A sprint to the finish line, or how to design build, and test a new model in 3 weeks

[bigdave]

Here are the inside linkage assemblies out of the sub.
Shown is the servo module for the tech rack.
No binding and good throw.
Also my Engel parts came today. Woo hoo! BD

[Ralph --- SSBN 598]

This looks familiar.

[bigdave]

Very cool.

Well last night I installed the bayonet ring into the hull. Always a nail biting experience as you can only hope you put enough release agent on the inside of the ring to keep the epoxy from really ruining your day.
But break free she did this morning. STP was my release agent of choice.
I finished up the ESC mount today.
I also wired and tested my motor and ESC. I am very happy with the Engel drive system.
It should work very well although I don't think I will get much speed with a 4400 RPM max.
But as it is more of a concept test than anything I can add a faster RPM motor if needed later.
BD



I am getting close to the time I will have to choose a linkage method for the outside of the hull.
From the rotary outputs to the pumpjet assembly.
The German modeler used ball links. It is basically a swash plate like in a helicopter but operated vertically.
I have a few other ideas ass well.

[bigdave]

Was able to get in a few hours in this weekend.
I have a design for the linkages.
It's worth a try.
Adjustable rubber bushings.
Simple to make and easily adjustable. BD.

[bigdave]

The first fitting of the drive parts went well.
Now I can make the four outside linkages.
I also made a finned cooling doojobber to pull any heat off of the motor mount.
Also I think it adds an interesting look to the rear. BD

[bigdave]

Today was a day filled with extreme frustration.
Three times I went through the tedious process of assembling the tech rack.
And three times I had to take it apart again to fix something I installed wrong.
It kind of like a Chineese puzzle box getting it all installed.
Well the forth time it is together enough for making the linkages but it will have to come apart again as Im thinking I missed the flat on one of my output shafts. It's not very positive.
O well!
At least I am very familiar with how it goes together now. BD

[bigdave]

Well I made it to Carmel with the sub but it's not done.
But I thought I would show my progress so far. BD

[greg w]

Well BD the design is looking good but since you didn't meet your self imposed
Deadline maybe you should rename this thread

[bigdave]

I will get right on that Mr Pita. BD

[bigdave]

Well I have the sub sitting on the bench in front of me trying to remember where I left off and what is left to do.
My brain hurtz! BD

[bigdave]

I did some work adjusting the linkages today.
The system I came up with seems to be working on the bench.
I used rubber bushings on the rear linkage connection points.
Like bushings on your cars suspension to add some flex.
The four links are adjustable for length as well.
Here is a video I took of the system in operation. BD

https://m.youtube.com/watch?v=CEm-IoTHeu8&feature=em-upload_owner

[bigkim100]

Brilliant sir, I share you love for a bit more obscure sub...long and black doest really interest me any more...altho they can be beautiful

[thor]

As you said Dave, Pretty damn cool!

[redboat219]

It's like an animatronic alien head, lol.

[bigdave]

I have asked for ideas from my friends and 8 ball buddies and have settled on a theme.
My plan is to add small wings/ailerons to the sides just aft of the center split.
They will be connected to two servos and mixed in the radio like flapperons.
This will hopefully allow me to roll the sub.
Plus add a coolness factor.
Then I will add a canopy in the center connected to the trim ring, and brass bands with rivet detail to give a steampunk look. Here are a few photos of the wings and canopy. BD