new prop for .21 mono

[ahab2]

Hi everybody I'm 16 and built a 23'' mono this winter originaly intended for brushless electric I then changed my mind and put an os .21 in it. :D I chose the 21 because i wanted to make shure I had enough power and i could always build a biger hull if it was to much I also instaled speedmaster hardware and a mac tuned pipe, dual 4oz. tanks itweighs about 3lbs ohh And is 8.5'' wide and now for the :confused:

wich prop do you guys think would give me good performance?

right now im useing x642 seems to go prety fast abot thirty i think I also tried x437/3 and it went alittle slower and the engine reved a litle higher

wich prop(s) should I try/buy next?
should i go higher or lower or in between the two that i have?
Also it dosent seem to be geting on the pipe what shoud i do?

this building an drivig is realy got me hooked. :cool:

Filip

[BoatDoc]

that's a lot of engine for a 23" boat! i'm surprised it stayed on the water!my .21 mono runs a prather 215, or an octura x437. but it's a 31" outboard, so i don't know if those props will work well for you or not.

[ahab2]

Thanks I'll check them out just for the heck of it might work :)

[Hydro Junkie]

The reason your boat went slower is you went to a smaller prop with less pitch. You went from a 42mm prop with a 67mm pitch to a 37mm prop with a 51mm pitch. In a perfect world, your boat with the 437 will go forward 16mm less for each full turn of the prop than with the 642. As for what prop to try next, can't help you there as I don't have that boat.
As for the tuned pipe question, go into the RCBM section of this site. In the June 2004 issue, there is an article about tuned pipes and how to set them up. Your pipe could be either too long or too short. Read the article and see if it helps :)

[ahab2]

Yep looks like i have to cut it shorter thanks, Hydro Junkie! So do think I could go higher with the prop?

[Watercadet]

I know that most of the fast A mono guys are spinning x440/3 maybe a little pitched up. You need to let that motor rev up. The OS is a great motor but not quite on plane with CMB and MACs in terms of hp, they may get away with a x442...

[ahab2]

thnx for the replies

i was thinking of what would work good for lubing the flex saft i dont favor greace cuase its alitle thick waht do you guys use

[Watercadet]

People I race with make a remote oil reservior that is connected to the stuffing box. before they run just fill up the 1oz. or less tank with 50wt and it oils it self.

[ahab2]

thanks i think that is a prety :cool: trick :)

[Ron Olson]

Props somewhere between an X437 and an X440/3. You'll have to experiment to see what the boat and motor like. My .21 mono can run a Prather 220 or the new Octura M445 with no sweat but it's a high HP motor. MAC motors are better off with smaller props. John Brown runs an X437 on his Microburst.
For flex cable lube, I've used a lot of stuff from bearing grease, Prather and Hughey grease to a 50/50 mix of STP and 20w50 racing oil.
For an oil reservior, I've seen just a piece of brass tubing soldered to the stuffing box to "boost bottles" from small nitro motors to old R/C car shocks. Some Gas boat racers even have pressure fed grease fittings set up from a small fuel tank.

[ahab2]

whats the "m" stand for on the m445 and is there any clearcoat that is nitro proof and compatable with car paint? and is the x642 to big do you think?

[Ron Olson]

The "M" stands for Modified. Right now Octura has only a few of the "M" series props, another is an M447 that was made for 7.5 outboards. They are basically an "X" series prop with a little of the tongue removed.
Yes, I think that the X642 may be too much for the O.S..
For a clearcoat, I saw that some are using a Sherwin-Williams paint that seems to be compatable.

[bufferoo]

Ron,

A question for you...any idea on what would be a good substitue for lubing the cable\shaft that's environment friendly? I am working on a pressure fed oil system but I don't want to just be squirting oil and other petroleum prodults out the stuffing tube and into the water. I'm thinking of mineral oil but I'm not sure how well it would work.

Any thought? I really don't like the idea of making the water dirtier than it is right now. Besides, this is just one more reason for people to complain about running the boats in the first place. If I can fix this issue then I may be able to get a pond back.

