Miss Bud 1/12 - strange thing!

[Eytan1958]

I have a few modes which the boat is running.
1. All OK, boat is running in high speed.
2. I give throttle, the engine raises rpm the prop is spinning but the boat moves very slowly.
3. The boat is running nicely, I lower speed to say 20% throtle, then raise to 80% and again like in mode 2... the engine is screeming and the boat does not move fast (more like waliking speed)

If it was a car I would say that the clutch is slipping.....

Any advise?????????????

:confused: :confused: :confused:

[550racer]

sounds like the prop is cavatating when u put it in the water make sure its at high speed to keep it on plain

[Eytan1958]

550racer..Don't understand your point...can you explain..

[Doubledog]

Cavitation can be a killer.

Try coming up with the throttle a little easier. Another suggestion is to go with a slightly larger prop. What size was that again??? ... Almost positive it was a "Y" series.

[550racer]

yes what prop is it? the stock one? or upgraded? i ment when u throw it in the water make sure its reving high that way it takes right off in the water and stays on plain

[Doubledog]

Sounds like he's on plane running good and then stabbing the throttle. When that happens the prop is loosing bite.

I'll stick to my gun and say increase a little easier. Should solve your problem, but check out that 'Y' series prop. Do a quick search for it here.

[Eytan1958]

Hi All

I am running the standard Y534 (just ordered the Y535).

Please use "simple English".......
Cavatating.....
Plain......

[550racer]

id do what doubledog said was accelerate slowly and not puch the trigger..

[RCGUY76]

stupid question....check the set screws on the drive dog and make sure they are locked in place and the shaft isn't spinning..

.when you launch the boat...make sure you give it a good flat toss....to get it up on plane..apply about 3/4 throtle when the boat hits the water always keeps mine up on plane....if you spin out and loose plane and the boat drops back flat in the water....lets it idle for a few seconds until the back wash catches up with the back of the boat...when you see the wave getting close to the back of the hull..give it more throtle and it should get back up on plane and flying down the lake...try to avoid running high throttle if the boat isn't moving....if its not moving, there's no water cooling and the engine heats up real quick.....goodluck

[Doubledog]

Originally posted by Eytan1958


Please use "simple English".......
Cavatating.....
Plain......

Plane;)

[lovinnitro]

Do they pay you to be here Dog?:D

Here you go on the defintions:

Cavitation: is water vaporizing due to the extreme reduction of pressure on the back of the propeller blade. Many props partially cavitate during normal operation, but excessive cavitation can result in damage to the prop's blade surface. Note: Cavitation is often confused with Ventilation.
Basically the prop is spinning and water is not complately surrounding it acting almost like a slipping clutch.

plane: is when you have the boat up to speed the least amount of area possible on the boat is in the water.

Hope this helps a little

[460_f100_dude]

i think you are getting cavitation, but you can minimize that by rolling slowly onto the throttle instead of just gassing it like you would w/ a car, most boats are like this and take some good throtle control to run them and unlike a car you dont have brakes so let off the throttle slowly before a turn unless of course your boat can handle a wide open throttle turn. but a bigger prop on the miss bud is a must that and make sure before you throw it in not to have the motor screamin like a cat have it so there is soem lag from when you gas it to it actually starts to rev up this will help it not to die from the shock of the engine being under a load in the water plus it makes it easier for you not to have to roll on the the throttle quite so gently to keep on plane, hope this helps

[Eytan1958]

Thanks guys..
You are great......:)
Will try it next weekend ...

[Doubledog]

Hope it works out for you

[hydroracer]

Originally posted by RCGUY76
stupid question....check the set screws on the drive dog and make sure they are locked in place and the shaft isn't spinning..



good point RCGUY.

i'm not familiar with the lil miss bud, but if you plan to upgrade to a metal prop like the Y535, make sure you sharpen and balance it properly first. this is very important and new boaters may not be aware of that. the BC metal props from octura , especially the smaller ones, are pretty rough brand new out of the bag and need to be cleaned up before you run them or you'll surely have performance problems. if you go plastic, it's not necessary as far as i know. bent, dinged, or damaged props can cavitate too. i'm not sure if that boat's strut is adjustable or not, but check and make sure the prop "depth" is set as per the instructions.

give it a good level toss when you launch it. when on plane, it will skip on the surface like a skipping-stone. once up, it should not drop back off plane unless you slow it back down to much. good luck, and ask away if need be. :)

[lbobbitt513]

ya i had that problem, one it lost plane it would not have speed to plane off again.

[Eytan1958]

Well my boat was upgraded a little..

I now have a metal prop (Y535) and also I have installed the autobailer and some red light on top of the boat in order to see it at twilight time.

The boat is going much better than before but still have a few moment when the boat is coming out of plane.

Question: If I will add some weight to the back side of the boat will it be more easy to stay on plane?:)

[Austinlake]

I've had numerous occasions when either of my Ms Buds would appear to be cavitating or even worse yet, sitting still in the water. The main culprit was the loose set screw on the flywheel drive dog. Be sure that it is tight and has lock-tite on it or it will eventually vibrate loose.

[Jas131]

If you weight down the back, let us know how it works out. I have done all the things you have done and still have the cavitation problem. It has just become an issue of feathering the throttle when it starts to cavitate. Maybe the weight will help.

[Doubledog]

Eytan ! -~ Things still going good?

You know what I'm thinking is maybe someone should start a thread with the basic upgrades done to this boat. Keep it simple... ie,

Loctite the setscrews on the drive shaft
Install new pushrod boots

etc....

[mjmsprt40]

I can't answer for the cavitation, as the monos I've run never seemed to suffer from it. Set screws are another matter, and way back in the days when I was running a SK'Daddle I had no end of problems with loose set screws in the drive dog. I might get one good run out of it, then the next run it would come loose, the engine would scream and the boat would sit there. Using 20/20 hindsight, I see now that the problem was that I was running unbalanced props. The vibration this set up would have been enough to loosen anything that hadn't been welded in place. Since then, I've learned to balance metal props, and in the size engines I favor never use plastic. A little bit of red Loctite settles the issue quite nicely. I have 4 boats, some in construction and some that run, and haven't suffered a loose set screw in years.

[Jas131]

Anyone consider converting one to an electric boat. These things seem to be consistantly flawed with problems.

[bugfanatic]

Yeah, a brushless would make it scream with the right setup.

[Jas131]

SERIOUSLY, Im considering switching mine to an electric set up. What is needed. I want this boat to fly. What kind of costs are involved and how long a run time do these get?

[Doubledog]

http://www.rumrunnerracing.com/feforums/

[bugfanatic]

There are a lot of great electric setups out there. And these guys will help you a lot - but if you wanna go fast. I mean FAST, then you have to make the jump to brushless. Either contact Randy Naylor at BBYracing.com (he holds a few electric titles) & he can set you up, or try Hacker Brushless @ http://www.hackerbrushless.com & they can give you all the help you need.