I also have the original Martec Eliptic on my 38-3. No vibration, hull speed at
2400 RPM, and in reverse, you have to think ahead.
To align the blade, I installed a cheap fleabay car backup camera connected to
the video input of my chartplotter (Zeus Touch). With paint mark on the tranny
and cuppling, easy to align. It also give me view on the engine, stuffing box
and bilge when motoring for prolonged period.
Pierre TremblayAvalanche #54988
C&C38-3 WK, hull #76
Le vendredi, 16 février 2018 11:53:09 Est, Gary Russell via
CnC-List <cnc-list@cnc-list.com> a écrit :
I have to provide the dissenting opinion on the Martec prop. Many years ago,
I had to make a quick stop when two kids in a dinghy came out of a mooring
field in front of me. In order not to hit them I slammed the boat in reverse.
Being not geared, one of the blades did not open. The resulting imbalance (
at full power) bent the shaft severely. The resulting 1/2" run out created
incredible vibration. The shaft and prop had to be removed for repair. I
would never use a folding prop that isn't geared. I currently use a 3 blade
Flex-O-Fold prop which has very good reviews and I'm happy with it.
GaryS/V Kaylarah'90 C&C 37+East Greenwich, RI, USA
~~~~~~~_/)~~~~~~
On Fri, Feb 16, 2018 at 9:54 AM, Dreuge via CnC-List <cnc-list@cnc-list.com>
wrote:
My LF38 came with a 2 blade Martec Eliptec (LH18DX14P-3 1-1/8), and I agree
with others that the performance is surprising good. Yes I often
forget/neglect to align the blades, and I have experienced the boat shake on a
rare occasions. Performance wise, forward to hull speed is no problem in flat
water, but like others, I cruise at about 6.5 with a lower rpm (Yanmar
3QM30/Paragon/Walter-Vee). With regards to backing/stopping, I have not hit
anything (harder than willing) yet. I do get some starboard prop walk which I
try to take advantage of, but it is nothing compared to the walk of my old
29Mk1 w/ a fixed 2 bladed prop.
-
Paul E.1981 C&C 38 Landfall
S/V Johanna Rose
Fort Walton Beach, FL
http://svjohannarose.blogspot. com/
On Feb 15, 2018, at 10:32 PM, cnc-list-requ...@cnc-list.com wrote:
My Martec runs very smoothly with a couple small harmonics at different
rpm's. That's normal for nearly all drive trains.
Forward power is good. I think my prop is a wee bit underpitched. I can
get hull speed with a clean bottom and max rpm but only 6.4-6.5 at cruise
rpm (80% max).
I really haven't had any issue with opening, closing, etc. I think the
Martec is a good choice for folks who race and want minimal drag. If my
use was only cruising, I'd probably have a different prop.
Dennis C.
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every one is greatly appreciated. If you want to support the list - use PayPal
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_______________________________________________
Thanks everyone for supporting this list with your contributions. Each and
every one is greatly appreciated. If you want to support the list - use PayPal
to send contribution -- https://www.paypal.me/stumurray
