Robert
Early Tiger 1 from sPzAbt 503
Re: Early Tiger 1 from sPzAbt 503
Time to get out of the fire extinguisher.
Robert
Robert
Re: Early Tiger 1 from sPzAbt 503
A couple of videos. This one is taken in the shade. In the sun, it is impossible to see the yellow light.
It looks better in the garage:
If everything had looked convincing, it might have been worth the effort to make the plumbing and valves. I am leaning toward scrapping the idea.
But it would have been cool!
It looks better in the garage:
If everything had looked convincing, it might have been worth the effort to make the plumbing and valves. I am leaning toward scrapping the idea.
But it would have been cool!
Re: Early Tiger 1 from sPzAbt 503
Looks cool to me 
Robert
Robert
Re: Early Tiger 1 from sPzAbt 503
Thanks Robert - you are always so kind! 
After some challenges, I have finally managed to get a set of suitable lithium batteries. Installing them will be the next project in line.
There is one wire to each cell for the balancing circuit.
Here is the "before" picture:
Wonder if this is really going to work? 
Hesitating to take the plunge!
After some challenges, I have finally managed to get a set of suitable lithium batteries. Installing them will be the next project in line.
- resize-IMG_6349.JPG (361.42 KiB) Viewed 1607 times
Here is the "before" picture:
- resize-IMG_6344.JPG (426.19 KiB) Viewed 1607 times
Hesitating to take the plunge!
Re: Early Tiger 1 from sPzAbt 503
Well, on with it!
Batteries removed:
80 kg worth of lead. How am I going to do without it? 
And the wiring nes.... eh... erm... loom:
Battery rails need to be moved. Installation in progress:
It all fits!
The finished installation echoes of emptiness:
It will be interesting to see how 9 kg lithium will stand up to 80 kg lead capacitywise... 
Testing starts today.
I once calculated the scale combat weight to 250 kg. With the lead batteries, it was around 200 kg. If the math works out, we should now be around 130 kg. Featherweight!
Maybe I should add some of those old lead batteries as ballast weight?
Batteries removed:
- resize-IMG_6352.JPG (409.27 KiB) Viewed 1601 times
- resize-IMG_6353.JPG (386.6 KiB) Viewed 1601 times
- resize-IMG_6354.JPG (455.46 KiB) Viewed 1601 times
- resize-IMG_6355.JPG (303.29 KiB) Viewed 1601 times
- resize-IMG_6356.JPG (421.12 KiB) Viewed 1601 times
- resize-IMG_6357.JPG (403.99 KiB) Viewed 1601 times
Testing starts today.
I once calculated the scale combat weight to 250 kg. With the lead batteries, it was around 200 kg. If the math works out, we should now be around 130 kg. Featherweight!
Maybe I should add some of those old lead batteries as ballast weight?Re: Early Tiger 1 from sPzAbt 503
Hello
Lots of spare room in your tank now.
Looks Ace to me.
Robert
Lots of spare room in your tank now.
Looks Ace to me.
Robert
Re: Early Tiger 1 from sPzAbt 503
Nice work, now you kan hawe a verry larg soundspeker in the tank.
Hans K
Hans K
Panzar e Kul
Re: Early Tiger 1 from sPzAbt 503
Exactly!
Re: Early Tiger 1 from sPzAbt 503
In the end, I added as many lead batteries as I could for ballast (10=27kg). Performance of the model is very good indeed now. No hesitation in any turn or anything. Just full power and agility. I expect the motors run cooler this way as well, since they never stall out.
First and second round of testing was a continuous sequence of hard and neutral turns on as difficult ground as I could find. for as long as I had patience. The total was three hours. Checking voltages and charts afterwards to figure the remaining capacity, indicated that there was around 20% left. However, figuring capacity is difficult. The voltages in the charts assume a 60A discharge current, which my model never gets near. I think the maximum is just above 15A according to earlier measurement. I have never blown the 25A main fuse. Voltages on the batteries are also very much temperature dependent, which complicates things further. I suspect a capacity meter would have to take all these factors into account, or how do they work?
Saturday's show in Borås worked flawlessly. I was even able to chew a small, but steep hill, which I have had to avoid in the past. It was nothing!
Figuring the remaining battery capacity on return home, it looked like the day had consumed something like 1-3% of the total. Easy and flat terrain, but is that possible?
Although there is no capacity meter yet, I think the battery project can be called a monster success that lets me move forward with the next thing on the todo list. There is plenty to do! 
First and second round of testing was a continuous sequence of hard and neutral turns on as difficult ground as I could find. for as long as I had patience. The total was three hours. Checking voltages and charts afterwards to figure the remaining capacity, indicated that there was around 20% left. However, figuring capacity is difficult. The voltages in the charts assume a 60A discharge current, which my model never gets near. I think the maximum is just above 15A according to earlier measurement. I have never blown the 25A main fuse. Voltages on the batteries are also very much temperature dependent, which complicates things further. I suspect a capacity meter would have to take all these factors into account, or how do they work?
