Whip 20 Help me break 70mph

[kevinpratt823]

Whip 20, Neu 1515/1Y, SK180, 4s2p(5000mah each) Dinogy.
I got 64.6 with an ABC H7, 67.4 with an Octura 1650, temps still reasonable after 4 min. And I'm looking to break 70mph before winter comes here.

ABC H10 out of stock everywhere, any recomendations? Preferably something available on OSE.

I'm not extremely familiar with hydro props yet............and I know I can prob get another couple mph as dial setup also.
Thanks for any experienced input!

[Shooter]

Awesome quest!! Just my opinion, but you may be close to the limit with those props, unless you don't mind reducing run-time. I was running an M545 with the same esc/motor in my stealth, but I could run it till the batts dumped with no temp issues.

If it's just speed you are interested in, removing the turn fin is good for ~2mph. Also, have you considered some smaller diameter, higher pitch SAW props? They may require a hand launch.

Good Luck!!!

[kevinpratt823]

Awesome quest!! Just my opinion, but you may be close to the limit with those props, unless you don't mind reducing run-time. I was running an M545 with the same esc/motor in my stealth, but I could run it till the batts dumped with no temp issues.

If it's just speed you are interested in, removing the turn fin is good for ~2mph. Also, have you considered some smaller diameter, higher pitch SAW props? They may require a hand launch.

Good Luck!!!

Not sure I can keep it on the water without the turn fin, I don't get many totally still glass-water days at the pond I go to. I'm not too concerned with runtime if I can break 70mph. Once I do it I'll prob go back to the H7 for most regular running.........
I wouldn't know where to begin with SAW props. I do have a 1745/3 back-cut/cupped tips, and a 2047 back-cut(both were some of my early attempts at modding props) from experimenting with SAW runs in my old UL-1 though, thought about trying those......
Thanks for the feedback, anyone else?

[Heaving Earth]

Have you considered 5s?

[Heaving Earth]

Wait, I think I remember it won't fit 5s packs

[785boats]

As strange as it might sound, the H-5 gets me more speed than the H-7 on my 33" Whiplash with the same KV motor as yours. It allows the motor to rev higher. I'm not saying it will do the same on yours, but it might be worth a try. A Prather S225 also works well in that rev range.

[kevinpratt823]

As strange as it might sound, the H-5 gets me more speed than the H-7 on my 33" Whiplash with the same KV motor as yours. It allows the motor to rev higher. I'm not saying it will do the same on yours, but it might be worth a try. A Prather S225 also works well in that rev range.

What batt setup do you use, mine is a bit heavy with 5000's. I do have an H6 that I haven't even tried though.

And Dana, (2) 5s won't fit, I though about trying one though, but the COG will prob be too far back.

[Fluid]

You could run 5S1P and use lead to get the right CG position. Weight can be your friend when trying for high speeds in an air compression hull. Other props to try would be the ABC 1718 (for 5S) or the ABC 1716 (4S). They may unload a bit more than the elephant-ear props.


.

[785boats]

What batt setup do you use, mine is a bit heavy with 5000's.

Here in Australia we can only run single packs for racing so it's a 5000mah 40C pack in mine. As Jay said, weight is a good thing. I need to run 280grams of lead in the front of mine to keep it on the water. It's going nowhere near 70mph either.

[kevinpratt823]

ABC H-10 back in stock, just ordered thet and a 1716. Wish me luck! I'd really like to do it on 4s, putting 5s in would feel like cheating, plus that's higher than I like to go for rpm's.

[kevinpratt823]

First tries with the 1716 got 60 mph, and very slow to get on plane, and 65 mph with an H-10, still kinda slow to plane, so far my best was still the 67.4 mph with the Octura 1650, but I'll try the others again today with a bit of strut adjustment..........

[detox]

First tries with the 1716 got 60 mph, and very slow to get on plane, and 65 mph with an H-10, still kinda slow to plane, so far my best was still the 67.4 mph with the Octura 1650, but I'll try the others again today with a bit of strut adjustment..........

Add a little cup at tips to your 1650. Bend/twist toward center of hub and upward at tips about 1/64-1/32". Regular pliars will work for this.

[kevinpratt823]

Add a little cup at tips to your 1650. Bend/twist toward center of hub and upward at tips about 1/64-1/32". Regular pliars will work for this.

Funny, just got back from the pond and I cupped it a bit before I even ran it, hadn't even read this yet. I also drilled a hole in the strut bracket, which was for a mono, to bring the strut(sport 20 extended type) back in to the transom. Ran good for a minute, until it filled up with water from a water line that came free on the esc. Brought it back in and the GPS wouldn't come to life. Hopefully try again tomorrow........
My 1650 is back-cut a bit also, I may get another raw one to start from scratch with.

[Kris Flynn]

Revs are your friend :)

On 4s1p the hull can do 92mph+ average both ways through the traps

[kevinpratt823]

Revs are your friend :)

On 4s1p the hull can do 92mph+ average both ways through the traps

I thought I had read that somewhere........
Any tips on what direction to go for me?