Reply
 
Thread Tools Search this Thread
 
Old 10 December 2018, 15:50   #11
Member
 
Country: USA
Town: Las Vegas
Make: Bombard Commando C4
Length: 4m +
Engine: 50 hp Tohatsu
Join Date: Jul 2015
Posts: 111
Quote:
Originally Posted by DiabloLoco View Post
I would suggest a higher pitch, like 19 or 21 to increase speed.

That would be to much prop for my boat/motor set up, I have both 14 and 15 pitch prop, the 15 pitch has me at 33 mph at 5700 to 5800 rpm, the 14 pitch has my rpm's at 6100 but the boat takes off fast with the 14.

16 pitch would be my max if I ever wanted to try it but that would lug my motor.
__________________

__________________
jackreno is offline   Reply With Quote
Old 10 December 2018, 16:02   #12
Member
 
Country: USA
Town: Las Vegas
Make: Bombard Commando C4
Length: 4m +
Engine: 50 hp Tohatsu
Join Date: Jul 2015
Posts: 111
Quote:
Originally Posted by jonp View Post
I wouldn't change prop pitch as the one you are currently using already gets you into the max rpm range with just one person onboard. A larger pitch will reduce your max rpm and put more strain upon the engine, especially if you load the boat with more than just yourself.

Personaly I've never liked using any kind of foil on outboards, partly as they wave your warranty rights on new outboards over this side of the pond. I've also had some diverse dangerous experiences using them in very rough weather on standard mono hulls.

Prop shape can make some difference as can extra cupping of the blades. Engine mounting height can also effect speed but I doubt you will reach that 40mph from simply raising one or two holes but you will gain speed.
I have a hydraulic transom plate and can adjust my motor height up to 5 inch's on the go, I can take it so high I lose prop grab at high speed than bring it down to maintain my 33 mph..


As reading other post on here and on other threads it appears I am at what my boat/motor combo will do with the Bombard C4, I am not disappointed with my speed just thought it would have been faster.

However I can go into very shallow waters and that I like, the hydro foil lifts my back out of the water at very slow speed and with the hydraulic transom plate I set my motor height up high and I can run in 12 inch's of water safely.
Attached Thumbnails
Click image for larger version

Name:	ahjm-4-dp-atlas-micro-jacker-hydraulic-jack-plate-500.jpg
Views:	57
Size:	78.4 KB
ID:	127931   Click image for larger version

Name:	mz_-m5_black_close_up_4_8.jpg
Views:	58
Size:	24.0 KB
ID:	127932  
__________________

__________________
jackreno is offline   Reply With Quote
Old 10 December 2018, 16:12   #13
Member
 
Country: USA
Town: Las Vegas
Make: Bombard Commando C4
Length: 4m +
Engine: 50 hp Tohatsu
Join Date: Jul 2015
Posts: 111
I also added a 2nd layer of PVC on the bottom of my boat for the swallow water use and beaching the boat, I don't think it slowed my speed down but I don't have to worry much about rocks and such now.
Attached Thumbnails
Click image for larger version

Name:	IMG_2058.jpg
Views:	66
Size:	127.2 KB
ID:	127933   Click image for larger version

Name:	IMG_2050.jpg
Views:	66
Size:	94.8 KB
ID:	127934  
__________________
jackreno is offline   Reply With Quote
Old 10 December 2018, 20:18   #14
Member
 
Country: USA
Town: California
Make: zodiac futura
Length: 4m +
Join Date: May 2018
Posts: 167
Here are some SIB videos I posted on youtube. Showing speed with two different motors.
My boat was first setup with a 40HP 4 stroke but the performance was sluggish from what I wanted. It felt stuck to the water.
Over winter I sold the 40 and ordered a 60hp ETEC 2 stroke.
The 40 would push the boat at 30 mph, the 60 only bumped it 7 mph to 37 but it feels like its flying now. Far faster than what you would think a 7 mph should feel like. Its very stable!
Pics and videos below.

