I will make it to the best of my ability. I will make parts a few times until right, it tends to hold me up sometimes. I'm not a perfectionist by any means but I have to satisfy myself at least. im certainly not a rivet counter. I must say though I do stand in awe at some of the creations made by our fellow modellers.if I can be half as talented I'd be happy. I served my apprenticeship in the Sheffield steel industry and qualified as a master patternmaker. Using mahogany.pine jelutong, metal and fiber glassed resin for patterns and models.mind that was a few years ago now. Thanks for your help once more, regards Rogal.

Glad to have been of help Roger,
If I know I say so!
If I don't know (and get curious) or am just not certain of some detail - I find out😉
Engineer's instinct coming out.
Looking forward to the rest of your build and, of course, the sea trials👍
I guess you know that Skydive130 has set the bar pretty high for Orca.
https://model-boats.com/blogs/68096?sort=ASC
But we'd all mucho like to see your interpretation of her.
Have fun,
Cheers, Doug 😎

Great info Doug. When someone knows what they are explaining it makes understanding a lot easier .Thankyou so much for all your input.Roger

Hi dave I've been using the 3s in my Brave Borderer for about a year now and when purchased also bought same make charger,spektrum was make with discharge , storage, and charge facility plus lots of other monitoring of cells etc. I was weary at first but feal confident to use lipos now.thanks for your input. Roger

Hi Dave,
I agree👍 Rowen's thoughts exactly mirrored mine.
She might 'fly' with the 3S, or rip the shaft out or strip the gears😮
Figured Rogal might have the 2.5 gearing, it's the smallest of the 919D gears.
They go up to 3000, ~6rpm off load.

Ref. the 1060 ESC - I have a few, very reliable and easy to set up.
I use them with 540/550 type motors and I've not yet managed to make one warm up.

Yes they do have LiPo protection. It's a 2 stage protection described in the user manual.
Stage 1: Trigger point 3.25V per cell, i.e. 6.5V for a 2S.
At which point the ESC reduces power output to 50%, so you have a chance to tootle into a safe harbour😊
Stage 2: Trigger point 3.0V per cell, i.e. 6.0V for a 2S.
At which point the ESC cuts power to Zero, the boat stops dead and needs a tow or shove home 😮😭
Cheers, Doug 😎
PS I like Hobbywing Quicruns in general. The 1060 or 860 dual version for brushed, and the 16BL30 (30A) for brushless. Never had a problem with them.

Hi Roger
I agree with Rowen and you have decided that a two cell will be best. The ESC does appear to be LiPo suitable but it does need to have the ability to protect the battery from over discharge and the specs on-line are rather lacking in this detail. Basically LiPos require protection from over charge or discharge to ensure safe operation. You will also need a LiPo balanced charger. Used correctly LiPos provide plenty of power for our models but you do need to follow the instructions for use to the letter to avoid any problems. I look forward to seeing some on-water pics, please.
dave976

Hi RowenThanks for the reply, it wasn't until later that I realised the voltage of a 3s myself. 2s will be plenty. I was just not sure in my own mind I had the right components, after initialy going down the lead acid route.then wanting to change at this later stage. The ORCA was never a speed boat, although if it had have been a bit faster the dam shark wouldn't have caught it.mind you there wouldn't have been much of a film then!. 1 point I didn't mention in my initial post is that the motor is geared down a ratio of 2.5 to1.

Roger,
Think all should be well, a LIPO battery with a LIPO adjusted ESC.
Problem you will have, unless the Orca crew want to waterski, it will be vastly overpowered!
3S is around 12 v against the 6 needed.
Be better with a 2S rather than 3 as that is only 7.4v.
Certainly be entertaining!
I have modified my fleet using XT60 connectors and can change batteries around. Makes experimenting with different LIPOs easy.
Best Rowen