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Homelite speed - 6/15/2005 5:02 PM   
jdoug


 

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Status: offline 		I'm a little new to this boating scene. I'm building a 46" vee with a 25cc Homelite that is water cooled has a WHH crank case stuff plate and a tuned dry pipe. The hull and everything will weigh around 18lbs. (feels quite heavy). I'll be running a P275 sharp and balanced SS prop surface driven with dual rudders. Does anyone else out there have a similar setup? I know there are many variables in setup and hull/hardware combos to get as much speed as possible with the engine I'm running. If anyboby has a similar setup and has run their boat - What kind of speed should I expect to see?

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RE: Homelite speed - 6/15/2005 6:23 PM   
Captain Ramius


 

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Status: offline 		Any port mods?

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RE: Homelite speed - 6/15/2005 6:28 PM   
jdoug


 

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Status: offline 		No port mods. Also has WA 167 carb on it.

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RE: Homelite speed - 6/15/2005 7:17 PM   
kevin28


 

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Status: offline 		I would say 28-30 mph.

It won't really wake up till start the cylinder mods

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RE: Homelite speed - 6/15/2005 7:33 PM   
barnstormerboats



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Status: offline 		Kevins speed guess is pretty close. The only thing I would warn you about making power mods to the Homelight is that they will seriously reduce the life of the engine. It just is not designed for the higher power and you will easily bend the crank with a higher power config. If you are really looking for alot more speed, you might consider changing the engine to a quality dual bearing crank motor like the zenoah or sikk.

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RE: Homelite speed - 6/15/2005 7:55 PM   
jdoug


 

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Status: offline 		Thanks for the info! This is my entry level play boat for me to start. My next boat will be powered by zenoah.

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RE: Homelite speed - 6/15/2005 11:53 PM   
skoda450



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Status: offline 		Everyone who wants more speed (and that's everyone) goes from Homelite to Zenoah first. If your appetite is still not satisfied then to Qucikdraw then Mathe if you have the bucks. Somewhere along the line your appetite or money will run out. And you may still get beat by a Homelite that's still running after your s... hot $3000 motor quit before the end of the race!!!



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RE: Homelite speed - 6/18/2005 8:01 PM   
mbba2002


 

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Status: offline 		Why are you running a 275 prop on a Homelite motor. Your loosing power and the speed is not noticeable. I have tried that prop and didn't see a improvement. I have a modified Homelite 30 cc motor in a 48" boat and I am running a 270 prop. I can go 40 MPH and more with the right conditions. THe 275 prop will bog the motor down and loose speed. My boat stock with a 265 prop would go 30 +mph.

< Message edited by mbbaj2001 -- 6/18/2005 8:04 PM >

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RE: Homelite speed - 6/19/2005 8:43 PM   
TERBObob



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Status: offline 		First , and easiest mods --- change the carb to a 167 and then get yourself a tuned pipe . They sell them all the time on EBAY . Or you can get one for a 13 CC nitro ( also works quite well ) .
As was said above , the HOMIEs are good strong engines , but do not rap out as high as the ZEN .
With a HOMIE , you want to improve the HP and torque , not the RPM . ( because , also , as stated above - the con rod can not handle the speeds )
Also , might try a back-cut on that prop you are now running .... will allow the engine to wind up .

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RE: Homelite speed - 6/20/2005 9:23 PM   
skoda450



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Status: offline 		Since we moved to prop mods, What exactly is a "back cut". Is that removing the "ears", i.e. the part of the blade that looks like an ear lobe and part of the leading edge?

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RE: Homelite speed - 6/20/2005 10:11 PM   
TERBObob



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Status: offline 		Please view the picture . As it would best describe the BACK-CUT :



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RE: Homelite speed - 6/21/2005 11:05 PM   
skoda450



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Status: offline 		Wow, was I on the wrong side of the blade! Any idea what the notches do that produces the desired effect?

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RE: Homelite speed - 6/22/2005 12:44 AM   
jdoug


 

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Status: offline 		I think they are to allow the prop to "slip" a little on take off or heavy loads. When the prop is submerged, a back cut allows the engine to wind up and get into the higher RPMs and keep the boat from boggin' down. When the boat is on a plane, the cutt away part of the prop wouldn't much touch the water anyway.

Back cut result - Better bottom end power with the same top speed or RPMs.

prop guys correct me if I'm wrong.

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RE: Homelite speed - 6/25/2005 3:47 PM   
TERBObob



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Status: offline 		Not a "prop" guru , but that is absolutely correct .

