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!

Closed Captions (CC):
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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