Scale speed

If you have a tank query and you can't find the answer anywhere else, post here. (TIP - Check for answers in FAQ, use the 'search' facility or even check this board before posting here).
Forum rules
If your question is electronics related please post it in one of the relevant boards here: viewforum.php?f=31
User avatar
Kaczor
Warrant Officer 1st Class
Posts: 1944
Joined: Fri May 18, 2018 9:58 am
Location: Ciechanow, Poland
Contact:

Re: Scale speed

Post by Kaczor »

Jimster wrote: Sat Jun 08, 2024 2:37 pm I get my kicks from trying to drive as realistically as possible. It drives me nuts to see an RC tank take off like a formula 1 race car and then stop on a dime.
Yep. bunny hopping (e.g. during IR battles) drives me crazy ;) But I could watch slow moving models whole day.
phpBB [video]
User avatar
Jimster
Lieutenant
Posts: 3088
Joined: Mon Dec 10, 2018 1:51 am
Location: Illinois

Re: Scale speed

Post by Jimster »

That’s an outstanding video! Thanks for sharing that.
User avatar
Herr Dr. Professor
Captain
Posts: 4073
Joined: Mon Apr 22, 2019 10:48 pm
Location: Southern Wisconsin USA

Re: Scale speed

Post by Herr Dr. Professor »

“Low and slow, mean and ?weathered??” I agree that tanks need to have smooth low low speed control. The HengLong 7.0/7.1 earned my respect for the low speed setting and control. The new CoolBank M5 is way too fast. I can use a very light touch to make it run slowly forward, but in reverse it’s way too fast.
RobW
Warrant Officer 2nd Class
Posts: 1178
Joined: Mon Sep 29, 2014 2:55 pm
Location: Sheffield

Re: Scale speed

Post by RobW »

Just a comment on the scale speed for boats etc. There are various correlations for wave tanks as speed is only one of the factors; surface area and drag are others. The ratios may even be (wave) tank related.

The other scaling is by Reynolds Number. Means we can test devices that should use high pressure air by scaling up and using water or occasionally sewing machine oil.

Thankfully I don't have to remember most of that now as we just use computer models :)


I quite like that the Coolbank M5 is silly quick, it livens the battlefield up. I am wondering how long the gear box and tracks are going to last though.
Meter rat
Warrant Officer 2nd Class
Posts: 1081
Joined: Wed Aug 05, 2020 7:33 pm
Location: By the sea in Argyle and Bute

Re: Scale speed

Post by Meter rat »

Thank you for the answers. S-O-G you must have read the same article as me, which had piqued my interest to start with, as it seems a simple formula, and wondered if it would work for other models, not just test boats in tanks. My own formula is. If it looks right to me. I hated the fact that my Tamiya Tiger was faster than my Challenger. Easy to correct, by using the slow button on the transmitter. Getting a realistic speed for the modern tanks is a bit harder. I do drive, as they say according to the conditions. Tiger, nice and slow, modern tanks, fast on road and and good tracks, and again slow and carefully on grass.
Fenrisian
Recruit
Posts: 1
Joined: Sat Jan 05, 2019 6:02 pm

Re: Scale speed

Post by Fenrisian »

one of my other hobbies is building RC boats, specifically fishing trawlers and tugs
I am really of the opinion that if it looks right it is right i.e. no bow waves or prop wash
same with tanks, it's a matter of learning to drive each model

Pete
Meter rat
Warrant Officer 2nd Class
Posts: 1081
Joined: Wed Aug 05, 2020 7:33 pm
Location: By the sea in Argyle and Bute

Re: Scale speed

Post by Meter rat »

Hello Fenrisian.
Thank you for the reply. I am of the same opinion. If it looks right.
I will say it before others do. We are a polite forum, and we like a proper introduction. May I respectfully point you into the introduction section, so you may give us a proper introduction, you skills, any tanks you have, or any you wish to purchase, and how you may contribute.
Post Reply

Return to “General Questions”