Twin engine thrust balance problem... | FerrariChat
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Twin engine thrust balance problem...

Discussion in 'Aviation Chat' started by troy_wood, Mar 7, 2011.

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  1. troy_wood

    troy_wood Formula 3

    Apr 28, 2007
    1,457
    Nova Scotia, Canada
    Full Name:
    Troy Wood
    #1 troy_wood, Mar 7, 2011
    ...on a RC airplane :)

    I'm getting my DC-3 out this spring and am prepping/psyching myself to fly it again after only 2 previous flights (one successful and the other not). The dak is an 7' wingspan with flaps, retracts, alerons, rudder, elevator and independent throttle control.

    Here's the problem. While I can get engine rpm synced at the low and high range, they accelerate at different rates. Takeoff is very hairy becuse of this imbalance. While I have given up on trying to balance engine acceleration I was hoping to get some takeoff tips to compinsate for this engine problem.

    Thanks.
     
  2. Blue@Heart

    Blue@Heart F1 Rookie

    Jun 20, 2006
    3,889
    Yellowknife, NWT
    Full Name:
    David
    #2 Blue@Heart, Mar 7, 2011
    Gas? or electric motors?
     
  3. troy_wood

    troy_wood Formula 3

    Apr 28, 2007
    1,457
    Nova Scotia, Canada
    Full Name:
    Troy Wood
    #3 troy_wood, Mar 7, 2011
    Saito 4-stroke gas.
     
  4. solofast

    solofast Formula 3

    Oct 8, 2007
    1,773
    Indianapolis
    #4 solofast, Mar 7, 2011
    You need some way to let the motors get to full rpm before you release it. Think about a latch that hooks the tail until you can get to full power and the motors are making equal rpm's and then let it go. Once you have full power the airflow over the tail surfaces should allow you to control it as soon as it gets rolling.
     
  5. 430man

    430man Formula Junior

    Jan 18, 2011
    489
    #5 430man, Mar 7, 2011
    Last edited: Mar 7, 2011
    For ~$70 you can buy an Engine Synchronizer. Money WELL spent.

    They have master and slave versions and independent versions which I like better. google is your friend for current models.

    EDIT: a couple of google searches tells me they might be a few bucks higher than I remembered.
     
  6. troy_wood

    troy_wood Formula 3

    Apr 28, 2007
    1,457
    Nova Scotia, Canada
    Full Name:
    Troy Wood
    #6 troy_wood, Mar 7, 2011
    Had no idea these were an rc option for twins. Sounds like my option.

    Thanks for the responses. I'll let you know how I make out.
     
  7. Tcar

    Tcar F1 Rookie

    Jan 2, 2010
    4,739
    Denver, Albuquerque
    #7 Tcar, Mar 16, 2011
    Last edited: Mar 16, 2011
    There's a 4 engine RC B-29 that I've seen videos of that has engine sync. Video shows taxi, take-off, etc.

    Much larger, must be a 10' span at least.

    Couldn't find it right now... I'll keep looking...



    Friend also said that someone's done a huge RC B-36, but I haven't seen or heard anything else about that.
     

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