Early Tiger 1 from sPzAbt 503

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mrTyko
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Re: Early Tiger 1 from sPzAbt 503

Post by mrTyko »

Time to get out of the fire extinguisher. :clap: :clap: :clap:

Robert

cahlfors
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Re: Early Tiger 1 from sPzAbt 503

Post by cahlfors »

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. :thumbdown:
But it would have been cool! :angel:

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mrTyko
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Re: Early Tiger 1 from sPzAbt 503

Post by mrTyko »

Looks cool to me :thumbup: :thumbup: :thumbup:
Robert

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Re: Early Tiger 1 from sPzAbt 503

Post by cahlfors »

Thanks Robert - you are always so kind! :D

After some challenges, I have finally managed to get a set of suitable lithium batteries. Installing them will be the next project in line.
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There is one wire to each cell for the balancing circuit.

Here is the "before" picture:
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Wonder if this is really going to work? :eh:
Hesitating to take the plunge! :oops:

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Re: Early Tiger 1 from sPzAbt 503

Post by cahlfors »

Well, on with it!

Batteries removed:
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80 kg worth of lead. How am I going to do without it? :lol:
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resize-IMG_6353.JPG (386.6 KiB) Viewed 851 times
And the wiring nes.... eh... erm... loom:
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resize-IMG_6354.JPG (455.46 KiB) Viewed 851 times
Battery rails need to be moved. Installation in progress:
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It all fits!
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The finished installation echoes of emptiness:
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It will be interesting to see how 9 kg lithium will stand up to 80 kg lead capacitywise... :shock:
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! :crazy: Maybe I should add some of those old lead batteries as ballast weight?

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mrTyko
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Re: Early Tiger 1 from sPzAbt 503

Post by mrTyko »

Hello
Lots of spare room in your tank now.
Looks Ace to me. <>+

Robert

Hans K
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Re: Early Tiger 1 from sPzAbt 503

Post by Hans K »

Nice work, now you kan hawe a verry larg soundspeker in the tank.

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cahlfors
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Re: Early Tiger 1 from sPzAbt 503

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Exactly! :angel:

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Re: Early Tiger 1 from sPzAbt 503

Post by cahlfors »

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. :D I was even able to chew a small, but steep hill, which I have had to avoid in the past. It was nothing! :clap:
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? :wtf:

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. :D There is plenty to do! :roll:

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Re: Early Tiger 1 from sPzAbt 503

Post by Hans K »

This tank running so naice in Borås, Thanks.

Hans K
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