REFLECTOR: Fw: M/T Electric Prop

[Ron Brown]

Jim,

When I read your note about the low rpms at initial roll, I thought this didn't agree with Dean's electric M/T on his IO 360.  Perhaps you can adjust your prop to give more like 2700 rpm and 200 hp on your initial roll which should much improve your take off distance.

Ronnie

----- Original Message ----- 
From: Unterreiner 
To: Ron Brown 
Sent: Monday, March 24, 2008 6:01 PM
Subject: Re: M/T Electric Prop


It actually goes to about 2750. The adjustment nut is at it's limit so it over speeds a bit. My limit rod needs to be changed so it can be adjusted properly, this is why it over speed when I lost the governor. Jim should be able to set it so it will go to 2700 early in the takeoff roll and then it should adjust the blades as you pick up speed and stay at 2700.
  ----- Original Message ----- 
  From: Ron Brown 
  To: Dean Unterreiner 
  Sent: Monday, March 24, 2008 4:28 PM
  Subject: M/T Electric Prop


  Dean,

  Doesn't your M/T go to 2700 rpms on initial full power or does yours lag like Jim's? 

  It would seem that the take off run would be much shorter if the engine was making 2700 rpm at the beginning of the roll.

  Ronnie 


  ----- Original Message ----- 
  From: Jim & Sharon Beck 
  To: Velocity Aircraft Owners and Builders list 
  Sent: Monday, March 24, 2008 1:12 AM
  Subject: Re: REFLECTOR: VG for naca scoop.


  Al. 
  I break ground at 85 MPH and the Rpm Runs right up to 2550 when I add full throttle and then keeps moving right up to 2700 at about 65 mph. Acceleration seems pretty good up to 60 mph and then seems to slow getting up to 85. I can lift it off before 85 but will settle back in and run a bit longer on the wheels. 
  thanks 
  Jim

    ----- Original Message ----- 
    From: Al Gietzen 
    To: 'Velocity Aircraft Owners and Builders list' 
    Sent: Thursday, March 20, 2008 7:09 AM
    Subject: Re: REFLECTOR: VG for naca scoop.


    Jim;  

    Could this be more an issue of thrust than lift?  At what speed do you 'break ground'?  What is your static rpm? What rpm do you see during takeoff roll?



    -----Original Message-----
    From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Jim & Sharon Beck
    Sent: Wednesday, March 19, 2008 9:57 PM
    To: Velocity Aircraft Owners and Builders list
    Subject: Re: REFLECTOR: VG for naca scoop.



    Thanks for all your good information on the VGs placement and other good ideas. I've been working on shortening my takeoff roll on my 173 Elite RG with 200 hp Lyc and MT electric prop. 2 people & 40gal fuel take me about 2700 ft to break ground at our 4000 ft elevation here in the winter at 50 degree temps and fully loaded in the summer much longer. So far I've added the lower winglets and gained about 300 ft on takeoff roll and just put 6 pr of vg on the outboard main wings, about 1/2 of the full recommended set. Hope to test that when the wind quits blowing and then will possible ad the full set on the main wings. may skip the canard or just put a few on as I don't have trouble rotating, just getting the main wing to leave the ground. will try your suggestions on the oil cooler and also a naca for back seat ventilation that doesn't seem to have much air coming through.

    Thanks again

    Jim





----------------------------------------------------------------------------


    _______________________________________________
    To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector

    Visit the gallery!  www.tvbf.org/gallery
    user:pw = tvbf:jamaicangoose
    Check new archives: www.tvbf.org/pipermail
    Check old archives: http://www.tvbf.org/archives/velocity/maillist.html


------------------------------------------------------------------------------


  _______________________________________________
  To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector

  Visit the gallery!  www.tvbf.org/gallery
  user:pw = tvbf:jamaicangoose
  Check new archives: www.tvbf.org/pipermail
  Check old archives: http://www.tvbf.org/archives/velocity/maillist.html 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.tvbf.org/mailman/private/reflector/attachments/20080324/8628e244/attachment-0001.htm