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
Great information! I picked up a couple of the RacerStar BR2406S 2600kv Motors based on your published numbers. That should really push my ParkJet around ;-)
ReplyDeleteHave you used any 3S Tattu LIPOs?
I was curious how those have performed if you have.
Thank for all the great information on your Blog.
Happy Flying!
GCRC
Thanks very much :) I have not used any of the Tattu 3S lipos, but I will be picking some up to test in the very near future. I have about 20 cycles on the 4S batteries now and they are providing excellent performance. I did notice that after about 12 cycles that the charge time has increased by about 15-20% as it seems to take a little longer for all the cells to balance. I have been "babying" these batteries, I always charge on balance at 1.5A and always put them in storage charge right after use. I have been very impressed with them however and the Gens Ace 2200 3S batteries I used. I believe they are made by the same parent company. A bit more expensive than some other batteries, but thus far the price has been worth it in field performance :) Thanks again and Happy flying to you as well :)
DeleteCheers,
Scott