This video is the 40hp at 30mph. https://youtu.be/tOutzKXC9f0

This video shows the 60hp going 37mph in light chop. Parker Strip, AZ. https://youtu.be/0As0I1KM0tQ

On glass heading up river to Topic Gorge Lake Havasu, AZ. https://youtu.be/iVxUxJNQgIc

End of day heading back to the London Bridge! The very you you UK guys sold us. We put it in the desert!
https://youtu.be/gqOr18CK1cg
Attached Thumbnails
Click image for larger version

Name:	IMG_6862.jpg
Views:	56
Size:	130.7 KB
ID:	127937   Click image for larger version

Name:	IMG_6593.jpg
Views:	59
Size:	150.6 KB
ID:	127939   Click image for larger version

Name:	IMG_6601.jpg
Views:	58
Size:	126.8 KB
ID:	127940   Click image for larger version

Name:	IMG_6511.jpg
Views:	59
Size:	133.3 KB
ID:	127941  
__________________
pagick is offline   Reply With Quote
Old 10 December 2018, 23:05   #15
Member
 
Country: USA
Town: Las Vegas
Make: Bombard Commando C4
Length: 4m +
Engine: 50 hp Tohatsu
Join Date: Jul 2015
Posts: 111
That's a nice boat pagick, I was thinking of going with a larger HP motor but was a little worried about the extra weight on transom, I have a 2018 Tohatsu 4 stroke 50hp, it is the lightest in its class and has 15 inch shaft for the Bombard C4, weights only 209 lbs plus the 23 lbs for the hydraulic transom plate = 232 lbs on a transom rated for 235 lbs, I did add supports to my transom to make sure bouncing on waves don't do damage.

I was looking at the Evinrude's but they sure were pricey but hear they are great motors.

So far I am happy with the Tohatsu, its has some good grunt and takes off really fast.
__________________
jackreno is offline   Reply With Quote
Old 11 December 2018, 10:24   #16
Member
 
Country: USA
Town: California
Make: zodiac futura
Length: 4m +
Join Date: May 2018
Posts: 167
With the ETEC evenrude the 40,50 & 60 all are 60 hp with different software to reduce the lower hp units. My zodiac dealer said the boat can handle it and I should get 40 mph. Boat insurance wasn’t a problem either.
When I got my ETEC, Evenrude offered a free extended warranty. 10 years. First service is at 300 hr or 3 years. Weight is 247# just under the max engine weight. I saved almost $2000 getting it from Wisconsin.
__________________
pagick is offline   Reply With Quote
Old 22 December 2018, 16:34   #17
Member
 
Country: USA
Town: Las Vegas
Make: Bombard Commando C4
Length: 4m +
Engine: 50 hp Tohatsu
Join Date: Jul 2015
Posts: 111
Hey pagick I was wondering if your top speed is hurting cause you have the canopy up, when I had a pontoon boat even though it was slow it would loose about 2 to 3 mph with the canopy open vs being closed.
__________________
jackreno is offline   Reply With Quote
Old 22 December 2018, 18:29   #18
Member
 
Country: USA
Town: California
Make: zodiac futura
Length: 4m +
Join Date: May 2018
Posts: 167
PCanopy did not make much difference. At most 1 mph lower.
I have been talking to some guys about props and my rpm. One prop was recommended that is said to possibly get me 3-4 mph more. I bought it used so if it doesn’t help I can flip it. It’s a semi cleaver in stainless designed by evenrude 19p. My prop now is 17 chopper in alu. I am also planning on over pressuring the tubes a1/2 psi. That is said to get me a few mph more too. According to my zodiac dealer. So if both guys are half right I can hit the magic 40 mph
Also my speed stated is in 110-120f degree air. That is slower. I went to same waterway when it was 85deg and I got another 1.5 mph out of the boat.
Too bad there isn’t an anti-wetting agent you can put on the bottom to make it more slick on the water at speed.
I’m looking forward to boating with you this summer on lake havasu especially since our boats have similar setups. And for once I’m not the only sib on the lake.
__________________

__________________
pagick is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 12:05.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.