Bufferoo

[BoatDoc]

bufferoo, i may be able to help. i do a lot of environmental and chemical work. most oils are non-regulated until they reach HUGE volumes. basically this means that it actually takes a lot of oil before they have any affect on the environment. i'm talking thousands and thousands of gallons! however, i haven't run upon many that are "environmentally friendly" so to say. what about natural castor oil? if i remember correctly it's non poisonous, and non flammable and all that good stuff. there are also some types of grease that are able to degrade quickly so that they break down into a safe substance. and remember this, an outboard bass boat puts out more pollution in one minute than most r/c boats put out in a week! hope i helped.

[bugfanatic]

Yep, I've heard of castor oil or try olive oil.

[ahab2]

Hey Ron, do you know the spesific paint #/name of the clear coat? I have a Sherwin-Williams store just in the next town down the highway. Im gald there is some hope in finding that kind of clearcoat.


If I build a cat for the .21 thats on my mono how big should i make it, Width, length, Depth of tunel, width of tunel ? I realy want a catamaran
What doyou hink ".21cat" :D

[ahab2]

hellooooooo :(

how bout if i make it out of 1/16'' plywood and put a laer of fiberglass onthe outside would that work or is it beter on the inside :confused:any suggestions onthe size? :confused:

[Hydro Junkie]

If you want a Cat, with that .21, I would look in the 28 to 30 inch range in length, with a width of 8 to 10 inches. You have to remember that the area between the sponsons will be about one third of the width of the boat, so the boat will be wider than a mono, like you have now. As for fiberglassing a wooden hull, that's strictly your choise. I have never seen anyone with a wooden hulled hydro put fiberglass on them due to the weight it would add. I also have never seen a wooden hull fail, if properly built. Others may have other opinions, so check them all out and decide from there. :)

[ahab2]

OK thanks maybe i wont be so bored this winter. how about hardware?

[ahab2]

anyone???hardware recomendations wich would work best I probably wont be on a budget so anything goes.

[BoatDoc]

aeromarine makes some pretty good hardware. they also provide a lot of different options for setup.

[ahab2]

how do i pst pics? :confused:

[BoatDoc]

click on the "post reply" button. when that comes up look at the button that says "manage attachments". i've found that .jpg's are easier to post than .bmp files. they are smaller and fit within the size limit easier. after that, it's pretty much self explanatory.

[Chris LaPanse]

23", 3lbs, OS.21, i'm surprised it went only 30's. My friend races .21 shallow vees, and they hit mabye 53-55mph, and they weigh about the same as this, maybe a little more.

[ahab2]

Ican upload the foto alright but how does it apear on the post?magic? or am I doing some thing wrong? :o

[Ron Olson]

do not use the "Quick Reply", use the "Advanced". Scroll down and use the "Manage Attachments". When you hit that, another screen will pop up allowing you to browse you computer to find the pic that you want to post. When you find that, there is a button that you hit to upload the shot.

[ahab2]

Ok i think I did it Igess It dosent show it on the preview :D :D :)

[ahab2]

Here it hits a smaaaal wave this was top speed during the begining of break-in :D

[ahab2]

One happy boater

[ahab2]

what do you guys think?

[Hydro Junkie]

I think you need some kind of prop guard before you loose a finger while running on the beach

[ahab2]

Prop gaurd :confused:

[Ron Olson]

All of my boat stands have a prop guard on them and I have widened the base for more stability when transporting them. I make them slightly wider than the hull. Another tip when making a stand is to have some ground clearance under the boat but not too much. If you start them on dirt, the prop will kick up sand.
I'll have to post a pic of one of my PVC stands.

[ahab2]

OOOOOOHHHH on the stand :o yeah Il do that

I have another ? My engine dosent idle slow enough to let the boat realy setle down so I either have to kill the ingine Or catch it while it's going like 10 mph :eek: when i am brining it in for some fuel Is there any thing that could do?

[Ron Olson]

Yes there is. Usually 2 things at least. #1 is check the idle set screw (the one by the carb throat). Some times these are set so it won't allow the carb to close fully when you push back on the trigger. #2 is to check the throttle trim on the transmitter. Other things like the throttle linkage being too long can do it too.
The best way for me to set up everything is to put the trims in the neutral position with the radio on with the throttle fully squeezed and shut off the reciever. The carb should be at full open when you do this. If not, adjust the linkage so that it is. Turn the RX back on then adjust the trim so that you barely have a gap in the carb for starting.

