Hey,@Chum444

I missed a part of your comment. The boat is scratch built. The hull was a paid SOLIDWORKS design and turned into a 3d printable file.
Everything but the hull is handmade, including the drive shafts.
I specially ordered for the flare 🎃🔥

Photo: Hull no 3

-Sakib

Great observation,Chum444!

Yes, it was a stern heavy boat on the first trial. These are my first ever trial photos,i ran again but i don't have any other running photos.

Originally,i didn't plan for opto ESC's. But i had some opto ESC's (these are usually used in drones and very lightweight) and end up using a couple of those. But the original boat ESC's are a bit heavier and the plan was to use them for some weight.
Another problem i noticed,this was a small boat to use a 5200mah 3s lipo. I made a small space under the bridge section for the battery,and the 5200mah just fits. But it made the boat stern heavy while running fast.

One more thing,i added some steel balls to gain some stability under the bridge section+ beside the rudder's. Those made the boat stern heavy as well.
So ,now I'm trying fix them one by one. This was my first ever sportfish & made some silly mistakes,so i appreciate every little bit you guys suggest!

Here, I'm gonna leave some photos of hull no3. She's a better boat than this one. It has bigger and heavier motors(i had emax 2212 1400kv) , front ESC's which are heavy ,and battery space at the center.

I will try to upload a bunch of photos when i can.(it was a custom order) CHEER'S!

-Sakib

Just. something for you to evaluate as you please. Sport fisherman at speed do not run in a bow up attitude. At most maybe 1/3 rd of that bow angle. A 1:1 SF typically runs 20-24 kts. A 35+ ft SF’s fuel consumption at that speed is between 50 to 75 gallons of fuel per hour. You might choose to set your throttle channel endpoints a fair amount lower.Just an observation on my part; certainly not being critical.
Great looking build. Was it from scratch? What did you use for plans? I really like the bow flair.

All hail SPORT FISHERMAN 💪😅

Sport Fisherman boats rule.

Hi Sakib

As regards the rudders the theory is Ok but the wire used is very thin for a push/pull system. Also that vertical part of the bend is likely to flex a lot. Have you tried operating the servo and holding the rudder blades lightly?

Also where the wire is bent to go into the arms it may spring out unless you have secured the ends on the underside which we can't see.

Chris

Thanks a lot for the sharing,Chris!

Firstly, same here. I'm not sure how it will work or even if it will work or not. Hopefully the shafts wont bent, HOPEFULLY.

And the rudder linkage, I'm not sure what you were talking about. I hope you will share some more ideas so i can do better with them.

I live in Bangladesh and there's no Boat shop here. I am trying these ideas so i can know before opening a Boat shop/Hobbyshop. I do get the parts from China but bringing all the part's are kind of expensive so i tried to build some parts myself. R&D 😊

-Sakib

Given the slight angle of the rudders and the fact that they will cancel each out maybe they will be Ok.

Not so sure about the motor and prop shaft though! As well as being brass M2 is very thin and with flexible motor mounts you could very well get whip in the prop shaft which will give very bad vibration, particularly as the motors are high kV.

Bit concerned about your motor mounting and rudder linkage!

I don't know where you are but do you have difficulty in obtaining threaded stainless steel prop shafts?

The motor and prop shaft always sound noisy when bench running, especially without the superstructure, but are much better once on the water.

Be interesting to see how it works out but I wouldn't be surprised if you have problems and noise!

Chris

I chose brass because it doesn't catch rust. And i had to cut some threads on the shaft. Brass is softer than SS.
I tried to thread my ss shafts but my drill machine can't handle it.
I don't have lathe either so brass was my only option.

Im putting some photos,there you can see i used brass shaft on them both and they didn't let me down,till now. 😐
So i had to keep faith!

-Sakib

Sakabian, I like your setup, but find it hard to understand why you used brass for the prop shafts as brass is brittle and will snap very easily if there is any vibration or sudden shock from props hitting submerged obstacle.
Cheers Colin.