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Thread: 70cc twin exhaust

  1. #131
    Senior Member Satellite's Avatar
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    Re: 70cc twin exhaust

    Quote Originally Posted by -Rick- View Post
    I did by guessing at the distances of what Jim was asking for. Going out today and will take a tape measure with me. Three meters is just under ten feet so will try again. I will try it at twenty five feet as well. I don't know if I am getting some prop ripping as well, I do not know what prop ripping sound like. Never heard a plane ripping a prop. Will a wood 24x10 rip on the ground at 7300 rpm?


    Hi Rick

    I don't think you will hear a prop rip on the ground , only in the air flying . Mine rips in the air at WOT ( 6900 - 7000 RPM ) with a 25/8W Falcon Carbon Prop . You will know what it sounds like when you hear it

    Ray

  2. #132
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    Re: 70cc twin exhaust

    yupper mine also rips the 25/8 wide falcon in the sky.

  3. #133
    Senior Member -Rick-'s Avatar
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    Re: 70cc twin exhaust

    86 db from both left and right. 88 behind. Could not check in front, field was busy.

  4. #134
    Senior Member rpm's Avatar
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    Re: 70cc twin exhaust

    Thanks Rick! Very similar numbers to what mine was on 2-into-1 header and MTW 110 canister.
    Humber Valley RC Flyers

  5. #135
    Senior Member -Rick-'s Avatar
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    Re: 70cc twin exhaust

    Quote Originally Posted by rpm View Post
    Thanks Rick! Very similar numbers to what mine was on 2-into-1 header and MTW 110 canister.
    I know the db numbers don't lie but everyone at the club as well as myself do find it quieter than other 50,60,70cc motors. It must be the tone of the exhaust.

    I do believe that it rips at times just not badly. I can make it at full throttle so I can hear the prop biting. You tube vid's that I have watched don't do prop ripping justice so I can not get the full sound of it.

    I live a sheltered life for never hearing prop rip in person!! I did try to make it to huckfest this year, maybe I would have heard it there! (My wife has been very ill for the last five months, so did not make it to any events that I wanted to go to this year.)

  6. #136
    Senior Member -Rick-'s Avatar
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    Re: 70cc twin exhaust

    Ray, the DA 70 has been a perfect motor for me. Runs like a bull!! When a guy gets 600 more rpm with exactly the same prop I had on a EME 60 you know we have a winner!! (and I really believe is has more rpm in it!!)

    (ya Jack, I'm still watching the telemetry to much. Should work on it with only the tach.)

  7. #137
    Senior Member Satellite's Avatar
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    Re: 70cc twin exhaust

    Quote Originally Posted by -Rick- View Post
    Ray, the DA 70 has been a perfect motor for me. Runs like a bull!! When a guy gets 600 more rpm with exactly the same prop I had on a EME 60 you know we have a winner!! (and I really believe is has more rpm in it!!)

    (ya Jack, I'm still watching the telemetry to much. Should work on it with only the tach.)


    You can't go wrong with the DA-70's Rick , one heck of a motor , also the service that stands behind them with DA

    Ray

  8. #138
    Senior Member -Rick-'s Avatar
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    Re: 70cc twin exhaust

    Quote Originally Posted by Satellite View Post
    You can't go wrong with the DA-70's Rick , one heck of a motor , also the service that stands behind them with DA

    Ray
    I am really happy with it!

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