Propeller
Performance Testimonial
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Graham Cox is a long time member of the OBC in Orakei and a long
time customer of Ovlov Marine. Ovlov Marine sold him his original 200hp
duo prop for his Vindex 350 and then re powered it a decade later with a
KAD42. He then brought a Sea Ray 39 and uses it regularly to commute to
the bottom of Waiheke and for cruising.
The Sea Ray was powered by 2 x 2.7L 350hp big block V8s (not Volvo
Penta engines). Ovlov Marine discussed re powering with diesels for the
last 5 years and in the end Graham found the V8s to be too unreliable.
After the last breakdown in November Graham looked at the reliability
and exorbitant fuel costs and took the bold decision to re power. all
options were looked at, particularly his required cruising speed of
20-22 knots.
The V8s had a top speed of 24 knots and you probably could not guess
how much fuel was burnt! the D4-300 HS63 2.04:1 engines and gearboxes
were selected on the basis that they would fit comfortably in the hole,
and on calculations by Mark Power at Henleys Propellers that they could
reach 25 knots and cruise at 18-19 knots. Final sea trials showed a top
speed of 25.4 knots with an average up and down wind of 24.5 knots with
max revs of spot on 3500. Cruising at 3000 revs gives 21 knots @1.89
L/NM per engine.
Graham is very pleased with these figures and is particularly
impressed with the quietness of the engines. He had always believed
that diesels were noisier than petrol engines, but has been pleasantly
surprised. He is also impressed with the torque of the engines, ( this
torque gives the excellent cruising speed ) and the smoothness of the
installation and the Henley 4 blade
'Black Tip' propellers.
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To
sum things up, I am impressed! You said that I would get improvements in
speed and vibration mid-range and top end and I am happy to report that
I have seen improvements right across the speed range. I picked 2.4
knots at my cruise speed and vibration was reduced by up to 40%, plus at
the top end I got another 1.7 knots. The Stainless Steel
"Wahoo" propellers
I fitted to my Riviera 4000 Offshore had improved the boat so markedly
that family and friends have commented on how much smoother the boat now
feels. I would have no problem recommending these propellers to any of
my boat-owning friends and will specify them as standard on any future
boat purchases!!
The top end speed is
exactly as the calculations predicted and these propellers have markedly
more "bite" when manoeuvring than the ones I replaced, even in reverse.
As a result, the boat runs better, cruises faster with less vibration
and gets on plane 200 rpm earlier, a real bonus when cruising offshore
in a decent swell.
Once again thanks to
Henleys Propellers and to Twin Disc Pacific for getting it right first time and giving me the extra
performance without the shake!.
Richard Tamba,
Australia
Owner of Riviera 4000 Offshore "Nauti"
11 August 2003 |
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Launch went well yesterday, we had the
Coastguard vessel next to us and they were going about 1 knot faster at
28 knots, then our engineer advised a short burst at wide open throttle.
Although the electronics had not been commissioned, we estimate approx
28-29 knots. The square planing board at the stern was actually on top
of the water due to our very light load. There was no prop aeration at
all which can sometimes happen with this hull shape as they are
reasonably close to the surface.
If
I can offer some advise, when choosing propellers, do not just get the
cheap ones, both the Ferry and our Alaskan 41 have gone for specific
propellers from Henleys in New Zealand, who are the experts in this type
of full displacement hull shape. We work closely with Twin Disc who are
their Australian agents.
Rob Shenn
Shcioning
Marine
19 January 06 |
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"Several of our clients have
now invested in Tiger Props, typically improving speeds across the range
by 1.5 to 2 knots. With this performance we have decided to fit the
Tiger Props as standard on all new contracts."
George Oliver,
Oliver Boat Builders
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" Wherever possible we prefer to use Henleys Propellers as we have a lot of confidence in their product. We generally use Henleys Propellers on most of the boats we design for Australia and boats which are built in Asia. Henleys supply a good product and understand our vessels and how they perform which is critical to propeller design."
Andrew Tuite,
Crowther Design, Australia
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"We have found the tiger
Propellers offer significant improvement over the conventional styles
available in the past in smoothness, speed and economy."
Grant
Senior,
Formula Boats
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"Naiad has designed and
developed twin diesel shaft driven rigid hulled inflatables using complete
Henleys drive lines. Each time Henleys speed predictions and prop selection
have been accurate. It is most pleasurable when things go this well."
Steven
Schmidt,
Naiad Inflatables
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"Henleys suggested four blade
Tigers be fitted to our new Genesis 400 Targa, they were right on the
button. Better than predicted top end speed (33knts), really efficient and
smooth through to mid range cruise."
Chris Pollock,
Genesis Marine
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"On fitting tiger Props to our
planing launch we experienced a 2 knot speed increase through out the
engines RPM range. Manoeuvrability was significantly improved."
Tony Hembrow,
Rayglass Boats
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"We encourage our owners to fit
Tiger Props on our range of power and motor sailing catamarans as they
improve performance and economy."
Peter Brady,
Brady Marine Associates,
Queensland, Australia
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"Its been four years since Salthouse
Marine changed to Henleys propellers exclusively. We were looking at
reducing noise and vibrations caused by propeller wash, as well as improving
performance and product consistency. The team at Henleys are great to work
with and have been extremely helpful in developing and improving our
product. Our results show their ability to work with us to get the best
result."
Rob
Salthouse,
Salthouse Marine Group |
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"I am basically positive to work together
with Henleys Propellers to solve any problem as we know Henleys to be a
very good propeller company."
Sune
Ehrenskjold,
Gori Propeller
Denmark
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"On trialing Tiger Props on our new
high speed planing cats we found significant speed increases, smoothness and
manoeuvrability over a locally imported brand of propellers."
Guy O'Brien,
Cougar Cats,
Queensland Australia
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"On replacing the standard
propellers supplied with Tiger Propellers the vessel experienced a 2 to
2.5 knots speed gain & extremely smooth running"
Lance Howse,
'Revelry' Riviera 38
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"Henleys Propellers
totally changed our boat. With a 2 knot gain and total elimination of all
vibration and noise previously experienced.
Simon
Davidson,
Skipper, MY 'Krisujen'
58' Huckins Motoryacht
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"On fitting Tiger Propellers to
our latest Millennium design vessel the difference factor has been
extremely smooth running."
Dave Duke,
Regal Boats
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"On fitting 2 x 26" 4 blade Tigers to my new
Warwick 16 metre vessel we achieved a speed gain on the measured mile of
3.4 knots. As you can imagine I'm absolutely rapt."
J S Ford,
Vessel "Blue Waterford"
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"Tiger Propellers sell
themselves. My customers now demand them. Their reputation for quieter and
smoother running is to be believed."
Duthie Lidgard,
Lidgard Boat Builders
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"SkipJack
Propeller" Just a note to say thank
you for your prompt efficient service, the propeller fitted perfectly onto
the shaft and we are extremely happy with the performance it provides. We
can now comfortably reach hull speed with a power to spare. Sailing
performance is greatly improved with not noticeable effect of drag.
Robert
Slotemaker
Market Services
Coordinator
New Zealand King Salmon Co
Ltd
Nelson
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"These excellent
testimonials on the performance of Henleys custom built propellers
prove that our position as an industry leader in our field remains
unaltered." |
