fixed gear vs. retracts

[John Ferrell]

As I recall the replacement gear (7075 aluminum)  was about 2 ounces lighter than the glass gear that came with my Focus. The original gear was 5.7 ounces. 

The failure mode was splitting at the attach point due to lots of landings in grass.

7075 is indeed difficult to work. I think the price for them at Piedmont is still $30. That seems high until you try to duplicate the process. 

Dick Hanson offered the suggestion when were first putting fixed gear on Prophecys. 

BTW, the popular home-built kit plane (Titan Tornado) uses 1-1/2" diameter 7075 rod as landing gear struts!

John Ferrell 
6241 Phillippi Rd
Julian NC 27283
Phone: (336)685-9606  
johnferrell at earthlink.net
Dixie Competition Products
NSRCA 479 AMA 4190  W8CCW
"My Competition is Not My Enemy"

  ----- Original Message ----- 
  From: Wayne Galligan 
  To: discussion at nsrca.org 
  Sent: Wednesday, July 16, 2003 11:13 AM
  Subject: fixed gear vs. retracts


     How light is light on the 7075 aluminum l.g. setup?   My setup with Bolly F3A large gear with wheel pants, axles and wheels weights 7.5 oz    I fly off grass and have had no problems with the setup where guys with retracts are constantly fiddleing and tweaking the struts.  The big plus(for me) is set-up.   Easier to build light wings, no linkages, one less servo, sets up in the field in no time flat.   As for tearing it up on hard landing.... just dont land in the tundra.  That is a plus for retracts if you have the gear up, otherwise retracts can tearup a good set of wings if stuck down or if one hangs up or colapses on landing on the runway.  Its a fliers choice.  I have fixed gear on 3 airplanes now and lovem all.  
  I personally like the looks of a nicely setup fixed gear airplane.   

  Wayne G
    ----- Original Message ----- 
    From: John Ferrell 
    To: discussion at nsrca.org 
    Sent: Wednesday, July 16, 2003 8:50 AM
    Subject: Re: Nats photos online


    From this site and personal experience:

    The change to fixed gear on the Prophecy seemed to require less power than those with retracts. 

    It seems to me that the weight is about the same.

    A harsh landing with retracts usually results in needing a little attention on the struts.
    The same landing with fixed gear frequently results in extensive damage to the fuselage.

    There is less bounce with retracts.
    Taxii out is not recomended with retracts.

    Retracts usually provide a wider footprint .

    The wire gear in the pictures on Pastorello's web site looks a little heavy but should be less punishing to the airframe than the fixed aluminum or composite gear.
    7075 Aluminum gear is lighter and more durable than any of the composite gear. Unfortunately, it is harder to work and not nearly as available as 6061.
    6061 aluminum for fixed gear is a waste of time.

    If landings were all scored K4, stif gear would go away...

    John Ferrell 
    6241 Phillippi Rd
    Julian NC 27283
    Phone: (336)685-9606  
    johnferrell at earthlink.net
    Dixie Competition Products
    NSRCA 479 AMA 4190  W8CCW
    "My Competition is Not My Enemy"

      ----- Original Message ----- 
      From: Mike Mueller 
      To: 'discussion at nsrca.org' 
      Sent: Wednesday, July 16, 2003 9:27 AM
      Subject: RE: Nats photos online


       I'm flying with my 1st fixed gear plane (Temptation) this year after many years of retract planes. It's all about taste in my opinion. It's also a fad to have fixed gear now. As far as looks I'll take retracts in the air. I still get a thrill out of sucking up the gears on takeoff. Wheels hanging out of my plane give me the constant feeling that my retracts aren't working while I'm flying. The fixed gears are stronger and allow you to taxi easier ans suppose to increase drag. Either way works well. Mike

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