News:


  • June 22, 2025, 01:07:21 PM

Login with username, password and session length

« previous next »
Pages: [1]   Go Down

Author Topic: Dumb Q's  (Read 1107 times)

steven yampolsky

  • Guest
  • Trade Count: (0)
Dumb Q's
« on: July 02, 2007, 07:22:47 AM »
I have a couple of dumb Q's:

1) How much fuel should I put through a brand new PA61 on the test stand before it's ready to go into a model? 1/2 gal, 1 gal?
2) How much fuel does a typical does a PA51/61/65 use for a pattern?
Logged

Online Bill Hummel

  • 25 supporter
  • Trade Count: (0)
  • Captain
  • *
  • Posts: 410
Re: Dumb Q's
« Reply #1 on: July 02, 2007, 09:48:43 AM »
Hi, Steve,

   On my PA engines, I try to run them 1.5-2 hours on the bench, short runs, varying speeds.  Both seemed to become "friendlier" at about the 1 hour mark.  Outstanding engines!  The PA 61 side exhaust is using about 6 ounces for a pattern, with comfortable time after.  Noel's PA 65 side exhaust, as I recall, is using a little more...maybe 6.5 ounces or so.  With Randy's guidance, we are running these a little below the "pipe style" run, with very good success!  Great 4/2/4, super power. Using the newer Pro Zinger 13/4 and 13/5 props is working well.
Logged
ama 72090

Offline Bradley Walker

  • Trade Count: (0)
  • Admiral
  • ******
  • Posts: 1192
    • The Urban Rifleman
Re: Dumb Q's
« Reply #2 on: July 02, 2007, 11:32:24 AM »
Bill,

Could you please tell me what kind of tank you are using and what is the tank shim height?
Logged
"The reasonable man adapts himself to his environment. The unreasonable man adapts his environment to himself, therefore all progress is made by unreasonable men."
-George Bernard Shaw

Online Bill Hummel

  • 25 supporter
  • Trade Count: (0)
  • Captain
  • *
  • Posts: 410
Re: Dumb Q's
« Reply #3 on: July 02, 2007, 04:18:03 PM »
Hi, Brad,
   I'm using either Brodak or GRW 6 oz uniflow/all tubes forward, no muffler pressure. Tank shim is about 1/8" off mounts, same as the engine pads.  Might go another 1/32" if I get motivated...
Logged
ama 72090

Offline Doug Moon

  • 25 supporter
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 2310
Re: Dumb Q's
« Reply #4 on: July 03, 2007, 10:16:09 PM »
I usually run about a gallon on the bench.  4 to 8 oz at a time.  Yeah it is excessive but you have to go through it.  Then it will take about another 20-30 flights to "cycle" in and it should really start to smooth out and get very easy to needle and run on a day to day basis.
Logged
Doug Moon
AMA 496454
Dougmoon12@yahoo.com

Offline L0U CRANE

  • AMA Member
  • Trade Count: (0)
  • Admiral
  • *
  • Posts: 1076
Re: Dumb Q's
« Reply #5 on: July 05, 2007, 06:11:16 PM »
Steve,

You got good solid answers.

My only quibble is your thread title: The ONLY dumb Q's are the ones you SHOULD have asked, but didn't...  ;)
Logged
\BEST\LOU

Advertise Here
Pages: [1]   Go Up
« previous next »
Tags: