vvvIIvvv's HPR115

[westbeach]

Liam, I started this thread so as not to muddy up Randy's Hpr115 thread build.

You're running Neu 1521-1Y on 6S 5000Mah. The KV of the motor and the 6s should bring you to around 35,000 rpm/kv. I can't see why you can't get on plane. Have you played with the setting on the esc? Check your driveshaft, make sure there is no binding.

[vvviivvv]

Thanks for the thread... i set the esc's up as i was told to... the programming is in german... i might run it on Thursday and video it so people get a idea... i will try how it is currently set up them move the weight way forward...

any 1 with a idea is appreciated.

[Gerwin Brommer]

Few good pics of the interior, , side-back-view, and back of the boat, might help ?

[vvviivvv]

here's how its set up... how far the drive is down etc... and btw is this the correct rotation of flex shaft for a prop spinning this way?

[vvviivvv]

hah ^ 10 seconds sooner -.-

[Gerwin Brommer]

Rotation/prop is okay.
Second pic : no space between drivedog-white washer, and the drive ??????
4th pic : is that grease at the bearing, or has the alu tube widened ??

[vvviivvv]

no space there...

grease on 4th pic

[Gerwin Brommer]

Please leave some space between de drive and the drivedog !
When running the boat, the flex will "shrink" under load.
So they will pull the drivedog towards the motor = drivedog will rub against the drive =massive friction !!!!

Where is the COG in your boat, measured from the transoms ?

[vvviivvv]

cg umm it doesn't have one. i just guessed it as i never understood it...

[Gerwin Brommer]

center of gravity.
Is the point where the boat is in balance.
With the lipos in the normal place, determine the balancepoint.
Put the boat on a table, let the back go over the edge of the table.
At the point where the boat starts to slide off the table : that's your cog.
Is that point somewhere in the 33-37 centimeter range, measured from the transoms ???

[RandyatBBY]

Try pushing the struts all the way up up. Instead of all the way down and making the boat run wet and harder to launch.

[vvviivvv]

its right in the middle actually gerwin... 35cm from transom


randy, the boat creates a massive bow wave it needs pushing over the top if you get me... will lifting the drives achieve this?

and gerwin now i completely understand how to measure cg..

[vvviivvv]

i have a 1 - 2mm gap between now gerwin in the shaft...

[Gerwin Brommer]

1mm is enough.
I just saw the other topic where I saw what props you are using...................
1.8 pitch !!!!!!!!!!!!!!!!!??????????????
The hpr06 is a catamaran, NOT a purposebuild SAW-rigger !!
please look for props like octura X4.. series !

[Flying Scotsman]

If I was in your shoes I would change out the motors for a lower Kv and run 8S

Douggie