Today's Message Index:
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1. 03:02 AM - Re: Engine Through-Stud Sheer... (W J R HAMILTON)
2. 10:19 AM - Re: Random thoughts on Merlyn Products conversions (Jim Addington)
Message 1
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| Subject: | Re: Engine Through-Stud Sheer... |
Folks,
Is an STC really necessary, has anybody explored a field upgrade.
I say this, because several upgrades with which I have been involved
in Australian (not AC) have been done on our (near) equivalent of a
377 field approval system, with the appropriate CAR 35 (DER) input.
As a simplification, it is assumed that the extra power will be a
"bonus", there was no attempt to re-certify any increased performance.
This has avoided the need to re-determine Vmc figures etc., if the
upgrade is a twin.
I know it all sound a bit rough and ready, but there is little
involved in putting the IO-520 in the 500A, I doubt that the IO-550
is much more of a bother, with a co-operative FAA man.
Needless to say, one would be wise to have some carefully established
"informal guidelines", if in fact you just happened to be
"inadvertently" taking advantage of the additional HP, and one quit.
Fortunately the wonderful engine out handling of Aero Commanders in
general make this somewhat less fraught than some other
manufacturer's products that started with IO-470, but have acquired
IO-520 along the way.
Cheers,
Bill Hamilton
At 03:24 AM 15/08/2007, you wrote:
>Good idea about the 550... A guy in the hangar here has a Bonanza
>with one and he loves it... I guess put out a call for all 12 of
>the existing 500A owners left to see what interest might be shown ;)
>
>
>David Owens
>Aerial Viewpoint
>N14AV
>AC-500A-Colemill
Message 2
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| Subject: | Re: Random thoughts on Merlyn Products conversions |
What happened to F. Lee Baily's 500B project where he was putting on the
TIO-540s?
Jim Addington
500A
----- Original Message -----
From: "John Vormbaum" <john@vormbaum.com>
Sent: Saturday, August 18, 2007 2:00 PM
Subject: Commander-List: Random thoughts on Merlyn Products conversions
>
> Merlyn products makes some great conversions. There are a couple being
> flown around here, including a 320-hp converted 500B and one of the
> original 350-hp 500B's with the 4-blade props. I've flown in both, and e
> was putting have PIC time in the 4-blade version. The 4-blade makes a very
> different sound than my stock 500B (of course, the props spin at 2,700 on
> takeoff, I think) and its efficiency really doesn't shine until you're up
> in the teens. The 320hp conversion feels like a stock 500B, except you can
> make 48" of MP on takeoff, like the 350hp. Being a low-compression engine,
> it also doesn't really show you what it's got until you're up over
> 10,000'.
>
> I think I might prefer the Merlyn 300hp conversion, which is a
> turbonormalized application (like my rayjays) on the IO-540-M1C5
> (wide-deck) engines. This would give me most of the zip of the 320hp up
> high, but between 3,500 - 10,000, where I do most of my "local" flying, I
> wouldn't suffer any of the inefficiencies (think fuel consumption) that
> the boosted engines would. Plus, I still would get a gross weight
> increase.
>
> Hugh @ Merlyn really knows what he's doing. His single-turbo/mechanical
> wastegate is far, far better than the rayjay setup that I have in my
> airplane. You just push the throttle levers to the MP you want, whenever
> you want it. It also has a very nice blow-off valve to prevent you from
> overboosting the engine. All this in a package that is MUCH simpler than
> the rayjays it replaces; there's tons of room in the aft nacelle to still
> get at accessories & oil filters, unlike in my airplane with all the
> rayjay plumbing in the way.
>
> At some point I'm sure I'll buy one of Hugh's STC's for my airplane,
> although, with fuel the way it is, I'd like to see a diesel (jet-A) option
> for our airplanes. Maybe the Century 4.0 engine might be a potential
> retrofit, although I've heard that neither Century nor Twin Commander have
> expressed *any* interest whatsoever in supporting an STC effort...
>
> /J
>
> nico css wrote:
>> <nico@cybersuperstore.com>
>>
>> Mike,
>> I visited Merlyn's website and found many interesting things, which
>> answered
>> some of my questions. I am going to contact these folks for more
>> information
>> and permission to publish some of their material on our website.
>> It appears as if these STC's are existing and flying mods. Perhaps if
>> Bilbo
>> had known about these, he could have had his 500A dressed up in one of
>> these.
>> Thanks for introducing me to them. Nico
>>
>>
>>
>> -----Original Message-----
>> From: owner-commander-list-server@matronics.com
>> [mailto:owner-commander-list-server@matronics.com] On Behalf Of mike
>> floyd
>> Sent: Friday, August 17, 2007 9:35 PM
>> To: commander-list@matronics.com
>> Subject: RE: Commander-List: 500A IO-550 Conversion
>>
>>
>> I do not know the answers to all of your questions but here is the
>> website I
>>
>> have found:
>>
>> http://www.merlynproducts.com/commander.html
>>
>> I am in Spokane right now and will find out on Monday what Merlyn is
>> doing.
>>
>> Mike
>> Northern Commanders LLC
>>
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