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Thread: Footy build log

  1. #1

    Default Footy build log

    This is VOYAGER my first RC sailboat so its not the best.

    I don't have a scale but it all ready sits on the water line and I don't have the receiver or battery in it yet.

    I currently had no hobbies so I started to build a footy razor.

    Here are some pics plz tell me what you think ty.
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    Last edited by qwerty2008; 03-13-2010 at 10:35 PM. Reason: I forgot to put the name

  2. #2

    Default Re: Footy build log

    Sorry I forgot the older pics here they are.
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  3. #3

    Default Re: Footy build log

    Here are some pics of VOYAGER in my measurement box
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  4. #4

    Default Re: Footy build log

    Here are some pics and a video I took of voyager in the water. It already sits at the bottom of the transom so its a bit heavy but its not going to be a racer so who cares.
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  5. #5

    Default Re: Footy build log

    i ordered the tx/rx system it should be here in 3 to 4 days

  6. #6

    Default Re: Footy build log

    Welcome to 'the hobby'!
    Looks good. Interesting to see a winch in a footy.
    The biggest difference in weight can be made in the batteries.
    Consider a small cell phone battery.
    Rusty
    George Little: Maybe we should go home.
    Mr. Little: Why?
    George Little: I'm not wearing my lucky underwear.
    Mr. Little: You don't have lucky underwear.
    George Little: Well, maybe we should get some, and then come back for another race.

  7. #7

    Default Re: Footy build log

    How would i wire that ?

    thank you

  8. #8

    Default Re: Footy build log

    all the cell phone batteries i could find were 3.6 or 3.7 volts my setup takes 4.8 to 6.0 volts

  9. #9

    Default Re: Footy build log

    Most AM and FM receivers and servos will run well on 3.6volts.
    The light weight aircraft guys used to run on 3 cell nicads for years.
    A fully charged LiPo or LiIon cell is over 4 volts and discharges down to about 3volts before it needs to be shut off to prevent damage.

    I suggested a small cell phone battery because they are readily available, as to are the chargers, cheap (surplus), and have a built in protection circuit to shut them down before fully discharged.
    On a small footy with a balanced rig in moderate conditions, you should budget on 100mAHr drain, so a small battery should last most of the day.
    They do not appreciably self-discharge, have no memory effect on recharge, and are incredibly light.
    The one I have in my DLG glider weighs 3.6gm and will power the FM receiver and two analogue servos for an hour and a half!

    The LiIon in my footy with a McRig I got from a surplus electronics store for $1 and is 19gms (heavy) metal encapsulated, delivers 450mAHr. It has no protection circuitry so I just have to remember to charge it every second time I go sailing and its ok. They are supposed to have a shelf life, so be conservative with older stock.

    The lower voltage may slow the servos slightly and give a little less torque, so size the sail servo accordingly. A McRig does not need much anyway. The lower voltage also increases the battery time because of lower current draw too. Unlikely to be any range problems from the receiver.

    Attached is a photo of the footy power wiring. The loom is attached to a socket for the receiver scrounged from a common old computer lead, and a switch jack (switched power socket) sourced from an electronics supplies outlet and takes a common charger power plug. The cell is charged and monitored through this plug. Monitoring of the cell voltage is done with a 50 ohm resistor loaded volt meter that mimics a loaded cell. This may be prudent if using a small 'racing' pack on a windy day. The circuit is isolated by inserting the plug. A short rubber plug or tape covers the socket when sailing. When making one you may need a multi meter to verify the function of the socket lands - one side of the switch goes to the charger circuit and the other to the receiver. They are available ready wired from DLG glider outlets eg, http://olgol.com/TabooGT/form.html.

    If your system by some quirk requires more voltage, then this cheap circuit will boost to 5volts: http://www.hobbycity.com/hobbycity/s...ooster_for_BEC
    If you run an old (heavy!) AM receiver, many of these have a BEC circuit which will allow you to run 2 LiPo batteries in series (2S pack), the circuit will reduce the voltage to 5v for the receiver and servos by wasting it as heat!
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    Rusty
    George Little: Maybe we should go home.
    Mr. Little: Why?
    George Little: I'm not wearing my lucky underwear.
    Mr. Little: You don't have lucky underwear.
    George Little: Well, maybe we should get some, and then come back for another race.

  10. #10

    Default Re: Footy build log

    I have a nicad double/triple A battery charger that charges four at a time that's what I was planing to charge it with and run it off four double A batteries.
    this boat is not going to be a racer mainly because it is my first and I did not do very well but also because I live in California U.S.A. and there are no rc sailing groups near me.

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