Azimut Atlantic Challenger

[Alfa Spirit]

Build yours with 4 adapters and 2 short 3/16 flex cables

Like this but more stronger

[Peter A]

Hi peter I did contemplate that, if it was only say 2” long I wouldn’t need any stuffing tube support would I?

I’m quite entertained about having an internal cooling system, if it doesn’t work, I have all the piping and all I have to do is take the tank out and drill some holes...

Like I say it’s a big hull plenty of space and designed around having a 12v lead acid battery in it...

Steve, I don’t think I’d ever get it to line up perfectly so think it would vibrate / do some damage...

Yep about 2" should work. You can get the alignment pretty bang on by setting up with some solid shaft in the couplers to hold the motors straight in line and the fixing the motor mounts. Some urethane sealant/glue may be good for fixing the motor mounts, especially if they are a basic L shape. Just make small packers for height adjustment and fix in with the glue. If this is 'the mod' for the rest of the boats foreseeable life then a good permanent job is what you want to do. I am sure you will figure out a good way to do this.

[vvviivvv]

I plan to put a sheet of fibre before I begin, the hull layup is fairly thin, then the shaft height is about 40mm so will probably have to build a platform to mount the motors too,


But yeah, ill see if I have some spare 4.75mm Flexi offcuts, I have 1 set of 5mm to 4.75mm couplers so will get another and we should be good to go...

[Alfa Spirit]

Here are Graupner 700BB Turbo specs. This is a 1350KV brushed motor.




- What is the gearbox ratio ?

[vvviivvv]

Hi, picture doesn't show up..

I think its a ~50% reduction, 11tooth on the motor, 25 on the shaft.

I can't remember what cells I ran it on last time, I think I used 6s as that's what I had at the time... and I didn't run it flat out maybe 75% was enough..

I'm going to start off with the 8XL which is about 2100kv on 4s. and judge it from there,

Eventually I'd like a lower KV motor, higher cell count and high capacity packs with a long run time...

[vvviivvv]

Found a pic of what it comes as...

Was a lot of work for someone new to boat building

[Doby]

https://www.cornwallmodelboats.co.uk/acatalog/Robbe-Heavy-Duty-Coupling-5-5mm-R1436.html#SID=1586

I use these to connect some 9Xl's to straight shafts on one of my scale boats...work well.

[fidelity101]

Any updates?

[vvviivvv]

Hi,

Been at work for the last 14 weeks, just sailed from Miami to Nassau, will be back in Miami Saturday and flying home... apparently summer is over back home and it’s a good time to start progressing, I’m still waiting for the esc for my hpr... slowly being built but might just run the damaged one in this.

[fidelity101]

Probably not the best time to be sailing...hopefully it's a big boat. :)

This boat looks really nice. I'm bummed out that Graupner decided to discontinue it.