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PROP HELP - 6/11/2008 2:35:08 AM   
ezflyer



Posts: 45
Joined: 10/12/2003
From: Welsh, LA, USA
Status: offline 		hi there i just traded some airplane stuff for a boat and took it to the water this weekend and i think i am hooked. the boat did not run as fast as i would have tought it should. maybe 20 mph. i tried to trim it up as much as i could. the shaft comes out of the bottom of the hull and not the transom. it has a maculla weed waker motor and i tuned it to its best rpm and it still was no faster. it is a 54" fiberglass hull and is fairly heavy to me. can you guys tell me about what size prop i should have for speed. any help would be much apreciated. thank you
       Post #: 1

RE: PROP HELP - 6/11/2008 3:08:57 AM   
build4less


 

Posts: 29
Joined: 4/6/2008
From: , IL, USA
Status: offline 		If you are running a stock zenoah, a good starting prop would be a prather 270 or 275.

(in reply to ezflyer)
       Post #: 2

RE: PROP HELP - 6/11/2008 3:15:34 AM   
ezflyer



Posts: 45
Joined: 10/12/2003
From: Welsh, LA, USA
Status: offline 		i know on a full size prop you have a number for size and one for pitch . is there such a thing in model props. for example 10"x21 pitch and thanks for the help i will see what size i have and go from there.

(in reply to build4less)
       Post #: 3

RE: PROP HELP - 6/11/2008 3:54:41 AM   
mopartybob


 

Posts: 1711
Joined: 6/5/2006
From: south san francisco, CA, USA
Status: online
quote:

ORIGINAL: ezflyer

i know on a full size prop you have a number for size and one for pitch . is there such a thing in model props. for example 10"x21 pitch and thanks for the help i will see what size i have and go from there.

Here's some prop info you might find useful http://www.rcprops.com/TechNotes/rcprop_tech_info.htm

_____________________________

Humans never cease to amaze me.........BlackSheepSquad-Banned from "the Zone"

(in reply to ezflyer)
       Post #: 4

RE: PROP HELP - 6/11/2008 5:23:37 AM   
Ron Olson



Posts: 12732
Joined: 5/10/2002
From: Kalamazoo, MI, USA
Status: offline 		Read it again guys, he's running a Mac, not a Zen or any other engine.
Seriously, you're not going to get a lot of speed out of a Mac and 20 MPH is about it, maybe 25 max.

_____________________________

Member, Southwest Michigan Model Boat Club.

(in reply to mopartybob)
       Post #: 5

RE: PROP HELP - 6/28/2008 1:58:14 AM   
y0ungbl00d


 

Posts: 10
Joined: 6/20/2008
From: Puerto Princesa, , PHILIPPINES
Status: offline 		Guys, I am building the 48 inch woody and I will be using a stock homelite 26cc. What do you think about the Prather 265? Is it too small?

(in reply to Ron Olson)
       Post #: 6

RE: PROP HELP - 6/28/2008 4:46:14 AM   
Ron Olson



Posts: 12732
Joined: 5/10/2002
From: Kalamazoo, MI, USA
Status: offline 		Use at least a 270.

_____________________________

Member, Southwest Michigan Model Boat Club.

(in reply to y0ungbl00d)
       Post #: 7

RE: PROP HELP - 6/28/2008 5:44:00 AM   
MrMikeG


 

Posts: 1201
Joined: 9/24/2005
From: Mildura, AUSTRALIA
Status: offline 		275 or 280 would be better. Homelites come in 25cc or 30, no 26's that I know of.
Octura X470/3's are pretty good all around props too. that's my cut down 280 on RCProps site too!

(in reply to Ron Olson)
       Post #: 8

RE: PROP HELP - 6/28/2008 6:18:53 AM   
y0ungbl00d


 

Posts: 10
Joined: 6/20/2008
From: Puerto Princesa, , PHILIPPINES
Status: offline 		There are homelite trimmers with 26cc engines.

http://www.amazon.com/Reconditioned-Homelite-Non-CARB-Compliant-ZR21506/dp/B00127Z3KM

(in reply to MrMikeG)
       Post #: 9

RE: PROP HELP - 6/29/2008 4:26:20 AM   
MrMikeG


 

Posts: 1201
Joined: 9/24/2005
From: Mildura, AUSTRALIA
Status: offline 		I stand corrected, please show us pictures of it when you can as Homelite is owned by Ryobi now and I would like to compare it to the old Homelite castings.

(in reply to y0ungbl00d)
       Post #: 10

RE: PROP HELP - 7/5/2008 1:35:12 AM   
y0ungbl00d


 

Posts: 10
Joined: 6/20/2008
From: Puerto Princesa, , PHILIPPINES
Status: offline
quote:

ORIGINAL: MrMikeG

I stand corrected, please show us pictures of it when you can as Homelite is owned by Ryobi now and I would like to compare it to the old Homelite castings.


Here you go...

Attachments
Click to see fullsize image.
Click for fullsize 		Click to see fullsize image.
Click for fullsize


< Message edited by y0ungbl00d -- 7/5/2008 1:36:35 AM >

(in reply to MrMikeG)
       Post #: 11

RE: PROP HELP - 7/5/2008 4:28:38 PM   
martno1fan



Posts: 6931
Joined: 1/20/2005
From: blackpool, UNITED KINGDOM
Status: offline
quote:

ORIGINAL: ezflyer

hi there i just traded some airplane stuff for a boat and took it to the water this weekend and i think i am hooked. the boat did not run as fast as i would have tought it should. maybe 20 mph. i tried to trim it up as much as i could. the shaft comes out of the bottom of the hull and not the transom. it has a maculla weed waker motor and i tuned it to its best rpm and it still was no faster. it is a 54" fiberglass hull and is fairly heavy to me. can you guys tell me about what size prop i should have for speed. any help would be much apreciated. thank you

Id say your about at its max for a submerged drive boat,what prop are you using now?.You cant use a prather 270 or similar as these are surface drive props.You might want to ask someone who runs submerged drives with these types of motor?.You have a big boat there and a weedy is going to struggle even with surface drive to hit 30 mph in that size hull,i have a 48" woody with a 28 cc weedy and she hits 30 mph with surface drive.
Mart

_____________________________

im not argumentative im just missunderstood

(in reply to ezflyer)
       Post #: 12

RE: PROP HELP - 7/6/2008 4:51:32 AM   
ezflyer



Posts: 45
Joined: 10/12/2003
From: Welsh, LA, USA
Status: offline 		thanks martno1fan. and thanks to all of your comments , it has helped me out so much. i have been reading a lot of these forums and have decided to convert to a surface drive, for that will help out with the trimming out of the hull. i am also working on a homelite engine with a coil that has no rev limiter. this is were i am at now 30cc crank , 26cc piston , rod and cycnlder, big bore walbro, .005 or .006 squish , raised port timmig on both sides, and now tring to degree timming on fly wheel. yesterday it back fired and blew the cylnder off of the crankcase by pulling all the treads out of the jug. i have also reduced the crankcase volume. thank you all of rc universe boaters for yall have been so helpfull. keep the comments comming. my brain is like a sponge soaking it all in. and by the way my prop is a prather 270 polished and sharpned.

(in reply to martno1fan)
       Post #: 13

RE: PROP HELP - 7/6/2008 8:49:56 AM   
jacob711


 

Posts: 494
Joined: 11/16/2005
From: perth, AUSTRALIA
Status: offline 		.006 squish is too low that is probably why the jug blew off, you need somewhere around the .020 mark

(in reply to ezflyer)
       Post #: 14

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