Notes to Self 3

[Tim Taylor]

That's the whole point in the story Ron, I ASSUMED I was right and didn't NEED to RTFB and could have screwed up big time. I've been flying JR radios for years but always a PCM10 of some sort, this 9303 is a new radio for me. What I did was get in a hurry, I wanted to fly and trim this airplane and didn't do what I should have done first. I hope my not so comical errors will help someone else from making the same mistake I did.
  ----- Original Message ----- 
  From: Ron Van Putte 
  To: discussion at nsrca.org 
  Sent: Wednesday, February 09, 2005 12:01 PM
  Subject: Re: Notes to Self 3



  On Feb 9, 2005, at 8:28 AM, Tim Taylor wrote:


    As our Continuing story unfolds........
     
    Timmy T is looking out of the shop door and sees that the weather is just perfect for some trim flights
     
    So we pack up the trailer and go for some trim flights. Recalling the last flights  all control throws too sensitive so I dial in less rates on low and put high rates to what low was before. Ok time to dial in some Expo on all surfaces, pop up the screen on the 9303 and dial in 30%. Ok time to fly. Airplane seems pretty stable now but the controls feel a bit "Twitchy" hmmm no problem continue the flight land and have a look. Ok maybe I didn't get enough expo dialed in so add some more. Next flight about the same but the controls seem a bit more "twicthy" hmmm something's not right here. Ok times up for flying for today pack up and head home. On the way home I get to thinking about the last flight and how the airplane changed the "feel" after I added the expo. Ok I get to wondering where the heck did I put the book for this new radio, Ok lets review the book on page A20 is the expo directions, it states "NOTE: Use only positive percentages unless there is a distinct need to do otherwise". Hmmmmmm that don't sound right! Turn the transmitter on and look at the expo I've got dialed into the radio, *&%^$*&#)(#&%^%)@(_*&_(^#  Everything is done to the NEGATIVE !!!!!! No damn wonder! So "Note to self" today's lesson is READ THE FRIGGIN BOOK !!!!!!!!!
     
    Ok while I'm at it lets program a little down elevator  trim at low idle, I wonder what page that is on in the book.................. "Fade to Black as Timmy T reaches for the book."


  My guess is that he's using a JR radio, because negative exponential is what you want on a Futaba transmitter to soften the control response. That's why well-meaning people at the field need to find out what brand of transmitter the guy being counseled has before telling him how to change the expo. 

  I had a similar situation when I was helping a novice trim out his airplane. After I flew a trim flight for him, I told him he needed 50 - 60% exponential on elevator and aileron. I asked him if he knew how to do that and he said that he did. The airplane was a handful on the subsequent flight, because he put in the wrong expo!

  Ron Van Putte

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