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Kyosho MP777 Submarine!

Old 06-01-2005, 04:04 PM
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Crazy Canuck
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Default Kyosho MP777 Submarine!

Hey all,

Well today was a real kick the *****! Was out at the local bash spot runnin my almost new MP777 SP1 when all of a sudden it just takes off WOT (yes I have a failsafe but for some reason it did not work????) and goes flying towards this lake. It hits the bank and goes flying a good 30 feet out and down about 15 feet into the water where it promptly sinks!!!! I'm running like a bat out of hell just to keep up, when I get to the edge and look down, I see the Kyosho in about 4 feet of water sitting on the bottom. I was sad....Luckily I got to it in time, dragged the little water logged drowning victim out and proceeded to drain her of water. Again luckily no water got into the receiver or battery housing...most water drained out of the pipe but the tank was full of H20, let it all dry out for a few hours and she started right back up again good as new. Upon further inspection, it appears that one of the double A batteries came loose and when I pinned it, the battery popped out and the throttle stuck wide open. The failsafe should have kicked in but didn't so I watched helplessly as $2000 went screaming towards it's demise. All is well now and I'm happy to say no ill effects came from it's swimming lesson...a lesson for me though...make sure everything works properly before running my machine!

Cheers
Old 06-01-2005, 04:20 PM
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UF DUB
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Default RE: Kyosho MP777 Submarine!

if your battery pops loose, no failsafe will save you. it only works at low voltage, not no voltage. from your description, you need a 5-cell rechargable battery pack (somethign with over 1400mah). double A's will let u down again soon if u arent careful. its happened to me.
Old 06-01-2005, 04:50 PM
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SN VipeR
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Default RE: Kyosho MP777 Submarine!

2000$ worth of equipment and not enough money to buy a decent battery pack?

Those AA holders are a common cause for such runaways. Bear in mind that they might even fail you when a servo draws too much current out of the batteries leading the often too thin springs that hold the batteries to melt. I don't know why manufacturers keep supplying those model car deathraps with their radios!

But even with a battery pack, you might still lose power for some reason. A failsafe doesn't help at loss of power. The only thing that helps is a strong rubber band around the carb that closes it when the servo loses power. This also replaces the flimsy spring on the throttle linkage. For that you need a throttle servo with smooth gears though, such as a Futaba metal geared servo or a Hitec with carbonite gears. Hitec metal gears have too much resistance to allow for the rubber band to move them.
Old 06-01-2005, 06:23 PM
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JustinWZP
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Default RE: Kyosho MP777 Submarine!

VipeR called it.............a $.01 rubber band would have saved the day. Just buy a bag of them and try a few out to find the best fit. Get a digital JR and you will be VERY protected......those servos have nearly no resistance when they have no power.
Old 06-01-2005, 10:56 PM
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Crazy Canuck
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Default RE: Kyosho MP777 Submarine!

Thanks for the rubber band idea, I'll give it a go...I have a Hitec steering servo in right now so I may pop in one of my digital servo's. Gettin a hump pack tomorrow, no excuse for why I was using the Double A pack...learned that one the hard way. As for the failsafe, never even crossed my mind that if a batt fell out I would be up the creek...hahaha no pun intended!

Cheers
Old 06-02-2005, 01:25 AM
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Foxy
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Default RE: Kyosho MP777 Submarine!

Failsafes....pish. I've heard so many horror stories about failsafes going wrong (although I admit that in this case, there is no excuse for you still to be using the AA batt pack), and even destroying expensive servos, or not kicking in when they are supposed to, and I've NEVER had a runaway, in many many years of RCing (am I just lucky?), so I don't bother with 'em. I know I'm not the only one on here who is of this opinion as well...they can give a false sense of security, when all you need is comprehensive checklist before you run and well maintained equipment...just get a spektrum system as soon as you can afford it, i will be...
Old 06-02-2005, 05:42 AM
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Michaelthefirst
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Default RE: Kyosho MP777 Submarine!

the only time i had a runaway was when i had the radio off put the throttle servo to full primed it then forgot to turn the receiver on and started the engine, zoom wot down through a bunch of trees off a wall down through a parking lot and hit the curb at the bottom which killed the engine, to my surprise i only bent two screws in the diff housing. moral of the stroy- dont get very stoned then try to run your car.

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