50" Hydro Build

[Make-a-Wake]

I'm not even sure where to start with props? Any ideas?

Did you check out that thread of the 1/8 Miller areomarine i posted earlier? Bill went thru alot of experimenting...........but i think he was running a Neu 1527.

Based on the 144a average draw, i should spin the 67mm 3 blader no problem. May try a Prather 275 and an Octura 470/3..............may just order them together...........

[TotalPackage]

That big thing runs good. If you only drawing 144 amps thats sick.

[Make-a-Wake]

Thats what you're drawing, obviously there is an efficiency issue to consider, some of that is used to keep your electronics nice and warm 1HP is 746 watts, but I always figure for every 1000watts I draw I make 1HP...I could be off though, I like to figure things on teh lower end in case the HP police come asking for proof...

Keep in mind that is an average too. There are surely highs and lows above and below that. How did everything do temp wise this time?

Temps were good..................the dual intake system works better.

So based on the 144a average, it may have been 200 in the straights for example?

[Make-a-Wake]

Headin' out again in the AM for a GPS run on some glass.......i'll be movin down the lake for some long straightaway runs! Vid of course...............

[chummer]

Gotta subscribe to this one!!!

Very nice, can't wait to see what your final results are with this baby. These Castle motors keep on amazing me.

[martno1fan]

She looks really good,try the 6717/3 from propshop.I got mine balanced and sharpend from dasboata and that prop was by far the best on my gas hydro,she topped out at 69 mph with that prop with a 6+ hp zenoah.You need alifting prop,the 270 is probably a better mono prop but the 6717/3 has the lift needed to get the rear end up and keep the nose down.
Mart

[Make-a-Wake]

New Vid of some long WOT runs, GPS reading at end of vid.

Great closeups starting at 1:00, shows how it rides. I think i'm gonna run 10s2p next. Temps were 117* motor, and 138* ESC, run was 2 1/2 minutes, vid was shortened to spare you of more laps.

Really pleased with this boat, its fairly bulletproof with the 1/4" drive, and sturdy motor mount......plus the new strut with extra bolt to prevent it "caving" in again.

Vid:

[keithbradley]

Beautiful!

Bring on 10s!

[Make-a-Wake]

Hey Keith, average amp draw with the long straights in the run was 185a with your formula......guess i'm puttin' out closer to 8 horse...............i still have a little room left with the SF240hv and good temps...................10s is looking better and better............hmmmm

[martno1fan]

Yes shes getting there,but your prop isnt lifting the rear end enough.She should be running on the prop and shes not which is why i suggested the 6717/3 which should provide you with the lift your not getting from the 270.Use the stock prop not one with rounded tips as the tips are what give the lift.Once shes riding on the prop you will see a big increase in speed.If you have 10 hp you should see well over 60 mph,i hit high 60s in a 18lb t boat with 6+ hp.You dont need more power you need the right prop .
Mart

[chummer]

Lookin' good, still looks like it's capable of more though.

I would take the advice of martno1fan. Try a different prop. That prather 270 is a good prop but I think it would work better on a mono.

I don't know the first thing about Hydro's other than what I have read on OSE but it just does not look like it's running smooth enough yet. I think there is more speed and handling to be found in that setup.

Keep at it, your doing great.

[Brushless55]

man that thing sounds and looks so smoooth!!
10s2p with lifter prop I bet 70's

so on 10,000mah what would be the average runtimes
reason for the question, I would love to run a whip with this motor against the gas guys this year at NAMBA20

[martno1fan]

Actually i think that boat with that setup is capable of mid to high 60s with just one change,the prop.6717/3 is a great prop,6719/3 also is a great sports hydro prop which might suit your 10 hp even better.
Mart

[Make-a-Wake]

Thanks guys! I got my 1/4 to 3/16 reduction shaft in from aeromarine so i have the option of other props that need a 3/16. I have a 1460 that i bought for a 3/16.........i'll give it a shot next on 10s....should be better when upping the voltage and give it a bit more lift. I can also give the other prop suggested by martno a shot......cant find it though on OSE, got a link anyone?

Here's a pic of it running by on the closer straightaway........looks pretty good to me........i had to do it the redneck way by taking a pic of the computer screen....LOL

Brushless, i estimate about 4 - 4 1/2 minute runtime on 10,000..............

[Make-a-Wake]

What about this prop..........it may work well

http://www.offshoreelectrics.com/pro...od=dh-aqub9787