Zippkits r4 and 21 setup

[tjsb]

I have both and cant get them to get over high 50s on 4s.I tried 2200 kv,2650 kv and 3050 kv motors and a all different props.

[Bande1]

you need good batteries and castle ESC's, and get your batteries over 100f. 70mph in a rigger is about 300A, 60mph is around 200A. KV is irrelevant you just prop up or down. Your batteries have to be able to produce the current first and foremost and most batteries only last 3-10 seconds before their IR shoots way up and their voltage starts sagging hard.

at the very least warm the batteries you have to 110f beforehand and keep the runtime under 30 seconds.

[tjsb]

WOW I was hoping for a lot more run time at those speeds.

Thanks

[Troy1957]

Running my r4 on sms 4000mah 150c. 3650 motor, raider 180amp esc. Getting about two and half minutes at 58 mph 4519 prop.

[Bande1]

Running my r4 on sms 4000mah 150c. 3650 motor, raider 180amp esc. Getting about two and half minutes at 58 mph 4519 prop.

at 150A, the absolute most generous current draw for that speed, run times are about 96 seconds.

Screenshot 2024-08-25 4.55.01 PM.png

150A / 60 minutes = 2.5 amps per minute with a total of 4 amps reserve. at the 60 second mark you are already below 50% depleted. In order to run 2.5 minutes your amp draw would have to be 95A max. which would be about low-mid 40's.

[Bande1]

WOW I was hoping for a lot more run time at those speeds.

Thanks

guy was running a P whiplash last year at 69mph on lap 4 the batteries caught on fire. they were SMC SRD's. data log showed 295A. voltage had dropped to 2.5v per cell causing them to swell and rupture. so consider those speeds as 2 lap time trial only. 10-12s laps for 2 laps or 1/3 mile.

here is a video of the nexgen rigger setting the 1/4 mile P limited record doing I believe 73mph

https://www.facebook.com/CincinnatiModelBoatClub/videos/571365687421223

[GeckoDragon]

Wow, that's it for run time? Granted, I've never run a rigger before, but even my big, heavy deep vee can do ~60mph speed runs for a solid 10 minutes. Very interesting

[tjsb]

would like to see that.60mph 10 minutes?

[Bande1]

Wow, that's it for run time? Granted, I've never run a rigger before, but even my big, heavy deep vee can do ~60mph speed runs for a solid 10 minutes. Very interesting

its basic math. at 3000w (60mph) / 14v = 214 amps / 60 minutes = 3.56A per minute x 10 minutes 35,600mah needed to run 10 minutes

what does the calculator show?

Screenshot 2024-08-30 11.49.12 AM.png

exactly the same. Even if by magic your wattage was half that, 1500w, it would still take 18,000mah to run for 10 minutes.

[lohring]

The SMC 6200 Mah 4 cell packs I run show around 32 realC at a 1 milliohm resistance. Note that the 250C rating is total advertising BS. Even so that’s a current of close to 200 amps. At 80% of the rated capacity that allows a full power run time of 1 ? minutes, enough for most racing. I haven’t noticed anything close to 140-degree F battery temperatures after a race, so I doubt I run currents that high for anything like 1 ? minutes.

Lohring Miller

[tjsb]

So I switched the battery and motor position and now they both are about 10 mph faster with less amp draw.

[EddieM41]

Pictures please

[tjsb]

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[tjsb]

How do you warm up your cells?