Which Propeller has the best output, in this video I find out. Late 2019 I brought a new Tohatsu 9.8hp 2 stroke engine for my dingy. It came with no spare parts so while in Europe I ordered amount other things a spare propeller. I ordered it in a slightly different dimension than the original so decided to find out which was more suited to our situation. We did some back to back timed tests and ended up with a pretty accurate if unscientific result.
Enjoy!
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good morning everyone welcome to another
episode of learning by doing
Marie back here and I are still up in
wag in West Papua and I hope that the
world is still going on we've been off
offline now for a couple of weeks and
away from the whole corona thing so we
don't really know what's going on but
that suits us pretty well we're not
bored and we're both healthy and
everything's good so there's that anyway
today I want to do an episode about my
new to hatsue outboard engine I bought
this at the end of last season because
my old Yamaha 8 just had too many things
wrong and just kept breaking and the the
chassis itself was cracking and
something in the carburetor broke and I
woulda had to get a new carburetor and I
just got sick of fixing it to be honest
so I ordered one of these and the same
weight as the as the Yamaha but slightly
more power so I thought that would be a
good thing because Murray was coming
would have more weight in the dingy so
when I bought the engine didn't have any
spare parts were there anybody who who
sails around in coral areas know that
sooner or later you're going to hit
something hard with your prop so I
ordered a spare prop for this engine and
impeller and water pump and things like
that and whatever spares I needed but
instead of getting the same prop that
came with it I decided to get a
different prop and I did a little bit of
research and I ordered a slightly bigger
prop with slightly less pitch I think
and so I want to do a test now between
the original prop and then I've got
little wings that that go on the side
and then the bigger prop so I want to do
three tests maybe four if it all works
out
the test will be two basically I'll do
it old-time it
standing start wide open throttle I'll
time it to get on the plane and then to
get to top speed and I'll do them side
by side and then he'll can do a bit of a
result and see which is the best one
anyway
Murray will be helping mirror this she's
my timer and ballast because it has to
be a realistic test of how the weight we
would normally use in the dinghy so
we'll do a few of that now film it with
the drone and we'll see here we go
enjoy
okay so this is a standard prop that
came with the up board with this one
with both our weights in it and a full
fuel tank
we got 16.7 knots
top speed and 8.7 two seconds from 0 to
planing this is a new prop that I bought
back looks pretty similar but it's
actually quite different so I'll give
this one a crack it's definitely bigger
because it only just fits in between
here so quickly stuff this one on and do
the same exact test and compare notes
okay as you can see this prop does make
a difference it's sort of what I
expected actually so from a standing
from zero to plane was eight point zero
five seconds and the top speed was
fifteen point seven so with this prop we
get up on the plane nearly it's
three-quarters of a second faster but we
lose one knot of stop speed but that's
good because that's sort of what I
thought we get nearly more talk as such
the heavier the dinghy will get up on
the plane faster so now we're going to
try and put these these wings on these
came off my eight horsepower Yamaha and
I've killed the holes in here already
I'm going to screw them on and we'll see
what difference these make
okay with that
despair prop and the wings we got 0-2
plain of 7.9 three and a top speed of
twelve point seven so obviously a big
reduction in top speed and a slight very
slight better result for getting on the
plane but yeah different than I thought
I thought would have got up on the plane
a lot quicker okay as a final test I'm
going to take this prop off and put the
original one back on and leave the wings
on
okay so that was the fourth test we're
very scientific here at the beach so
I'll give you the results first so this
is the standard prop with the wings zero
two planning 6.9 seconds top speed
thirteen point nine knots so in
conclusion this is the best combination
without the wings this was eight point
seven two seconds to plane so that's two
seconds slower than with the wings the
top speed was thirteen point nine with
the wings and without the wings sixteen
point seven so nearly three knots slower
but two seconds faster on the plane and
I think getting faster on the plane will
mean that we can put more weight in the
dinghy because sometimes when it's me
and Murray and all our camera gear and
some dive stuff we just can't quite get
on the plane and I think I think with
the wings it'll just give it that extra
bit of lift so yeah pretty interesting a
few seconds and a few knots of speed
here and there not a huge amount but
still we're talking 20 30 % which is
which is quite a bit in the end anyway I
hope you enjoyed that and can find it
some find some use in that Cheers
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