Important Questions

[Flying Scotsman]

4S lipo and a Neu 1521 for a 39" hull??? Guy's is there something I am missing here??

Just voltage . He has not stated his end voltage as of this date

Douggie

[ED66677]

6S would be better for a 39" hull!

[txboatpilot]

I run a 40" Insane Cat, on 8S2P and 10S2P.. Speeds range from 40-45mph on 8S and 55-60mph on 10S....

Does anyone here, have any video or data on large 39"+ hulls running on 4S or 6S??


Any pictures of the 39" hull??

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Sorry guys, I meant that I was looking at a pair of 4s batteries; I doubt a single 8s or 10s battery will fit under the lid, so I was looking at a pair of 4s batteries (the SMC's obviously aren't enough)

Hull's nearly done, needs another epoxy layer and it should be ready. On exam leave until Monday, so I'll upload photos relatively soon :)

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Guys, I intend on running 8s Lipo, but the Hydra 120/240 doesn't allow this, so I have to use the HV version. Or, can I run 8s and a seperate BEC with the Hydra 240?

[tth]

the Hydra low voltage series will not handle 8s. You will need to get a HV esc.

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Ok guys, I've ordered:

CC 120HV Hydra ESC
Neu 1521/1Y 1577KV 8mm Shaft
OSE 8mm Straight Couplers for .187 cable - Out of Stock, will make my own on the lathe
Hughey .187 Assembled Cable for 3/16" Propellers
Teflon Liner for .187 flex cable
9/32 brass for Octura .187 Teflon tubing
Speedmaster Stinger Strut for 3/16" prop
Speedmaster 21 Rudder 5.25" Long Mono Rudder
Octura x447 Prop 3/16"


Hopefully the Hydra will be okay with this setup, I've calculated that the Motor will draw 118 Amps max on this motor. I'm going to only use this in this hull once or twice quite lightly just in case though. Then it will be going in a smaller/lighter hull.

[Meniscus]

If your calculations come up to 118 amps, I would be very cautious. Consider starting with a smaller prop and record the amp draw on the system. Others will record temperatures, which I would do anyway. This way, you don't cook an ESC that is not easily replaced due to funds. Just my thought.

What does everyone else think? I haven't crunched his numbers, but I figure it is worth mentioning before he cooks something.

[txboatpilot]

If your calculations come up to 118 amps, I would be very cautious. Consider starting with a smaller prop and record the amp draw on the system. Others will record temperatures, which I would do anyway. This way, you don't cook an ESC that is not easily replaced due to funds. Just my thought.

What does everyone else think? I haven't crunched his numbers, but I figure it is worth mentioning before he cooks something.

Where are you coming up with 118amps?? Please dont tell me it is the FECal?


The only way too know the amps for sure is to run a Data logger...

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I got a car friend of mine to do the numbers for me, working out the max amps using Watts/Volts; not sure if it is correct though.

I'll need to find a UK shop, since I don't want to have to order a prop all the way from the US. The Duty & VAT is killing me!

[Flying Scotsman]

Wow 8S on a CC 120HV and that motor. The RPM will be in the region of 44,000 RPM.
I do not think this is a wise choice.

Douggie

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Ouch, lucky I haven't got the batteries yet. Will 6S be a better choice?

[Flying Scotsman]

Have you purchased
the ESC and motor?
Douggie

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Yes, I was suggested by CC to use that ESC and Motor, along with that prop.

[Flying Scotsman]

Did they know you are going to run a 39" hull of your own design...wood and fibreglass and I presume a mono hull. CC is great on info for cars, boats not so good.

Douggie