[FlyerCAN]

Nice boat!! And look at all that water. Must get a little rough some times. Maybe you should think of moving up to a larger gas boat (http://www3.ns.sympatico.ca/h/hellen.pilgrim/) for those windy days and rougher waters. :D :D

[ahab2]

I probably would but they are Quite expensive to start out I took me a whole summer to save enough to build this boat around $700 :D My last boat I got for my birthday It was a GP Wave rocket it was fun But soon I needed some thing faster :rolleyes: so I built this one The resson its such a smal hull is becase i built it for a brushless system And relized I could have a nitro for the same price But i could also be on the lake for a whole day :) This is the firs paint now i have yellow and thiscolor chekers new beter looking top and blue spikes coming from the front as soon as I fix my camera Il post the after picture.

[Chris LaPanse]

An Enforcer Super G is only about 750 less radio equipment. It will do 42mph all day, and, at 46" long, can handle rough water very well. Also, because it runs on pump gas, fuel is really cheap, and it runs reliably.

[FlyerCAN]

but even cheaper if you can find one on ebay. :D

[ahab2]

Huum that sounds nice. maybe I ould just build a biger hull then my rough water problem solved cause once it gets some speed, any chop, and it starts to get out of shape.

[ahab2]

Ok Get ready foooooor Loww quality fotos well its just because I haven Got a program for down sizing :D

[ahab2]

Number 2

[ahab2]

Nuuuuuuumber 3

[ahab2]

Ok last One maybe :D

[Hydro Junkie]

Good looking paint job. I have two questions for you, however. Did you put any floatation in the front of your boat and did you ever put a prop guard on your stand? Would hate to see you loose a boat you worked so hard on due to lack of floatatiion and a finger from hitting a spinning prop :(

[ahab2]

Yep Got flotation At first i tried he expanding type almost tore the front apart so i resorted to shreding and packing some regular foam in the entire bow.THen I shaped a sheet of balsa and glued it in to hold the foam in Where the second row of chekers end is where the foam starts ya think its enough to hold it on he surface? about the prop gaurd not yet but its on the way.

If you notice the resin on the turn fin side I hit some thing ful speed almost fliped the boat :eek: and ripped the bootom screw holding the fin out. I kinda reffered to the article in the latest issue of rcbm to repair it Now it seems indestructible, Atleast until I hit something ellse. :D Im thinking this thing goes at least 40 :cool: I have digital camera for a while so Il try to get a video

WHERE CAN I POST A VIDEO. RCFLIX MAYBE :confused:

How about a name for the boat any sugs.

[FlyerCAN]

ya rcflix!! Have a few there myself.

[Ron Olson]

Me too!
I'll have to see the video to get an idea for a name.

[ahab2]

Here is the begining of the construction of the prop gaurd

I have no clue of how its suposed to be so :o

[ahab2]

Let me see some of yours So I can copy them :D

[Doubledog]

Where have I been on this thread?

Sweet boat! Fantastic setup. Very clean indeed.

Get a few more of those action shots for us.

[ahab2]

Yeah I was going to steel my brothers camera today but he caught me Otherwise Id Have a load of fotos and videos.

I ran it today and it seems to like 25% fuel beter than 30 But its Hela fast like not even touching the water most of the time. Il try later this week to get some shots.

[ahab2]

today may be the day guys going to the lake later. taking the veeeery expensive camera too.hope it dosent start raning or winding:) Cause in minesota One hour its raning the next its like nothing ever hapened. Wish me luck.

[ahab2]

Wel went to the lake today but was tooooo chopy :eek: to get speed.got a video but make shure you dont think thats the full speed cause after fliping it three times I was going slow not to flp it again. thats abot half the speed.

Yasterday i made a video but it was too dark to see any thing So Ill have to wait for another day to gat a god shot.

