User Tag List
Thanks: 0
Likes: 0
Results 16 to 30 of 32
Thread: all chopper info
-
05-05-2013, 10:30 AM #16
Toffy,i came across a 26 big ear merc offshore cut that was hubbed for an omc,over the hub btw.it is the best handling prop I've run yet.no chinewalking at all
-
05-08-2013, 10:21 AM #17Markus' Performance Boating Links:
www.toastedmarshmallow.com/performance
-
05-08-2013, 10:41 AM #18
Modified to fit OMC means it should still fit straight on a Merc. I seem to remember reading Yammie is the same as Merc.
I was going so slow I almost crashed. - JamesGang
1978 24 Superboat - 250 EFI
Sold: 1991 Starliner - 250 EFI Merc 3.0
-
05-09-2013, 02:04 PM #195000 RPM
- Join Date
- Apr 2006
- Location
- Belgium - near city of Ghent
- Posts
- 161
- Thanks (Given)
- 0
- Thanks (Received)
- 0
- Likes (Given)
- 0
- Likes (Received)
- 0
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
-
05-09-2013, 03:46 PM #20
Here's a good example of this type of cut. The leading edges have been trimmed, the cutters and leading edge of the blade root have been ground away, and some mild cup has been added. Hoss makes some nice props that are close to this style.
'89 Hydrostream Vegas XT, '90 Merc 2.4 Bridgeport PCU EFI
My YouTube videos________My Flickr photo gallery
http://www.facebook.com/profile.php?id=1706097519
-
05-10-2013, 02:00 PM #215000 RPM
- Join Date
- Apr 2006
- Location
- Belgium - near city of Ghent
- Posts
- 161
- Thanks (Given)
- 0
- Thanks (Received)
- 0
- Likes (Given)
- 0
- Likes (Received)
- 0
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
Thanks Pyro !
-
05-10-2013, 04:28 PM #22
Toffy have you tried Nico at Bernico? They have loads of props
-
05-11-2013, 02:24 AM #235000 RPM
- Join Date
- Apr 2006
- Location
- Belgium - near city of Ghent
- Posts
- 161
- Thanks (Given)
- 0
- Thanks (Received)
- 0
- Likes (Given)
- 0
- Likes (Received)
- 0
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
Hi ! Thanks for that advice. I already talked to him and this seems definately the way tho go. But for now I don't want to go that way, as after a proptest session I would feel obligated to buy a new prop from him. Nothing wrong with that off course but I just don't want to spend that kind of money. It's still a hobby, and there must be a good second hand prop out there for me that can outperform my Tempest Plus
-
05-11-2013, 06:59 AM #24
You have been given excellent advice on choppers but from reading what boat, motor and prop you have run and what you want I recommend you try either a Yamaha T1 or M in 26 pitch or a Turbo lightning 26. They will all give you more overall lift, including stern to help your speed, give excellent handling and no chine walk. I have run every prop you have mentioned on here.
1990 22' Activator Yami HPDI 300-sold-86.4
1976 21' Challenger 2002 3.1 Yami 250 Vmax phase lll 89.7-sold
1982 21' Superboat 300merc-87
1990 22' Activator yami OX66 Vmax 250-84.2
1982 30' Scarab-twin 200 Merc-sold
1979 21' Challenger 300 Evenrude-sold
1979 21' Superboat 200 Merc-sold-72
-
05-11-2013, 08:31 AM #255000 RPM
- Join Date
- Apr 2006
- Location
- Belgium - near city of Ghent
- Posts
- 161
- Thanks (Given)
- 0
- Thanks (Received)
- 0
- Likes (Given)
- 0
- Likes (Received)
- 0
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
Nice advice from someone who've tried em all, thanks ! I'll surely try them when I get the chance. :up:
-
05-22-2013, 03:05 PM #265000 RPM
- Join Date
- Apr 2006
- Location
- Belgium - near city of Ghent
- Posts
- 161
- Thanks (Given)
- 0
- Thanks (Received)
- 0
- Likes (Given)
- 0
- Likes (Received)
- 0
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
Hi all,
I've found some more info and pictures on different cuts.
It seems that a chopper with standard blades can be cut to different styles...
http://www.sdspropshop.com/Prop_Work/Prop_Work.html
Why would you chose for a specific style of cut ?
Could one say a certain style always leads to a specific handling of the boat ? eg. less chinewalk, more bowlift, more top-end...
Thanks for sharing info,
Kind regards, T.
-
05-22-2013, 05:34 PM #27
That's Steve... He's a vendor on this forum.
'89 Hydrostream Vegas XT, '90 Merc 2.4 Bridgeport PCU EFI
My YouTube videos________My Flickr photo gallery
http://www.facebook.com/profile.php?id=1706097519
-
07-09-2013, 10:57 AM #285000 RPM
- Join Date
- Apr 2006
- Location
- Belgium - near city of Ghent
- Posts
- 161
- Thanks (Given)
- 0
- Thanks (Received)
- 0
- Likes (Given)
- 0
- Likes (Received)
- 0
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
Hi ! I did some fun proptesting this weekend :
- Tempest Plus 25P : 115km/h @ 5900rpm
- Chopper 28P : 108 km/h @ 5800rpm, too much ventilation, takes long to get on plane and when it starts to pull. better handling at speed and also shorter cornering compared to the tempest plus, similar bowlift though where I expected more...
- Cleaver 26P : never got on plane... didn't expect it to be that bad. I probably need more engine height for that cleaver but I don't have a low water pick up.
Still got some testplans :
chopper 26P (It'll teach me if I must let go 3blade over the hub type of props)
Pro ET 26P (I expect great things from this 4 blade prop)
for the longer future :
Trophy Plus (should accelerate fast, curious about top speed numbers)
Turbo lightning, Yamaha drag, T1, M.... if I can find them
Kind regards,
T.Last edited by Toffy; 07-09-2013 at 11:32 AM.
-
07-09-2013, 11:08 AM #295000 RPM
- Join Date
- Sep 2009
- Location
- iowa
- Posts
- 674
- Thanks (Given)
- 1
- Thanks (Received)
- 2
- Likes (Given)
- 5
- Likes (Received)
- 8
- Mentioned
- 0 Post(s)
- Tagged
- 0 Thread(s)
The problem you have with getting on plane has to do with the prop venting too much. If your exhaust was relieved somewhere other than the propshaft it would get on plane much better. I can't get my baja to plane out with an over hub prop cause it just vents real bad.
1975 Hydrostream Ventura II
1987 evinrude 200xp
-
07-09-2013, 11:34 AM #30
With a true surface prop, when the boat initially lays down on plane, there is a great amount of slip as the prop first meets the surface-- the prop is trying to grab more water than the surface can provide, as the boat's speed hasn't yet caught up with the speed of the spinning blades. Relieved exhaust will control the initial rev-up when you first hit the throttle, but it can't do much to control the planing slip that occurs afterward. The best approach is to give full throttle at first, so the boat has some momentum when it lays down, then feather the throttle to allow the water to fall into the blades before getting back on the throttle again. With some props, you have to just stand on the rev limiter until it catches the water.
Props such as the Trophy have a heavy trailing edge with lots of cupping cast into the blade. These props will have less planing slip, even when you run on the surface.'89 Hydrostream Vegas XT, '90 Merc 2.4 Bridgeport PCU EFI
My YouTube videos________My Flickr photo gallery
http://www.facebook.com/profile.php?id=1706097519