Reply
 
Thread Tools Search this Thread
 
Old 02 March 2016, 19:01   #61
Member
 
Country: UK - England
Town: East Anglia
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Suzuki DF20 EFI
Join Date: Nov 2007
Posts: 3,276
Well the Aerotec hull is just a tad draggy and my experience vs other hull types is that it could be a knot or so down on yours with the same load... so you could be first in the chip shop at Brightlingsea.
__________________

__________________
Fenlander is offline   Reply With Quote
Old 03 March 2016, 03:03   #62
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 3,573
thats settled then gracious acceptance of defeat fish & chips supplied by the victor for his confidence in the right choice of engine possibly?
__________________

__________________
jeffstevens763@g is offline   Reply With Quote
Old 03 March 2016, 04:56   #63
Member
 
Stigomery's Avatar
 
Country: UK - England
Town: Cambridge
Boat name: SIBylle
Make: Honda Honwave
Length: 3m +
Engine: Honda BF20
MMSI: 235915576
Join Date: Oct 2015
Posts: 407
Deal! (I like plenty of salt n vinegar)

Surprised to hear you say the Aerotec is 'draggy' Fenlander - I thought it was the Ferrari of the SIB world (it's even red)!

Apologies for derailing this thread...
__________________
Stigomery is offline   Reply With Quote
Old 03 March 2016, 07:22   #64
Member
 
Country: UK - England
Town: East Anglia
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Suzuki DF20 EFI
Join Date: Nov 2007
Posts: 3,276
My only worry with the Chip Shop Stakes is the dealer looking at the usage data come service time!

As I say there is usually only a knot or so in it between SIBs but the Aerotec has a very deep V which can take more power to push through the water than any profile that is flatter... not that your Honwave is super flat but an absolute tea try of a profile will usually skim across the water the best.

It's not just the angle of the V but also that the Aerotec continues it right to the tramsom which reduces lift... and hence speed... compared to a design that flatten towards the transom.

The ultimate speed of mine is also somewhat reduced being in modest old guy grey.

Probably the first to the chip shop would be if someone came along with an F-rib which are not too deep V and fairly flat at the transom plus being GRP hulls lose that ... however small... flex nature of an inflated "rubber" floor which can lose speed.
Attached Thumbnails
Click image for larger version

Name:	New Bombard Aertotec.jpg
Views:	62
Size:	134.0 KB
ID:	111041  
__________________
Fenlander is offline   Reply With Quote
Old 03 March 2016, 09:51   #65
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 3,573
just read Suzuki have brought out 4,5,6 hp 23.5 kg motors that can be stored on the front starboard and port sides be good if the 20 was the same David

cheers
__________________
jeffstevens763@g is offline   Reply With Quote
Old 08 March 2016, 09:58   #66
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 3,573
just ran my 25 hp Suzuki engine up took fuel line off engine left ticking over 220 - 210 rpm ran for 21 mins till empty for info.

cheers
__________________
jeffstevens763@g is offline   Reply With Quote
Old 08 March 2016, 11:58   #67
Member
 
Country: UK - England
Town: East Anglia
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Suzuki DF20 EFI
Join Date: Nov 2007
Posts: 3,276
I guess you mean an idle around 710rpm??

Anyway it's virtually running on fresh air at idle from the sound of it?

From what I can see around the net the fuel consumption of a 4-stroke might be 20-30% better than a 2-stroke of the same power in normal running but on the 20hp Suzuki supply a tank half the size of my existing Mercury 15. Might have to get a larger one.
__________________
Fenlander is offline   Reply With Quote
Old 08 March 2016, 12:06   #68
Member
 
Country: UK - England
Town: Sussex
Boat name: Bombard, Y-162
Make: Aerotec 380, Y-Class
Length: 3m +
Engine: Mercury Mariner 15hp
Join Date: Jul 2010
Posts: 2,692
Fenlander is right re' the draggy hull - in my experience too. My 3.4m Zodiac Fastroller (flat type SIB bottom) with a 9.8 was faster than our Aerotec with a 15. BUT it's a bit like the old Landy saying - "You go fast, I'll go anywhere" or more suitably: "You go fast (on flat water) I'll go out in the bigger stuff and if you dare then I'll be faster" or something like that...
__________________
Max... is offline   Reply With Quote
Old 08 March 2016, 12:13   #69
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 3,573
Quote:
Originally Posted by Fenlander View Post
I guess you mean an idle around 710rpm??

Anyway it's virtually running on fresh air at idle from the sound of it?

From what I can see around the net the fuel consumption of a 4-stroke might be 20-30% better than a 2-stroke of the same power in normal running but on the 20hp Suzuki supply a tank half the size of my existing Mercury 15. Might have to get a larger one.
showing 220 on the rev counter didn't seem right was going to have a look in the manual but it's certantly low reving and very quite but suspecting the 10 rev counter not a true read out.
I think you will be surprised at the fuel consumption when you get yours.
Should be 850+or-
Cheers
__________________
jeffstevens763@g is offline   Reply With Quote
Old 09 March 2016, 03:07   #70
Member
 
Stigomery's Avatar
 
Country: UK - England
Town: Cambridge
Boat name: SIBylle
Make: Honda Honwave
Length: 3m +
Engine: Honda BF20
MMSI: 235915576
Join Date: Oct 2015
Posts: 407
Quote:
Originally Posted by jeffstevens763@g View Post
showing 220 on the rev counter didn't seem right was going to have a look in the manual but it's certantly low reving and very quite but suspecting the 10 rev counter not a true read out.
I think you will be surprised at the fuel consumption when you get yours.
Should be 850+or-
Cheers
There's another thread on these cheap tachs... I have one... when it registered 2946 as the WOT RPM Poly pointed out that my low idle revs of around 300 were probably 50% of what i was actually doing, ditto at WOT... perhaps your tach is like mine and reading 50% of actual.
__________________

__________________
Stigomery 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 21:54.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.