Battery

[Clockman75]

I rcently purchased a t6 Texan, the online info listed it required a 4 cell battery but the instruction says to use 3 cell. Can I use a 4 cell safely?

[xviper]

You need to tell us which one you got. There's the Eflite one and there's the Dynam one. The Eflite one "might" survive 4s. The Dynam one, might not. Neither one is listed as a 4s system. Also, what "online info"? In the product specs, both say it takes a 3s battery. Using a 4s battery would void any warranty and would be at the owner's risk.

[fhhuber]

If its the Dynam... which motor and ESC does it have?

I have done some testing and there are some of their 3S recommended planes that can handle 4S direct drop in without even changing the prop.

The 1200 mm P-51 is one. (and most of the rest of that series that say 3S can use 4S)

The Spitfire uses the same motor and ESC... but no room for the 4S.

[xviper]

The Dynam has 30A ESC and the BM3715A-KV1050 motor. Eflite has a 40A and a 950kv motor. I fly their Opterra with a stock 40A and stock 1300kv on 4s with great success. The Dynams that I have that are stock 4s have 40A and 650kv motors.

[fhhuber]

I haven't had the Dynam 3715 1050 to test. I think I have all the other 3715's

I'd expect it to handle 4S, but can't say if it needs a prop change to keep current within limit for the ESC.

The Dynam models in the series that specify 4S (not EDF) typically have 3720 series

[Ole-Timer]

If your talking about the Eflite AT-6 forget a 4s battery

I ran some amp tests.
On 3s it comes in at 41amp wot.
On 4s it eats a whopping 65amp wot.
The little 15 980kv motor takes a beating and anything past 45amp on 4s makes it really heat up rapidly.
At 55amp n up it’s cooking itself.

Mine is modified to run 4s and it rocks now!

If it’s the Eflite AT-6 follow the thread further down the list...
its all there...

[xviper]

It's too bad that people who ask these questions don't give details as to exactly what it is they want the answers for. We're just talking around in circles speculating what plane is being referred to. :wacky

[fhhuber]

When changing voltage (3S to 4S is 3.7v increase, from 11.1 to 14.8 nominal) you often need to change prop to control the amps. You can almost double the watts by that change if you use the same prop.

Just randomly changing voltage without testing is not recommended, because its an easy way to have your airplane catch on fire while in flight.