Scale Hydro Prop Recommendations

[JLG627]

I've got a 25in. scale hydro with a Neu 1521/1D and Castle Hydra 240HV running on 6s lipo and am wondering what prop(s) to go with for such a hot setup on such a light boat. I have just finished puting together this project and have not yet run the boat so I have no Idea what prop(s) to run with. Any info anyone could give would be a big help!

JLG627

[Raydee]

6s Lipo on a 25" boat is crazy. Start with a Octura 35mm or 36mm I guess.

[JimClark]

that setup will probably be balisitc why 6s in such a small boat 4s would probably work great

jim

[AntronX]

1521 1D (2900 Kv) will be destroyed on 6S. That's about 65,000 rpm unloaded at this voltage, the magnets will fly off. You should not run more than 4S LiPo. Castle 240HV is overkill. Regular 240 will do fine on 6S.

25" is 1/12 scale boat. That's like my Miss Llumar RTR Hydro. The hull is not made for this kind of power. It will be too heavy and will crash from too much speed.

If you still want to proceed with this ridiculous setup, try Octura X437 balanced and sharpened. Buy one already balanced.

Please post video of your first (and only) run. I would love to see it.

[JLG627]

Prop Guesses

If I stepped down from 6s to 5s with the 1D motor (53,600RPM), would any of the following props work well?: X440/3, X642, P741/4, V940/3, V942/3, 1.6/3? If not, what props would work well with a 1521/1D 5s setup?

JLG627

[Dr. Jet]

4S will be more than impressive. Try to shoot for 30~35K rpm at the prop. 54K will give you nothing but headaches.

[ReddyWatts]

Start with a X437 prop on 4s. Hope the hull will handle it? Make sure it is water tight, may end upside down. You may go in shock when you see it run.

[JimClark]

my guess is 50++++++ if you can keep it on the water

[AntronX]

At what capacity (mAH) you batteries are rated?

[JLG627]

Get Me To Sixty

I guess what I'm trying to say is, I want to see 60-65mph out of this little rocket and I want to know what prop(s) will get me there.

JLG627

[Ub Hauled]

I guess what I'm trying to say is, I want to see 60-65mph out of this little rocket and I want to know what prop(s) will get me there.
JLG627

Going that fast on a hull that small will give you straight lines only... you will not be
able to turn... also, you may wanna consider a bigger hull if you really wanna use 6s or 5s... there is a lot of weight that will be traveling and it actually may not even fit inside.
it wold be a nice idea to work the sponsons and place an air dam so you can stay in the water right side up. OR you can use 4s1p

Just a thought....

[JLG627]

I havn't actually purchased any batteries yet, but was planning on going with an 8000mah capacity lipo setup because of the power hungry nature of the 1521/1D motor.

JLG627

[Ub Hauled]

Can you post pics of you boat Chuck? I am curious to see what you are turning in to a missile.

[JLG627]

Unfortunately, my computer is completely trashed when it comes to emailing or posting pictures. I havn't been able to electronically send pictures forever and it's really frustrating because I miss being able to share things with family and friends. Being unemployed right now really, really sucks. I can't afford to have my computer fixed and I can't finish my boat projects, so all I can do is gather as much info from the pros as I can and continue to lay out plans. I can tell you this though, the hydro is a vintage MRP Miss Budweiser that I got still wrapped in protective plastic in the original box in kit form from the early 90's that I miraculously found on ebay back in May. I had this same exact boat when I was 13 years old and I tried to modify it back then with my thirteen year-old brain and the parts available at the time and the project literally disintigrated on me. It was a complete disaster! So I guess you could say this second and final attempt to appease a childhood dream turned disaster has turned into a lust for success! I am so totally infatuated with the hobby of fast electric boating that I can't sleep some nights and I think my passion for the hobby gets me to thinking that "It's Never Fast Enough"!!!

JLG627
(Chuck)

[Scott T]

Chuck, that Neu will probably tear the Miss Bud in half - it would be a real shame to do something like that to such a cool boat.

I still think you should go for a nice 2S2P setup, or an SV27 combo on 4S1P, as I recommended in your last thread.

That boat was never designed or manufactured to handle 50 - 60 mph. You could probably get into the 40s, and it would be one of the sweetest looking boats on the pond.

SCott