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-   -   .45 Engine Questions (https://www.rcuniverse.com/forum/speed-rc-nitro-boats-117/3478812-45-engine-questions.html)

MiniMental 10-22-2005 05:46 AM

.45 Engine Questions
 
Hi, more questions... :eek:

i wish to know if a .21 speedmaster hull would handle a .45 engine? i want it to be stupidly fas and pwerful, but is this just to much? any help would be appreciated...

When i say stupidly fast and dangersouly fast i mean it :D, i dont know if the hull would hadle it though, what do you people think??;)[8D]

If not does anyone have the price of a .45 microburst hull??

MiniMental 10-22-2005 07:20 AM

RE: .45 in a .21
 
I have another query, if you have an engine that has, a water colled head, and exhaust header, will one water pickup give enough water to flow through both the exhaust header and the head?

piper_chuck 10-22-2005 07:23 AM

RE: .45 in a .21
 
In general, probably not. Racing hulls are designed with a specific engine in mind. Since it's designed for racing, it's already built as small and light as is practical for that engine size. Using a larger engine will create all sorts of trim problems. You may be able to overcome them, but if this is your first boat, you'll most likely just end up with a boat that's upside down more than it's right side up. The best formula for most boats is to use the recommended engine size and hardware, and set it up according to the designers instructions.

piper_chuck 10-22-2005 07:24 AM

RE: .45 in a .21
 

ORIGINAL: MiniMental

I have another query, if you have an engine that has, a water colled head, and exhaust header, will one water pickup give enough water to flow through both the exhaust header and the head?
Yes, until you get to really big engines.

MiniMental 10-22-2005 07:24 AM

RE: .45 in a .21
 
LOL! thanks for that piper, u put that in perspective for me, i wil stick with my homemade hull for now (pics in my other post) and upgrade to a microburst .45 later next year

piper_chuck 10-22-2005 07:46 AM

RE: .45 in a .21
 
Something I forgot to mention. You will learn way more about setting up a boat if you begin with a low powered engine than a high powered one. The low powered engine will force you to squeeze every possible bit you can out of the hull through proper tuning and trimming. Using an over powered engine allows you to be sloppy.

MiniMental 10-22-2005 07:54 AM

RE: .45 in a .21
 

if you begin with a low powered engine than a high powered
do you mean if i use an engine that is the right size for the boat or start with a smaller boat. i understand that this isnt at all the same, but i hgave a fair biut or expeirience with .45 (7.5cc engines), i know that this doesnt mean i know anything or everything about marin .45's but ahh well, i'll learn wont i :P:D

piper_chuck 10-22-2005 08:24 AM

RE: .45 in a .21
 

ORIGINAL: MiniMental


if you begin with a low powered engine than a high powered
do you mean if i use an engine that is the right size for the boat or start with a smaller boat. i understand that this isnt at all the same, but i hgave a fair biut or expeirience with .45 (7.5cc engines), i know that this doesnt mean i know anything or everything about marin .45's but ahh well, i'll learn wont i :P:D
I mean start with the right size engine. For example, if you decide on a .21 size boat, get a .21 engine such as the OS or OPS. Learn how to operate the engine and how to trim the boat to get the most out of the engine. Once you have some skills, if you still need more speed, consider upgrading to a more powerful (and much more expen$ive) engine such as a MAC, Nova Rossi, etc. Same if you are starting out with a .45 size boat, get an OS, OPS, or even K&B engine.

MiniMental 10-22-2005 08:26 AM

RE: .45 in a .21
 
ahh, i get you now, well, i mgoing to continue in my tradtional (for me :D) line of 7.5cc engines :P

Would people also check my other threads for a post about stringers aswell please, i have no idea what im doing for them

Ron Olson 10-22-2005 08:42 AM

RE: .45 in a .21
 
1 Attachment(s)
When I bought my 40" Microburst, I think that it was $185.00 in white and $35.00 for colors. This was a while ago, a good 4 years.

MiniMental 10-22-2005 08:46 AM

RE: .45 in a .21
 
cool, ide just like to point out to everyone that Ron Olson ROCKS![8D], you wouldnt happen to have any vids of the .45 microburst running would you, i wanna white one :P, i'l paint it myself lol.

if i get a micrburst hull, and put a .45 in it, can you recommend a fuel tank for me? something that will give me about 6mins runtime without affecting CG and Weight to much

MiniMental 10-23-2005 06:48 AM

RE: .45 Engine Questions
 
Yo all, another dilemma

Should i get thistank for my 36" .45 mono? apparently it fits right inbetween the rails, i dont know if its to big though, any one else know of a tank thats the right size for my boat that fits in 5" rails?

Oh yeh, lol, putting the tank up might help..[link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXBWK6&P=0]Tank[/link]

piper_chuck 10-23-2005 07:19 AM

RE: .45 Engine Questions
 

ORIGINAL: MiniMental

Yo all, another dilemma

Should i get thistank for my 36" .45 mono? apparently it fits right inbetween the rails, i dont know if its to big though, any one else know of a tank thats the right size for my boat that fits in 5" rails?
What tank? A Sullivan BT-16 works well for these specs. I happen to have 2 extras. I'll go do pics when I finish my morning email.

MiniMental 10-23-2005 08:35 AM

RE: .45 Engine Questions
 
added tank to my last post,

which hull do you think?

40" Microburst .45
OR
AeroMarine Challanger 31" .45

piper_chuck 10-23-2005 11:22 PM

RE: .45 Engine Questions
 
I think you need to decide what you're going to do. A few posts ago your plan was to finish your home built hull. Now you're looking at a new hull.

If you're going to finish your own hull, to run as a fun boat, or perhaps to get started in racing, a decent engine and hardware, perhaps even second hand, will do just fine. However, if you're going to spend the money on a new Microburst, Twincraft, Seaducer, or other well known racing hull, then the best bet for success is to buy the hardware specified by the manufacturer, and install it exactly as they say. I can assure you that the new hull route is going to cost significantly more than finishing up your home built hull. However, if you setup the new hull the way it's supposed to be, it'll be fast and stable from the start. Get where I'm going with this?

MiniMental 10-24-2005 05:09 AM

RE: .45 Engine Questions
 
yes, it will cost 2 much for a new one, i will stick with mine :P thanks piper :D


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