By the way how do i post videos in rcflix?
And the x 642 makes the boat go faster so Ill stik with it instead of the X 437/3. The ingene dosent seem to be to loaded either. :)

[FlyerCAN]

you log in and up in the right corner but not all the way up is the word "upload photos"
click it

[Ron Olson]

Upper right-hand corner in the tool bar where it says "Upload Photos".

[ahab2]

THanks guys Its on the web now seems to bee working. and Il try to Make one where the boat is going full speed :) But this is all for now :)

[ahab2]

doooh I just remembered whuy i kept fliping to make that vid
trimtabs were not bent down :(

Anyways
I'll get a beter one maybe this week
heh I'll remember nextime :rolleyes:

[ahab2]

what do you think of it.

you did look at it right?

[ahab2]

Ineed a mufler for the boat one from some factory i made my own but it dosnt look so hot any suggs. on where i could get one

[ahab2]

Got some pics and a video check it out Still to chopy though. :( chek out how far the roostertail is landing

[ahab2]

one more.

[ahab2]

one more.

[ahab2]

hello again heres more.

[ahab2]

Stupid weeds. :mad:

[ahab2]

:mad: :mad: weeds :mad: :mad:

[Doubledog]

More

More

More

!!!!!!!!!!!!!!!

[ahab2]

Yay nomore weeds :) For the video check RCFLIX.COM Ihave to wachuot for the rooster when I launch or else i get soaked :D

[ahab2]

Before the camera was ajusted :D
stil a cool pic though :)

[ahab2]

done for the day

[ahab2]

EVIL WEEDS bent my favorite prop :mad:

[ahab2]

Sorry the video isnt uploded yet it take no less than an hour so Itl be there tomorow.

What do you think ishould do with the prop Bend it back or cut of the leading ege/modify

Still loking for a mufler and a name for it. :(

[ahab2]

Okay its on the site just look in recent posts at the bottom

[ahab2]

Thanks for the rating FlyerCAN. Has anybodyelse seen the videos of that nameles boat i have?

[ahab2]

any body??????? :(
How do I mod the prop? does any body know of some kind of facttory made silencer for this size of engine.

the boat seems to purpoise while turning whats going on? :confused:
any coments are welcome :D seem like ime the only one posting on this thread :(

[Ron Olson]

Your roostertail is telling you that the prop is too high out of the water, that's why you are getting the porpoising in the corners.
I don't think that weeds bent your prop unless it was thinned too much. More than likely you hit a twig or larger floating out there.
Prather makes a silencer.

[Watercadet]

On the prop I say bend it back a little and remove a little. Cuting the toung will give you a little more top end and if you were having a problem planing already that will be amplified with out the toung.

[ahab2]

About how much of the toung? And what should I use for cuting it? Inever moded props before. And I dont even have a quality balancer, but Il probly get one soon. Wich one is the most acurate?

[ahab2]

Yes the weeds did not bend the prop there was alot of chunks in the water too thats why in the 2nd vid I slowed down when i past the boeys. i realy need to find a good lake.

[ahab2]

Soooooo what balancer is the best and hoqw canI order from prather?

[Ron Olson]

If your local Hobby Shop can't get things from Prather, go to a web site that handles Prather. Try www.funrcboats.com .
What balance is the best? How much money do you want to spend? You can get them as cheap as $20.00 or dump upwards of $100.00 or more for a jeweled balancer. I just have an old Robart that I picked up at a swap meet.
I wouldn't get into any fancy prop work yet until you get the basics down.

[ahab2]

iM PRETTY SURE OF WHAT IM DOING BUT I DO NEED A BALANCER SO IT CAN GUIDE ME ON THE BALANCING PART OTHERWISE IF I SCREW UP IVE GOT AN EXTRA PROP IN THE DRAWR. ABOT 80 DOLARS IS FINE FOR THE SPENDING. i WANTTO INVEST ONLY ONE TIME. OOOOH I JUST REMEMBERED I HAVE A MIL SITING ON MY WORKBENCH WHAT DO YOU GUYS THINK MILL ONE OR BUY ONE THE SHAFT WOULD PROBABLY BE MY ONLY PROBLEM

[ahab2]

ok ill buy one and mil a kopy