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Speed freak needs help!!!

Old 02-03-2006, 04:34 AM
  #1  
matt407
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Default Speed freak needs help!!!


HI everyone,

I am new to rc nitro boats as i have only built model yachts up till now. I am a student up in liverpool (UK) and i want to build a speed boat that will do 50mph ++++ the only catch is i want to do it cheap....... I was looking at this outrigger to start with

http://welasercut.com/lasercart/inde...43095f73a5c4c1

then i was going to put a os .21 airoplane engine in it. as the marine engines are so expensive, the engine in an outrigger gets all the air it needs, For a little more protection i was going to tightly wrap copper pipe around the !QUOT!head!QUOT! of the engine and run water through it . I am not exactly sure whether this would work hence me asking you guys first. I have been told that a outrigger is the best boat for speed is this true?? I have miles of empty docks with Little more than a wind ripple at my disposal and now all i need is a boat..... am i going to have to bite the bullet and save for a rip off marine engine?? or is this crazy plan of mine going to work??

any help would be great ..

cheers Matt



Old 02-03-2006, 05:05 AM
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Matty_c
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Default RE: Speed freak needs help!!!

ok, matt for your idea on the copper pipe around the head dont do it the fins on the head are cooling fins so it wont make a difference get a small buggy engine insted if you want to replace the engine like one in the pics below. as for the outrigger you need a lot of room to run them they dont have the best turning but are super fast on the straight in the gas fourum a nitro outrigger was keeping up with a gas one a 90mph it was in the realy old posts for the plane engine i wouldent use it keep it for a plane. i would save up for the marine engine but iam not you. some guys are putting the os.21 outbord on ther outrigger i know they cost 150 aprox but i heard they run great.
Just my 2 cents.



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Old 02-03-2006, 05:59 AM
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Default RE: Speed freak needs help!!!

Do you want speed, or cheap? These two things are usually mutually exclusive.

I have airplane engines and boat engines. While I do think that compared to plane engines, many boat engines are overpriced, I also know that they are quite different. Airplane engines don't have the torque and RPMs required for fast boats.

IMO, a .21 rigger is just about the worst possible choice for getting started. Yes, they are fast, and one would think that because they are small, they would be cheap, but that's not really true. If you want them to go fast, you need a good engine. Also, it takes time and experience to get everything setup to the point where you can get reliable speed. When I decided I wanted a rigger last summer I talked to several people who raced them. Every person I talked to said do not start with a .21, that size is too fussy. Even if you can get it to run well, riggers are not suitable for running on open water, they belong on ponds that are dedicated to racing.

Alternatives that will be fast, but better starter boats, are tunnel hulls, catamarans, and monos.

The new Topspeed 2 costs around $100. Add to this a $300 engine from OS, a $100 radio, and $100 in support equipment and you're pretty much ready to go. http://www2.towerhobbies.com/cgi-bin...?&I=LXKHW9&P=7

Another choice if you want to assemble your own boat is to buy an Aeromarine Mean Machine hull and hardware, (about $300) an OS .21 marine engine (around $140), radio and support equipment.

There's also the soon to be available new Miss Elam http://www2.towerhobbies.com/cgi-bin...I=LXLHC2**&P=7 that comes ready to run for $300. However, as with a rigger, hydros really need the calm water you find on a closed pond.

And finally, if you really want to build your own from wood, look into the Wild thing mono hull with a .21 marine, or perhaps car, engine. There are several build threads here.

I think any of these choices would give you plenty of speed and much easier setup than a .21 rigger.
Old 02-03-2006, 09:04 AM
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matt407
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Default RE: Speed freak needs help!!!

Thanks guys,

I will avoid the outriggers untill i get a bit more experianced. Does any know of where i can get secong hand marine engines?? I have looked on the site but nothing there and ebay is like a mine field. I purchased a Thunder tiger pro .15 mx pull start and when i arrived it was minus a carb, I have searched high and low and cant find one so i scrapped that project. Does anyone have a knowlegde on these "airboat" things that al for sale on ebay

http://cgi.ebay.com/DUMAS-BIG-SWAMP-...QQcmdZViewItem

They look like they may b fast.. I think i will go for a tunnel hull and have to wait until an os .21 outboard comes up. As i cant afford $300. May not be a lot to you guys but when your a student its 2weeks food.lol.

thanks for now

matt
Old 02-03-2006, 09:39 AM
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matt407
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Default RE: Speed freak needs help!!!

hi everyone i have been looking on ebay and these boats look like good deals anyone got any opions ??

http://cgi.ebay.com/PRATHER-31-outbo...QQcmdZViewItem


http://cgi.ebay.com/NITRO-3-5cc-TUNN...QQcmdZViewItem


http://cgi.ebay.com/Prather-lap-cat1...QQcmdZViewItem


http://cgi.ebay.com/AREOMARINE-SPRIN...QQcmdZViewItem

http://cgi.ebay.com/26-Bandit-Tunnel...QQcmdZViewItem



thanks again

matt
Old 02-03-2006, 01:07 PM
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Default RE: Speed freak needs help!!!

Here's my opinion of each:
1) Owner says he doesn't know what he's doing. I see major rework required, so as a beginner, stay away
2) Dumas ABS hull says trouble. ABS and nitro aren't compatible, so there could be hull damage
3) A glass hull with a K&B .21 is a good combo. Since it's being sold RTR with spare parts, I would look at this one
4) A cracked deck and a .81 says he was wave jumping. I'd be wary of this one, as a cracked deck is probably the tip of the iceburg
5) Forget it, seller won't ship across the pond.
Old 02-03-2006, 06:44 PM
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Default RE: Speed freak needs help!!!

1) I have to agree with HJ, the boat has serious issues.
2) OK boat but the ABS version isn't as good as the wood kit. Dumas messed up the plastic version and this was right from the designer himself as they didn't make the sponsons deep enough. It's an OK boat but not great.
3) It has the Prather modification, translation is that it has an exhaust throttle, not good for a first-time boater as they can be a big hassle to get running properly as opposed to a regular carb.
4) An .81 in a hull made for a smaller powerplant?
5) Too bad that he'll only ship in the USA.

If you're looking for cheap and want to use a small engine, the air-cooled engines can work in a boat as long as the heat sink can get cooling air. What also has to be watched is what type of threading is on the crank. The SG style won't work in a boat and the short threads aren't long enough to get the flywheel and flex cable collet onto. Slide carbs are a little harder to hook up but can be done.
Old 02-05-2006, 04:57 PM
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matt407
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Default RE: Speed freak needs help!!!

Thank guys .

I will put a bid in with the 3rd boat. Will let you know how i get on.

matt
Old 02-08-2006, 07:40 AM
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matt407
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Default RE: Speed freak needs help!!!

hi

i have won this boat anyone got any views on it??? Its supposed to do 40mph!!! so they say. I my try and put a .21 os marine engine in it when funds allow..

http://cgi.ebay.com/ws/eBayISAPI.dll...MEWN%3AIT&rd=1




oh for you guys across the pond theres seems to be a good cheap boat which needs a bit of work

http://cgi.ebay.com/ws/eBayISAPI.dll...MEWA%3AIT&rd=1


cheers matt

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