miss bud 1/12 scale nitro boat

[rico3]

hi guys im new to this boat ... i live in england,ive just got my miss bud boat from funrcboats in usa.....3 question to ask... what nitro fuel should i use for my first run and what percent should the nitro be...should i grease the prop shalf straight away or should i grease it after 2 hours running in the owners manual... thanks :D :D :D

[martin richards]

The advice for glow engines was always run a couple of tanks of low nitro content fuel first with the needle set slightly rich. There ought to be more specific instructions with the manual. Then it should be run in. With regards to the prop shaft, some bushings need little lubricant (lead teflon in particular) but it never hurts to lightly grease, which helps to keep the innards dry. BTW the last glow engine I had was an Enya 19, so this advice is way outside its "best before date". ;)

[ElectRick]

Two important questions:

1) What type engine is it? ABC, ringed, or lapped piston? ABC engines should never be run rich, only rich enough at first to get a little smoke, but not so much as to be "4-stroking", i.e. slobbery rich. You will ruin the engine's piston-to-cylinder fit very quickly if you run it like that. If it's a ringed or lapped piston, it's best to run it fairly rich for 5 to 10 runs, then lean it out as normal.

2) What does the manufacturer recommend? If the engine has a high compression ratio, they may recommend low or zero nitro. If that's the case, putting high nitro (over 10%) will cause detonation, many blown glow plugs and overly sensitive needle setting. The detonation will destroy the engine sooner or later.
If you find that you are eating glow plugs, try either using 2 copper washers under the plug or going to a colder plug range.

Rick

[rico3]

cheers rick... its a dynamite.15s water- cooled engine ...the manual says use blue thunder..first run break-in fuel for the first 6 tanks of running then after that use blue thunder regular fuel or blue thunder race formula blend..but when i went to the local model shop he said just use a 10 % nitro fuel for the first couple of hours then go to 15% nitro and then 20%.. he says if ya wanna fast fuel blue thunder will do the job but your engine wont last long :rolleyes: :rolleyes: :rolleyes: :rolleyes:

[ElectRick]

I can't find any specific information on this engine, the Dynamite .15. Does the manual say whether it's of ABC construction?

It sounds like any regular fuel of 10%-25% would probably work OK in the engine. Just a general rule is that when the nitro goes up, the plug life (and to a lesser extent) engine life goes down. I used to run either 25% or 40% nitro in my racing boats years ago (depending on displacement), and blew a plug every two or three races on average. I have run up to 70% in a K&B 7.5 cc inboard, and while it was a ROCKET, it destroyed a plug every run. Unfortunately, it was too fast to be drivable in a heat race with other boats. Not to mention the expense of the fuel! :eek:

Main thing: Don't run the engine too lean, or too rich if it's ABC.

Rick

[rico3]

it doesnt say anthing about ABC... in the engine manual.... :p :p :p :p

[martin richards]

Is this the one?
http://www.funrcboats.com/StoreMBHnit.htm
If so you can probably increase the performance somewhat with a 35 mm "K" Graupner carbon prop, which is better than the plain plastic and much cheaper than the octura copper/beryllium and doesn't need the sharpening or polishing either.
Prestwich models is one of the best UK sources for i/c boats.
http://www.prestwich.ndirect.co.uk/
I notice the model in the link is set up to run counter clockwise. If your thinking of running it in competition, you should remember the model courses are clockwise, i.e. with the turn fin on the right sponsoon and the rudder to the left. If you are just using it for sport, the way as set up in the photo is more scale.

[rico3]

yeah thats the one...got it from funrcboats in usa.... but its set up to turn right so its ok ... :D :D :D :D

[rico3]

do these boats take a lot of water in? i read some where that there is a design fault with them...but was hoping that this bud niro was a more updated one since the boat has been out over 2 years now .... :eek: :eek:

[rjjr]

Rico3:

I just purchased a 1/12 miss bud and the problems certainly have not been solved. Water fills the boat and leaks into the electric box leaving the boat disabled. I would not run it without modifications.

I found a write up that seemed very helpful.

http://www.rchobbies.org/missbud_mods.htm

I'm in the porcess of doing the mods and will let you know how it goes.

[Ron Olson]

I might get my hand slapped but here it is. The Miss Bud is junk! Blue Thunder is one of the worst fuels to use. A lot of other Manufacturers say not to use their fuel in their products and will void their warranty.
Use the fuel that you plan on using all of the time on any nitro engine. The engine will get used to it.
Yes, the boats take in water, from the front to the "seals" around the linkage. The reciever switch is also exposed to the elements and will fry a lot!
Grease the shaft before every outing.
Big mistake that Newbies do with this boat. You have to launch the boat. Rev the motor up a little then give the boat a level toss parallel to the water just inches above it or else the prop will cavitate. Keep the speed up, this is not a slow down and speed up kind of boat.
Lotsa luck, you're gonna need it.
I hate to sound so negative but I keep hoping that ProBoat will one day come out with a good boat. So far it hasn't happened.

[rjjr]

Ron:


I know the boots leak and the switch is a problem but where is water coming in from the front?

I've been all over this thing and can't figure it out.

[Ron Olson]

It comes in under the cowling when water goes over the top of the boat. You can apply some radio box tape on the cowling before you start it then finish taping it down once the engine is fired.

[missbudrunner]

I found that if you put some thin double sided foam tape on the outside of the lip of the hull under the canopy it greatly reduces the intake of water into the hull, but remember, alot of water splashes up on the boat at low speeds so you're definately getting water in from the breather holes in the front of the canopy - also, the cheap plastic box cover needs to be replaced, it's nowhere near water proof, I used a thin guage sheet of aluminum that I found at a local hobby store and then i coated the inside of the switch that hangs under the cover w/ silicone - it works great just being taped to the inside of the hull....you probably want to switch out the push rod seals w/ some bru-line seals and put some epoxy on the inside of the receiver !!!! An auto bailer is a must too !!!!