GRX SAW RiGGER

[grsboats]

I've been working hard with this Project so that speed is quite good but doesn't make justice for the real potential of this boat.The flexcable broke near the collet maybe because the MBP was seriouly damaged by the motor screw.....and yes I use loctite everywhere but you must have heard of Murphys law .Gill

[urbs00007]

saw rigger

gil, what speed do you think you can obtain with your boat? you are running the 1527 neu on 6-s right? are you running 1/4 inch brass shaft tube ?

[RaceMechaniX]

If you lost a motor screw, there was a strong possibility the motor was not rigid and had enough misalignment through vibration to break the cable. It's happened to me.

[urbs00007]

saw rigger

tyler, its amazing what vibration can do. on a solid shaft setup with my neu 2230 i used octura u-joint (dog bone setup 1/4 " solid shaft) the hardened pin (on the male part ) removed itself from the joint. tried to remove pin from new joint had to hit as hard as i could with a hammer and punch to remove. happened twice gave up on u-joints

[grsboats]

Tyler only one of the four screws came out and mangled the rear of the collet so maybe I forgot to loctite it I don't know.The flexcable failure is unknown as it was a new Hughey shaft but in saw everything is possible.I only use 3/16 shafts on my Fe boats .Yes it is a Neu 1527 2300kv on 6S so at least in theory speeds up to 125mph can be reached.Gill

[grsboats]

Yes it is 1/4 "stuffing box. will post pics of the broken parts.Gill

[Brushless55]

Tyler only one of the four screws came out and mangled the rear of the collet so maybe I forgot to loctite it I don't know.The flexcable failure is unknown as it was a new Hughey shaft but in saw everything is possible.I only use 3/16 shafts on my Fe boats .Yes it is a Neu 1527 2300kv on 6S so at least in theory speeds up to 125mph can be reached.Gill

is that the motor your are using in this rigger?

[grsboats]

Yes Brushless.Gill

[grsboats]

Put the collet on the lathe just to rework it...won't use it but will make a test to see the grip on the rotor in a low kv leopard...changed for an alu pushrod with balls for the rudder .....the first broken flexshaft in months.In the core of the shaft there are some signs of rust. Gill

[urbs00007]

saw

gil, how do you still have the flex cable.? did your water pickup keep it from coming out the strut?

[grsboats]

Yep!

[martin]

Gill what are your thoughts & experience on the prop water pick ups slowing boats down because of interfering with the water leaving the prop. As some say it slows boats down over say rudder pick ups or flush hull pick ups (in monos or cats & not riggers). Martin.

[RaceMechaniX]

Gil,

Did the break in the flexcable occur in the section between the collet and stuffing tube? It could have just snapped from power.......

TG

[grsboats]

Martin all my nitro saw riggers were and are equipped with steelblade rudders and auxiliary water pick ups with great results.For this paticular boat it was inttended to use also a steel blade rudder but I had no time to make one so it feeds the motor water cooling.I don't think there is a loss of speed as they are Always positioned above the shaft line on my boats.The other types i never got a try.Tyler the break occured half na inch up the exit of the stuffing box .When I got this cable it came rusted in the bag so there must be some corrosion inside the core......Gill

[martin]

Gil what position do you have the pick up looking from behind the prop also how far up from the centre of the prop is the pick up & how far behind the prop is the pick up. Thanks Martin.