REFLECTOR: Franklin Alternator

Tue Nov 10 12:22:46 CST 2009

Mike,

Our planes must be pretty close.  I weigh 180# and if I do a W&B with 75# at the co-pilot position my CG is 119.8.  I fly solo with no weight added up front and am still within the CG envelope.  This puts me close to the aft CG but not beyond.  The advantage is that I get reduced ground roll on take-off.

My battery is an Optima spiral cell, 65 Amp/hr, 45 pound monster (CG helper).  It too spins the prop real lively.

Larry Coen
N136LC

From: Michael Watson 
Sent: Tuesday, November 10, 2009 10:22 AM
To: Velocity Aircraft Owners and Builders list 
Subject: Re: REFLECTOR: Franklin Alternator

Larry,

I'm really not that close. Flying alone, and with 75 lbs. in three leather bags of
shotgun lead (25 lbs each) under the co-pilot seat, my cg is 119.5. My airframe
was built very light, the problem is the weight of the Franklin engine and accessories
back there. It's a good thing that the IVO prop is very light.

Yesterday, I replaced my concord battery with a Odyssey PC 1200 mj so that
added 4 lbs to the arm at 28 inches. The Odyssey spun the engine so fast I 
thought it was idling.

On Mon, Nov 9, 2009 at 10:33 PM, Laurence Coen <lwcoen at hotmail.com> wrote:

  Mike,

  I ran a W&B and 4# at the alternator arm moved the CG 0.1" aft.  If you're that close don't ever fly naked.

  Larry Coen
  N136LC

  From: Michael Watson 
  Sent: Monday, November 09, 2009 2:30 PM
  To: Velocity Aircraft Owners and Builders list 
  Subject: Re: REFLECTOR: Franklin Alternator

  Thanks John,

  I got an 70 amp Mitsubishi alternator out of a late model Honda, it fits perfectly but it's 4 lbs
  heaver than the one have. My CG is too far aft as it is, I hate to add more weight back there.
  Was looking for a lighter alternative.

  BTW: a couple of years ago, I remember you made a post asking if you reduced
  the space between the top of your arm pit scoop and the wing from 1 inch to 1/2
  inch, if it would pump more air into the plenum.

  Did you reduce the area and did it reduce your CHT's ???

  On Mon, Nov 9, 2009 at 2:51 PM, <aminetech at bluefrog.com> wrote:

    Mike,

    Mine is belt driven.  Seems like it shouldn't be hard to find one that fits.

    John 

    --- mikewatsspg at gmail.com wrote:

    From: Michael Watson <mikewatsspg at gmail.com>

    To: Reflector <reflector at tvbf.org>
    Subject: REFLECTOR: Franklin Alternator
    Date: Mon, 9 Nov 2009 14:36:37 -0500 

    Posted this before but go no replies, thought I'd post again.

    My engine was purchased from Atlas Motors and came with a 35A
    alternator. Now that I have installed dual GRT HX EFIS, the little
    alternator is just not up to the task. 

    B&C Dose not make an alternator to fit the Franklin. 
    Which alternator are you Franklin drivers using.

    PS. 60 ~ 70 Amps. 

    -- 
    Mike W.
    1997 Velocity Elite RG
    Franklin /IVO Electric CS
    Dual GRT EFIS HX Synthetic Vision

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  -- 
  Mike W.
  1997 Velocity Elite RG
  Franklin /IVO Electric CS
  Dual GRT EFIS HX Synthetic Vision

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-- 
Mike W.
1997 Velocity Elite RG
Franklin /IVO Electric CS
Dual GRT EFIS HX Synthetic Vision

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