Long term project 51" mono proposal

[Old School]

I am looking at a long term project involving a 51" mono hull "King of Shaves" with the bare hull available from Hong Kong. Obviously, 1/4" drive would be essential, but would a single 56XX series motor (say a 5692) have enough grunt to propel such a hull size. First task would be a carbon fibre inlay before adding mounts, etc.

I would be thinking running a 240 - 300 amp ESC and 6s (probably 2 X 3s packs). Would a stinger or strut be the preferred option plus a propellor diameter to start testing with, please? I need a few answers to cost out this project.

Edit: searching Google images lead to this small thread

https://forums.offshoreelectrics.com...IN-P1-Powerbot

Also found this -

https://forums.offshoreelectrics.com...7cm-Twin-Setup

[rol243]

good size hull. have you had a look at Sonic Racing,s web page ? Danny is the owners name , he is local and has been in the r/c boating scene for a good 30 years. his hulls are mainly gas power designs but i am sure he would have a nice 50 plus inch offshore mono hull available in glass or even carbon fibre. hey you would need more battery power than a 6s for this size rig. [ 12s ]

[Old School]

12s is a lot of voltage, probably more than I care for. Pity

[rol243]

you must remember your also talking a big boat.

[CraigP]

Yea, 12s minimum!

[Doby]

10S is MORE than ample...having built several that size. As its a scale hull, I'll assume that you want some speed but not stupid crazy fast...55 on a boat that size is pretty fast.

Get a motor around the 700 (ish) KV. A Leopard 56 110 would have more than enough grunt for that hull.

[Old School]

Many thanks, I am only after a 'modest' speed and around 55 sounds about right.

[jaike5]

Doby is correct...... did I just say that !! 10s 2p 5000mah per lipo pack. hi 60's, low 70's for roundy round, my DF Sniper 45" 19lb all in.

Cheers, Jay.

[rol243]

i have a deltaforce inniliator 53, running a cocr bj-1 prop high 70,s. only issue is its powered by liquid fuel . i think total weight comes in at around or under 15 pound max.

[Old School]

Many thanks gents. While liquid fuel is nice, I prefer the noise a brushless makes when it screams. The gas motors remind me of lawn mowers. 10s 2p would I presume involve four packs with two each in series and then each set of two paralleled.

[Doby]

Many thanks gents. While liquid fuel is nice, I prefer the noise a brushless makes when it screams. The gas motors remind me of lawn mowers. 10s 2p would I presume involve four packs with two each in series and then each set of two paralleled.

yup...

[Doby]

Doby is correct...... did I just say that !! 10s 2p 5000mah per lipo pack. hi 60's, low 70's for roundy round, my DF Sniper 45" 19lb all in.

Cheers, Jay.

I usually am....

[CraigP]

Just not sure where all you guys are relating higher voltage to stupid fast speeds. You guys realize, it can be set up at a higher voltage to pull lower amps, increase runtime and make the whole electrical system much more reliable. It would seem that many of you just follow voltage/setup templates of others and don’t really understand the volt/amp/Watt/Kv/prop relationship. That’s fine with me, but insulting others because of your misunderstanding just ain’t looking so good from where I sit.

[Old School]

Craig,
I did not see what was being said as insulting and I am sure no one intended any insults as such. When using 12s would you prop down to limit amp draw? As ESC are not intended for partial throttle demands then how does a higher battery voltage impact on the boat without increasing its speed, please? As a battery will cost me around $125.00 each (5000 mah 6s) and I would need four then potential voltage requirements for the boat may be the killer of the project. Theoretically without a duplicate set of batteries I would be looking at about a seven minute runtime per day allowing for batteries to recharge overnight between runs.

[Doby]

Just not sure where all you guys are relating higher voltage to stupid fast speeds. You guys realize, it can be set up at a higher voltage to pull lower amps, increase runtime and make the whole electrical system much more reliable. It would seem that many of you just follow voltage/setup templates of others and don’t really understand the volt/amp/Watt/Kv/prop relationship. That’s fine with me, but insulting others because of your misunderstanding just ain’t looking so good from where I sit.

Duuhhh...well...golly gee...why didn't we all thunk of that, high volts and not so much current....??? You iz so smart...the rest of us just follow'in blindly along not know'in what we iz do'in.

10S is more than ample..Yes..12S would reduce current even more...but then lets run 20S and have even less. 12S=more $. Just trying to save him from spending money thats not necessary.

Oh, and no-one is insulting anyone on this thread...

Until you posted