Tattu R-Line 1550 4S 75C batteries initial impressions and testing

Hi Everyone -

I received a couple of Tattu R-Line 1550 4S 75C batteries in the mail a couple days ago to experiment with some serious speed in my park jets😀

These batteries have a very good reputation from what I have read and watched on YouTube, they were not cheap, but I only bought a couple for some experimentation and serious speed fun!

I went with this small size as I didn't want to pay a big weight penalty, so even though my flights will be short, they should be fast😉  The batteries weigh 186 gr/6.6 oz.  The normal 2200 3S batteries I use weigh 192 gr/6.8 oz, so my planes should still be pretty light to help them be fast. 

I already did some quick testing for a modified RC Powers Su-30 V4 I am building specifically for speed.  Here is a short video I shot discussing this testing.  You can watch more about this special build by going to this playlist on my YouTube channel.

As discussed in the video, the only successful test was with the EMAX RS2306 2750 kv motor using the 6x3 EMP prop and the HobbyWing Platinum PRO 40A ESC with custom settings of 26.25 degrees timing and 8 KHz PWM frequency.  You can see the full details on my motor test spreadsheet, but here are the numbers for the combo I mentioned with this new Tattu 4S battery.

50% throttle - 21.8A/346.5W producing 940 gr/33.2 oz of thrust;

100% throttle - 54.8A/860.2W producing 1630 gr/57.5 oz of thrust.

WOW!  That is a 45% increase in thrust over the best mid range power on 3S and 36% increase at full throttle!😲

Until my 5" props that I have ordered show up, this is the setup I will experiment with.

Here are the 5" props I have ordered based on watching rcplanepirate's video on his testing of the EMAX RS2306 2750 kv motor and his personal recommendations. I pasted this list in from the comments of this video.

Hobby King

HobbyKing 5040 GRP/nylon prop https://hobbyking.com/en_us/glass-fib... Dalprops "Indestructible" Bull Nose 5045 V2 https://hobbyking.com/en_us/dalprop-5... Diatone Bull Nose Plastic Propellers 5 x 4.5 https://hobbyking.com/en_us/diatone-b... Banggood DALPROP 5045 Bullnose PC Propeller https://www.banggood.com/2-Pairs-DALP... Gemfan 5045 5 Inch Propeller Bullnose https://www.banggood.com/4PCS-Bullnos... KINGKONG/LDARC 5040 Propellers https://www.banggood.com/10-Pairs-KIN...

So I am excited to get to the field and start experimenting with these new batteries and this setup in a plane, it is going to be scary fast!😳

Park Jet noise...the "other" sound of freedom😎

Cheers,

Scott