Saturday's show in Borås worked flawlessly.
I was even able to chew a small, but steep hill, which I have had to avoid in the past. It was nothing! Figuring the remaining battery capacity on return home, it looked like the day had consumed something like 1-3% of the total. Easy and flat terrain, but is that possible?
Although there is no capacity meter yet, I think the battery project can be called a monster success that lets me move forward with the next thing on the todo list.
There is plenty to do! Re: Early Tiger 1 from sPzAbt 503
2,5 years since the last post!
The fire simulation has indeed had to go in favor of better loudspeakers. These are 3D printed according to mrTyko's recipe. He was also kind enough to donate the bass membranes. The speakers are still work in progress (leaking), as I am still working on the basics (making the sound system work properly).
It DOES work, however. I am currently occupied with the volume control, using a digital potentiometer in the Arduino controller, rather than a small analog potentiometer sitting on top of a servo, that I am currently using. I am an electrical engineer, so a digital potentiometer is the proper way for me. A mechanical engineer would probably choose gears and levers. Oh, and grease!
I made this small panel to hold my charging connectors.
MUCH better than fumbling after loose ends!
The smoke unit needed relocating with the new speakers in place and is now mounted lengthwise in the hull. I printed a few steady supports, so it does not fall over, and a filter holder. The filter prevents blowing dirt into the delicate smoke generators. In all, a MUCH tidier installation than before.
There was not room for the commercial pvc tubing, so I tried to print my own. It took a while to get everything correct, but it fits, has a smooth airflow, is easy to remove the smoke unit and I did not have to go out to shop for parts! Yay!
The visible gray tubing is PLA and the connector down to the white PVC tube is printed in flexible polyester (FPE). This makes the smoker easy to connect/disconnect while not leaking. What looks like clear tape, is indeed clear tape. It is there to cover old holes. It has worked well in the past, so may well be an almost permanent solution. If I revisit any of the parts, I will redo them without the unneeded holes, of course.
Here is a view from behind showing the entire layout:
Although not perfect, it is a LOT tidier than before!
//
The fire simulation has indeed had to go in favor of better loudspeakers. These are 3D printed according to mrTyko's recipe. He was also kind enough to donate the bass membranes. The speakers are still work in progress (leaking), as I am still working on the basics (making the sound system work properly).
I made this small panel to hold my charging connectors.
The smoke unit needed relocating with the new speakers in place and is now mounted lengthwise in the hull. I printed a few steady supports, so it does not fall over, and a filter holder. The filter prevents blowing dirt into the delicate smoke generators. In all, a MUCH tidier installation than before.
Here is a view from behind showing the entire layout:
//
Re: Early Tiger 1 from sPzAbt 503
It looks like a simple and good solution, nice.
Hans K
Hans K
Panzar e Kul
Re: Early Tiger 1 from sPzAbt 503
Nice to see your work on your Tiger.
The digital potentiometer and the Arduino controller, sounds very interesting, will follow this with great interest.
And what did we do before the 3D printers? They are so useful.
Also looking at your conversion of the smoke units, most interesting.
BIG fan and you did some rebuild of the smoke house also.
Cant wait to see you and your tanks live again.
Robert
The digital potentiometer and the Arduino controller, sounds very interesting, will follow this with great interest.
And what did we do before the 3D printers? They are so useful.
Also looking at your conversion of the smoke units, most interesting.
BIG fan and you did some rebuild of the smoke house also.
Cant wait to see you and your tanks live again.
Robert
Re: Early Tiger 1 from sPzAbt 503
A digital potentiometer is a small IC. I bought a bunch for the future, in case it would be a success. Unfortunately, these are no longer available.
The old Flintstones type solution with a potentiometer on top of a servo, was unreliable. Of course, if you do it right, it will work too. This is how not to do it:
To the right, you can see one under the wires of the Arduino prototype board (yes, there are more of them):
It took a while to get it all sorted, but it works!
I can now control the volume on the transmitter, without any analog devices that can foul things up. Not necessary, but I wanted to try it.
The tiger now has a new sound system, capable of making noise!
https://www.youtube.com/watch?v=ma1k5xJ3KWg
The old Flintstones type solution with a potentiometer on top of a servo, was unreliable. Of course, if you do it right, it will work too. This is how not to do it:
To the right, you can see one under the wires of the Arduino prototype board (yes, there are more of them):
It took a while to get it all sorted, but it works!
I can now control the volume on the transmitter, without any analog devices that can foul things up. Not necessary, but I wanted to try it.
The tiger now has a new sound system, capable of making noise!
https://www.youtube.com/watch?v=ma1k5xJ3KWg
Last edited by cahlfors on March 18th, 2021, 4:19 pm, edited 1 time in total.
Re: Early Tiger 1 from sPzAbt 503
Exciting that you did succeeded with the digital volume control.
Cant wait to hear your Tiger roar in real life, but I think my is the quiet one now.
Robert
Cant wait to hear your Tiger roar in real life, but I think my is the quiet one now.
Robert