably lack the
	skill necessary to discern the difference any way.
	
	John Ferrell
	6241 Phillippi Rd
	Julian NC 27283
	Phone: (336)685-9606
	johnferrell at earthlink.net
	http://DixieNC.US
	NSRCA 479 AMA 4190  W8CCW
	"My Competition is Not My Enemy"
	----- Original Message -----
	From: george kennie
	To: discussion at nsrca.org
	Sent: Tuesday, January 13, 2004 1:30 PM
	Subject: Re: Sideways engine?
	
	John,
	I'm not sure if I'm right on this, but I think that I would like to have all
	that Mass(bulk & weight of the engine head) located on the centerline of the
	aircraft.I think that all that off-center mass could produce some unexpected
	and unwanted effects during snap type maneuvers(and probably others) where
	radical changes in aircraft speed differentials might magnify the off-center
	forces in a detrimental way causing exagerated pitch and roll responces
	making control during certain maneuvers difficult to compensate for. I don't
	have any empirical data to back any of this up, but it just doesn't feel
	right to me.
	Georgie
	John Ferrell wrote:
	From Eric's recent post on another topic:Mounts his engine sideways> Uses a
	more regular header etc.I have forgotten what the advantages are to inverted
	engine mounting. Like the matter of retracts which seems to have become a
	personal choice, I wonder if it really matters to the flying
	characteristics. An engine on its side is more tolerant of flooding, easier
	the plumb the exhaust, easier to connect/disconnect the glow plug. I expect
	that it would spin & snap differently depending on direction, but that seems
	to be the norm with the engine inverted too.  John Ferrell
	6241 Phillippi Rd
	Julian NC 27283
	Phone: (336)685-9606
	johnferrell at earthlink.net
	http://DixieNC.US
	NSRCA 479 AMA 4190  W8CCW
	"My Competition is Not My Enemy"
	
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