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RE: Homelite speed - 6/25/2005 4:35 PM   
project5k


 

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Status: offline 		so you just cut the 2 u groove spots in the prop and that unloads it when its submerged? hmm, that looks like something i might try after i get mine up and running...

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RE: Homelite speed - 6/25/2005 5:50 PM   
Captain Ramius


 

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Status: offline 		Go to http://www.rcprops.com/ to learn about props and for a good chart for recommendations.

Those notches are known as a "Barr Cut"
It reduces the torque required to spin it. Remember to check balance after any mod , and do a little at a time.

There is also a "Texas Cut" but that is removing metal from the leading edge in the tongue area. Reducing the tongue can allow for more rpm.

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RE: Homelite speed - 6/25/2005 6:15 PM   
TERBObob



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Status: offline 		Thought all those props were cut and bent for Zens and QD's

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RE: Homelite speed - 6/25/2005 11:26 PM   
Captain Ramius


 

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Status: offline 		Not really , a good running QD will take the pitch out of a thin prop.
A strong engine doesn't need tricks to spin a prop fast.

The chart on Paul Gosteves site gives recommmendations for homies too.
Cut and bent is extreme, more like sharpened and balanced , the bending is so slight you need a pitch measruing device to see if you made a change or not. Unless you have a very skilled eye , you can't tell the difference between a 5.1 cup and 5.3 cup at the trailing edge.
Pleny of guys have recommendations for homies , not need to get beyond the basics. Try a Octura X470 , or a Prather 270 to start.

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RE: Homelite speed - 6/26/2005 12:29 AM   
TERBObob



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Status: offline 		Hummmm ... always thought that the "guru's" bent and cut ....

balance and sharpen - just about anyone can do as long as they are careful AND have a GOOD magnetic balancer.


( my boo-boo to all you prop "bending" guru's out there .... )

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RE: Homelite speed - 6/26/2005 7:30 AM   
BBuster


 

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Status: offline 		I run a sub-surface prather 270 prop w/G-26. It sounds like back cutting is desireable for surface drive.

Do you guys recomend back-cutting for me?

Hand filed entire leading edge razor sharp & balanced.

Did I screw up or do ok?

I have another prather 270 prop that I have not touched yet.



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RE: Homelite speed - 6/26/2005 4:00 PM   
project5k


 

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Status: offline 		i think that the question now is how well is it ballenced?

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RE: Homelite speed - 6/26/2005 9:03 PM   
TERBObob



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Status: offline 		View pic ...
The red line shows where you can thin the edge leaving the area closest to the prop , the thickest .
The blue line shows where you should sharpen .
The green line shows where you should NOT sharpen . This area is palce that allows the prop the "cup" the water and "grab" it , so to speak.
By the looks of the picture , you did not do too much damage to the prop , and it should still be ok . But for future use , stay clear of the inside area untill you want to try and do some mods yourself and won't get bothered if you mess up a prop ( and as costly as they can get , sometimes its better left alone . - other than sharpening and balancing . )
One more thing ... when sharpening them , you want them to be as smooth as glass . The smoother , the better . Whether you choose to polish them , well , thats another can of worms . I , myself , find it a BIG pain in the keester .
Also , try not to thin them TOO much , otherwise , they WILL bend on you under the pressure when running .
And , if I might suggest , try using the BC ( berillium copper ) ones , they are a LOT easier to work with AND less dangerous . ( the BC dust CAN be VERY harmful - s0 be sure to wash your hands and arms when done , and if possible , do it OUTSIDE . And watch those fingers when sharpening . Much hamburger has been made from sharpening props ( and I'm NOT talking from cows, but rather fingers ! )


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RE: Homelite speed - 6/26/2005 9:31 PM   
Captain Ramius


 

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Status: offline 		what pic?

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RE: Homelite speed - 6/26/2005 9:53 PM   
BBuster


 

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Status: offline 		My props are BC. Cost is not a real issue.

The only pic you have is the origional one. Don't see any colored lines defining areas.

Very interested in following suggestions in preping my back-up prop.

If you missed posting the 'tutorial pic', please try again.



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RE: Homelite speed - 6/26/2005 9:55 PM   
TERBObob



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Status: offline 		Duh ... sorry about that ...

Also , the reason I said about BC props is because the one you shown is SS


< Message edited by TERBObob -- 6/26/2005 9:58 PM >

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