scardina

My Feedback: (3)

okay im havin a debate in my head as to whether a .21 or a .46 boat would go faster. primarily in a rigger or tunnel. my thought is that with a .21, the parts are smaller and can run a lot higher nitro content and RPM's that a .46 wouldnt be able to handle. i've run 30% in my .46 rigger with speeds somewhere in the 50's. my tunnel has a .21, and is not tuned yet, but runs somewhere i'd guess in the mid to high 30's on 30%. ive seen most people running .21 engines run 40-60% and they seem to get very fast.

could a well tuned .21 beat a well tuned .46 because they can handle the higher nitro?

Sean Bowf

Well...since the D-hydro record is about 13 MPH faster than the B-hydro record...I would say that the .46 can/should be faster.

Sean

misshydro

A good.21 would kick a O.S.46 butt!!!! Like CMB,Nova,OPS and O.S.21 VZ turbo. Those.21 have2.5-2.8 hp and max rpms between 35.000-40.000rpms.I'm running my CMB.21RS Redhead on 33%nitro. runs great!!! Oh I'd heard the the O.S.46 crank case/block crack at the bottoms.[:'(] It realy depends on how big/long is your rigger?

Hydro Junkie

Too bad you are only looking at the OS .46 Misshydro, since the other .45's will walk away from almost any .21. The ability to swing a larger prop with more pitch can make a tremendous difference in both top end and acceleration. Considering most .45s can swing up to a 455 while a .21 can't hardly swing a 450 should tell you something

misshydro

If you read the heading HJ he was talking about.46!![:'(] You better get glasses....[X(]

scardina

My Feedback: (3)

the rigger is 32" long w/o the rudder. really shouldnt have to worry about cases cracking if you use a one piece mount, but i know that a lot of people do use the two piece mounts. im using K&B as it's what came in the rigger and i got a good deal on the outboard on my tunnel. oh and also, does anyone know the legality of using a variable tune pipe like the buku pipe in an IMPBA race? they claim to get more power out of a .21 and are mainly a car/truck thing, but i thought it would be kind of cool to use on a boat.

Sean Bowf

I thought we were talking classes of engines...not the actual size....pretty sure that is what the OP was talking about.

misshydro

32" that .21 would work in the riggers.I would go to INTLWATERS.com they have alot of riggers guys that races them. They can help you out better over there.They have a outrigger/hydro forum!![link]http://www.intlwaters.com/index.php?s=d0a059f6fdde46c86a1ac3a61de3a06a&act=idx[/link]

scardina

My Feedback: (3)

ok, im not personally looking for help on any of my current boats, the rigger runs good and the tunnel just needs to be leaned out or run on higher content fuel when i can get it. i was asking for opinions because my dad is looking at a number of different boats and some are .21, and some are .46. from what i have seen, a .21 can run very fast on high content fuel, and you shouldnt really run any higher than 40% in a .46. just trying to help him figure out what to get. he already has a K&B 7.5 in a mono, and a shockwave 36 (just for fun) and is looking to get something new, quite possibly to race with.

and yes, i am talking STRICTLY about displacement. a 3.5cc/.21 vs. a 7.5cc/.46

terry kelly

i do race riggers and i can tell you "none " of my 20 boats are 32 inches long, without the hardware, and a cmb 45 rs will crush a .21 anyday.

misshydro

he was talking about.46 you jack a**!!!!![>:] yes a.45 CMB would kick butts!!! Your another one that should get glasses!!![X(] Read the heading you moron!!![:@] Before you start jacking your jaws!!![>:]

scardina

My Feedback: (3)

my rigger has a .46 in it. the tunnel has a .21, and again, im not looking for help on my personal boats, they run so well i'm somewhat bored with them, lol.

my dad is looking at new boats and i was just wondering what the difference was speed wise considering a .46 cant run much higher than 40% whereas the .21 can run on 60%

terry kelly

glue some more wings on crooked you dumb *****.. no one likes you and no one really cares about your info.. which is usually very wrong.. so go play with your oberto..proboat...cmb .21 rs , on 33 percen and your the first to do the saltwater scoop and the first to ever put a .21 in a proboat chinese pos.. you go there retard..

misshydro

I'm not as stupied like you who got riped off by his buddy!!T***..for 800+[X(] You are such a dum a** it isnt funny!! It was funny when your buddy riped you off and you went crying all over the R/C boat websites about it!!! So who's the retard terry!![>:] So go play with your stupied vett/bath tub!![>:]

terry kelly

just thought id clear a few things up here you retarded deginerate.. you cannot spell, you are a horrible painter, you probably stink, you look like a crackhead, and probably are, i do not care how much money i lose, i have more, you are a mouthy w-h-o-r-e , and well i have been kicked off better places than this one, so if i get booted, well that is just the way it is, you are not welcome where the real boaters are , so stay here and enjoy the view...of my ass , biatch.

misshydro

Put your money where your big mouth is terry lets see who can paint!!!usless your a big chicken!!!!![X(][>:] Your flame job on that harley looks retarded!!!! Your the crack head who couldnt handle selling mac tools!!![X(][>:]

scardina

My Feedback: (3)

OK, change of subject in 3...2..1...

SO! Anyone know if that Buku pipe will work worth a crap on a boat? Also, anyone know if it would be IMPBA legal?

toyotatruckin

LOL sorry funny night

IMPBA legal is 92 DB or lower

scardina

My Feedback: (3)

yeah i know very well of that rule, i run at my local pond with the guy that helped introduce that as a rule so more places would let them run. but, the Buku pipe changes the volume of its internal chamber according to the pressure coming through it, thus changing the tune of the pipe while the engine is running, supposedly giving more power over the entire power band.

i wanted to find out if the pipe is legal because of what it does, i can work out noise with a muffler, afterall.

here's the link to their site explaining how it works http://www.bukupower.com/howitworks.html

ob nut

My Feedback: (1)

I'm running 65% in all my .45 tunnels.

Ron Olson

My Feedback: (1)

I always put things this way, if it was a good idea then it would have been used a long time ago by all of the major pipe makers. This one is nothing new as it has been done before. Whether or not there is any real benefit in it, I don't know. If they had shown a comparison against a regular tuned pipe with a marked improvement then I might be impressed.

scardina

My Feedback: (3)

they say you can try it for 30 days and if you dont like it, just send it back for a refund. i have been thinking though, i should just get a high end pipe, as in a boat you dont really use the low end, whereas the cars tend to change rpms a lot...

scardina

My Feedback: (3)

okay, looks like my dad is gonna buy a .21 rigger after talking to one of our local boat guys. it makes so much sense because if we both had a .45 rigger, we wouldnt be able to pit for eachother, lol!

TCHedOff

Jscardina: I was looking at some videos of some riggers. Check out this link:
http://3.csx.jp/spboatteam/Snoopy%20...sai/index.html
Scroll to the very bottom of the page, on the left side and click on p1050204 and p1050208; kind of [X(][X(][X(].

wave waker

as far as i know any muffler, tuned pipe is legal as long as not to exceed the 92 dB.

i have buku pipe, pics below is attached to cmb valvola(crappy engine)[>:],,i did testing this pipe but kinda pain to tune, in fairnest to it, i was not able to spend too much time testing, still in the process though.