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Date: Sun, 09 Feb 2014 09:53:27 -0600
From: Charlie England <ceengland7@gmail.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Fwd: Fwf weight
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I wish I'd weighed my O-320 Lyc installation when I had it off the -4 
for a top overhaul, but it just didn't occur to me at the time.

The firewall portion of my mount (without the gear legs) weighs 15 lbs, 
so that makes 325 lbs plus any added weight for the muffler. I might be 
able to offset most of the muffler weight by building a stainless 
manifold; the stock portion on the engine weighs 9.3 lbs. The radiator & 
duct weighs 8.7 lbs, with just over a pound for its mounting brackets. I 
forgot to separately weigh the oil cooler/duct/mount, but it's not 
light. The engine mount adapters are massively over built, but the 
combined weight of all three plus the 'V' that ties the top mount to the 
main mount is just over 7 lbs.

I remember you thinking that your installation could have been lighter 
without the stainless coolant lines. I suppose I shouldn't be too 
disappointed with this weight, but I had this vague hope of coming in 
under 300 lbs. Doesn't seem possible unless much lighter heat exchangers 
are available. Anyone manage to hit the 300 mark (without the firewall 
portion of the mount, of course)?

Charlie

On 2/9/2014 6:31 AM, Ed Anderson wrote:
> Charlie, my FWF installation weighed in a 340 lbs that included 
> everything including the motor mount (did not include prop).  Included 
> Engine, Gear box, starter, two radiators, oil cooler, ducting, exhaust 
> header (no muffler) and intake manifold.  It also include a bunch of 
> heavy -16 stainless steel braid radiator hoses and smaller oil and 
> fuel lines (all SS braid) and their heavy fittings.  It also include 
> my small header tank and oil/air separator (since removed).
>
> Ed
>
>
> -----Original Message----- From: Charlie England
> Sent: Saturday, February 08, 2014 11:12 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Fwd: Fwf weight
>
> Anyone else weigh their installation? I'd like to know how this compares.
>
> This is dry weight, including all the mount adapter hardware that isn't
> attached to the firewall, Richard's OMP adapter & OMP, intake manifold
> (not including the sheet aluminum cover for the plenum), both heat
> exchangers/diffusers, almost all the engine plumbing, and the 'core' of
> the stock exhaust manifold (fairly heavy). It does not include a muffler
> (6 lbs for the Aeroturbine AT2525) or the associated stainless tubing. I
> even threw on a couple of plastic reservoirs to account for coolant &
> 2stroke oil tanks. To be realistic, I'll probably need to add another
> 10-15 lbs, minimum.
>
> Charlie