power choices

[urbs00007]

I am currently building a wood sport hydro of my own design. It will be about 48" long overall with a 12" hull width. Lots of room. My power system choices are a single TP 5670 840kv with swordfish 300, or twin neu 1527 2300 kv with castle 240's. looking for a quick boat with reasonable runtime. I have (4) 5000ma 5s revo's 70c 420 graphenes. So its the neu's on 5s 10,000ma or single TP 10s 10,000ma. which one? thanks in advance for your help.

[Fluid]

First, I assume the 12” width is for the tub, not the total hull width. Do you intend to race the boat? What do quick and reasonable mean to you?

The simplest route is the single motor, lots of proven setups posted over the years. The Kv of the Neu motors is too high for 5S, the props will be too small and rpm too high. Motors with a Kv closer to 1500 would likely perform better on 5S in this large heavy hull, with a reasonable rpm and larger, more efficient props.

Or, use motors with a Kv around 800 and wire 10S to each. More costly due to the need for two HV controllers though.


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[urbs00007]

First, I assume the 12” width is for the tub, not the total hull width. Do you intend to race the boat? What do quick and reasonable mean to you?

The simplest route is the single motor, lots of proven setups posted over the years. The Kv of the Neu motors is too high for 5S, the props will be too small and rpm too high. Motors with a Kv closer to 1500 would likely perform better on 5S in this large heavy hull, with a reasonable rpm and larger, more efficient props.

Or, use motors with a Kv around 800 and wire 10S to each. More costly due to the need for two HV controllers though.


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thanks fluid. kinda thought that. any prop suggestions for the TP?

[CircusCircus]

Single TP setup will work....your NEUs are to hi KV and wont work......also hydros dont run twin motors.....try a prop with a diameter around 55mm like a Octura x457/3 blade.

[Bp9145]

Single TP setup will work....your NEUs are to hi KV and wont work......also hydros dont run twin motors.....try a prop with a diameter around 55mm like a Octura x457/3 blade.

HUH?? I think you are mistaken, hydros defintely can run on a twin setup which means two motors. . .

[Fluid]

Full-scale drag hydros run twin prop shafts, and even some Unlimited hydros ran multiple motors. Gas and nitro hydros run twin motors. The NAMBA rules allow twin motors in FE Hydros, just because it is seldom done doesn’t mean it can’t work.


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[martin]

Yes there are plenty of twin nitro hydros in .21, .45, .67 & .90 capacity over on International Waters RC, twin hydros are very popular.

[Bp9145]

Full-scale drag hydros run twin prop shafts, and even some Unlimited hydros ran multiple motors. Gas and nitro hydros run twin motors. The NAMBA rules allow twin motors in FE Hydros, just because it is seldom done doesn’t mean it can’t work.


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thank you. ..lol

[urbs00007]

First, I assume the 12” width is for the tub, not the total hull width. Do you intend to race the boat? What do quick and reasonable mean to you?

The simplest route is the single motor, lots of proven setups posted over the years. The Kv of the Neu motors is too high for 5S, the props will be too small and rpm too high. Motors with a Kv closer to 1500 would likely perform better on 5S in this large heavy hull, with a reasonable rpm and larger, more efficient props.

Or, use motors with a Kv around 800 and wire 10S to each. More costly due to the need for two HV controllers though.


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jay, what if I traded or sold my neus and bought 2 motors to run with my castle 240's. if so, what motors , lets say T P would you recommend. twins sure sound cool. would run both normal rotation, of course.

[Fluid]

Realize that the following is pure conjecture, I’m not aware of anyone who has used a pair of powerful motors in such a large sport boat. This means there is risk being a pioneer of such a setup, while the single motor option is proven with lots of experience available.

But if I was limited to the Castle 240s and 5S packs I’d try the TP4070/1520 Kv motors on 5S. I’d start with x450 props, they should be conservative with speeds in the upper 50s. You may be able to move up to ABC 2215 for speeds well into the 60s. But of course I don’t know the amp draws for certain so run times are unknown. Assuming an average of 200 amps per motor and 10,000 mAh capacity means a safe run time of about 2.5 minutes.

The above assumes a well designed and trimmed hydro. Stuck down tight the amp draw would be high. Lots of on and off throttle on small water will heat things up too.


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[urbs00007]

Realize that the following is pure conjecture, I’m not aware of anyone who has used a pair of powerful motors in such a large sport boat. This means there is risk being a pioneer of such a setup, while the single motor option is proven with lots of experience available.

But if I was limited to the Castle 240s and 5S packs I’d try the TP4070/1520 Kv motors on 5S. I’d start with x450 props, they should be conservative with speeds in the upper 50s. You may be able to move up to ABC 2215 for speeds well into the 60s. But of course I don’t know the amp draws for certain so run times are unknown. Assuming an average of 200 amps per motor and 10,000 mAh capacity means a safe run time of about 2.5 minutes.

The above assumes a well designed and trimmed hydro. Stuck down tight the amp draw would be high. Lots of on and off throttle on small water will heat things up too.


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thanks for your opinion, jay. what could I expect with the single TP motor? just a guess, of course.

[Fluid]

The single-motored 10S sport boats I’ve seen were high 60s to 70s, although they used Lehner or Neu motors. Like all FE boats, the faster you go the less time you have to do it. The TP motors I’ve seen or used in the past few years have been well made and performed well, but all were 40-sized motors.

I asked earlier if you intended to race the boat. If you do, the single motor setup would be better. It depends on how you read the NAMBA rules, but twins may not be allowed like they are in Hydros and monos. Regardless, the simpler single drive is probably best.


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[urbs00007]

The single-motored 10S sport boats I’ve seen were high 60s to 70s, although they used Lehner or Neu motors. Like all FE boats, the faster you go the less time you have to do it. The TP motors I’ve seen or used in the past few years have been well made and performed well, but all were 40-sized motors.

I asked earlier if you intended to race the boat. If you do, the single motor setup would be better. It depends on how you read the NAMBA rules, but twins may not be allowed like they are in Hydros and monos. Regardless, the simpler single drive is probably best.


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single it is. thanks fluid.

[rol243]

yes its definetly more popular to run twins in other hulls such as cats / monos and riggers as opposed to the sport hydro.

[Bp9145]

Single TP setup will work....your NEUs are to hi KV and wont work......also hydros dont run twin motors.....try a prop with a diameter around 55mm like a Octura x457/3 blade.

even riggers can have twin motors. . .here you go https://www.youtube.com/watch?v=mxRWXDSbB5E