Home built rigger questions

[BCRandy]

I am building a small rigger just to play with. It will be
(22" long and 10" wide. I will use either a pair of 11volt,
20C, 2200mAh cells or one (or more) of the 6-cell, 7.2 volt,
3400 mAh NIMH battery packs I have.

My first question has to do with the motor. I am looking at
a Feigao 540S form Offshore
Electrics. It is available in Kv ratings ranging from 2858
to 5915. What Kv range should I get and what would be a
good place to start propeller wise?

My second question has to do with the receiver. I want to
use my aircraft Spektrum DX6i with an AR6000 receiver. I've
read about others having reception problems with Spektrum
equipment in boats and I was wondering if extending the
antennas in multiples of the original length and mounting
them up under the deck (or even vertically through the deck)
would help. All thoughts/experience/references will be
appreciated. TIA.

Randy

[deestingray]

I don't own a rigger at all however have read a lot about them.
Generally speaking, the higher KV motors with small lifting props are
better for riggers. There are a couple of advantages with running this
way in that you don't have to run a lot of cells to get it up and
running. If you hypothetically ran something like a 6S which is up
around 6,000KV and a 32MM prop, you could run it on a 2 cell lipo 7.4V
for an rpm around 40,000 which is pretty high anyway. With the smaller
prop, it isn't taking such a huge bite of the water so you theoretically
get a lot less propwalk which makes handling a lot better.
If you were to go this route, be prepared for some headaches and
spending coin, the amp draw can get high so you will need a good esc.
With the extra speed, you will also want a pretty strong boat. High
amperage = lots of power consumed quickly and lots of heat so you would
also want a high discharge lipo, at least something above 20C preferably
25C. If you do want to run on 3S 11.1V, drop your KV down to something
around 3500, you will probably find that it will be a lot more
reliable. Riggers in general are quite hard to set up, whilst they do
go fast, also be prepared for a fun time learning to set up your boat.


--
deestingray
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[Rex Reynolds]

"deestingray" <deestingray.386x21@no-mx.forums.yourdomain.com.au> wrote in
message news:deestingray.386x21@no-mx.forums.yourdomain.com.au...
>
> I don't own a rigger at all however have read a lot about them.
> Generally speaking, the higher KV motors with small lifting props are
> better for riggers. There are a couple of advantages with running this
> way in that you don't have to run a lot of cells to get it up and
> running. If you hypothetically ran something like a 6S which is up
> around 6,000KV and a 32MM prop, you could run it on a 2 cell lipo 7.4V
> for an rpm around 40,000 which is pretty high anyway. With the smaller
> prop, it isn't taking such a huge bite of the water so you theoretically
> get a lot less propwalk which makes handling a lot better.
> If you were to go this route, be prepared for some headaches and
> spending coin, the amp draw can get high so you will need a good esc.
> With the extra speed, you will also want a pretty strong boat. High
> amperage = lots of power consumed quickly and lots of heat so you would
> also want a high discharge lipo, at least something above 20C preferably
> 25C. If you do want to run on 3S 11.1V, drop your KV down to something
> around 3500, you will probably find that it will be a lot more
> reliable. Riggers in general are quite hard to set up, whilst they do
> go fast, also be prepared for a fun time learning to set up your boat.
>
>
> --
> deestingray
> ------------------------------------------------------------------------
> deestingray's Profile:
> http://www.modelpowerboat.com/forum/member.php?userid=52
> View this thread: http://www.modelpowerboat.com/forum/showthread.php?t=599
>
last time I talked to a fella with a blizzard rigger(roughly the same size)
he had been running a 540 8s(4436kv) on 6 nimh cells...w/ an x432 it was
pretty quick. hth
rex