Gens ace 2200mAh 3S 25C Review and Testing

Since the Gens Ace 2200mah 3S 25C batteries were on a significant sale recently, I picked up two to do a bit of testing. I spent a couple of days gathering data, and here are the results.

To give a bit of background, I am a multirotor pilot, and am primarily interested in miniquads. That being said the testing I’ve done applies universally, and the 2200mah size battery is very adaptable to general use in mini quads, 450 class multirotors, small helicopters, and airplanes, RC crawlers etc.

For this test, I’ve done some stress testing and general data collection with this battery, and for comparison purposes a Turnigy 2200mah 35C as well. I began by testing the internal resistance of the battery. I also did a current draw test on both batteries at 25A to measure the voltage drop. Finally Irecorded a flight with an onboard current and voltage sensor in the OSD to demonstrate voltage drop in real-world flight conditions.

Physical Characteristics

My first impressions of this battery are very positive. The battery is very solid and well built. There is a very thin aluminum support that surrounds the battery and adds additional protection to the top, back, and bottom of the battery. This protective layer doesn’t extend down the sides however. Where the high current lines enter the battery casing they are re-enforced with additional heat shrink. The balance leads come out the opposite side of the casing rather than the same side as the high current lines. This battery did come with 4mm bullet connectors, which I had to cut and resolder to my standard XT60. The battery weighs in at 190g with the factory connector and 187g after being modified with the XT60.
 
Internal Resistance
As a first test I measured the IR of the battery in several conditions. I tested at both full voltage, storage voltage, and full discharge after a flight. I used this tool to estimate the C rating and constant average amp draw for the battery. It is worth noting that the post flight battery was quite warm, and that does effect IR quite a bit.

Scenario (GensAce) …….. IR(mOhm) …….. Amps(avg) …….. C(avg)
Full Charge (75F) ………………. 3.3 ……………….. 63 …………………. 29
Storage Charge (75F) ………… 3.2 ……………….. 64 …………………. 29
Nominal Charge (95F)……….. 2.8 ……………….. 69 …………………. 31

As you can see all of the average C ratings were well above the listed 25C rating from the factory.

For comparision here is the data for the Turnigy 2200mah 35C battery.

Scenario (Turnigy) …….. IR(mOhm) ……..Amps(avg) …….. C(avg)
Full Charge (75F) ………………. 3.5………………… 61 ……………….. 28
Full Charge (95F) ………………. 2.2 ………………..71 ………………… 35
Storage Charge (75F) ………. 3.4 ………………. 62 ………………… 28

Load Testing

I wired the battery up to a 25A load to test voltage drop. At the top of the battery the voltage dropped mostly linearly at a rate of 0.03V per A. That leads to a projected drop of 1.5V at a 50A load.

The flight video shows a voltage drop of about 1.7A at 50A which is very close given the drop in efficiency as the current increases. The battery was cool to the touch after 25A (1C) tests, and only slightly warm after flight testing. Load handling appears to be consistent with the projections based on IR measurement. Flight times are around 5 minutes on my Cobra 2204 2300kv motors pushing 5×4.5 bullnose props with punchouts drawing 50+ amps and average flying drawing 15-20A.

For comparison, the Turnigy battery performed basically the same with a 0.0325V per A drop.

Conclusions
These batteries are very well made and seem to be well rated, meeting or exceeding the factory 25C specification. Time will tell if that C rating drifts after regular use and abuse, but from initial flight tests, I am optimistic. The weight and size are better than many other 2200mah batteries as well, which works out well for miniquads. Overall I am impressed with the quality and performance of the battery and am looking forward to some long-term results. For those interested, the battery is available here: https://www.ampow.com/gens-ace-25c-2200mah-3s1p-deans-lipo-battery.html

1/10 4wd Losi Rock Rey Review

losi rock key

Based on the Losi® Rey® platform, the 1/10th 2.2 Rock Rey rock racer takes no prisoners. It embodies everything drivers love about the desert and rock racing culture, and features a new cage and bodywork that looks just like the full-scale vehicles. This rock racers new front-end geometry adds the needed handling for racing while taking advantage of the Baja Rey rear-loading battery, bottom-loading motor, brushless power and an AVC® precision driving system. From rocks to water to mud, you’ll experience next-level awesomeness, drive after drive.

Realistic 4WD Chassis with Long-Travel Suspension
The Rock Rey chassis is a brilliant blend of scale realism with functional 4WD capabilities. The foundation consists of a 3mm, aluminum chassis plate that is integrated with a realistic roll cage made of super-tough composite material. To this it adds a long-travel, independent front suspension and 4-link live rear axle that look and function exactly like their full-scale counterparts.

LED Light Bar
The fun doesn’t stop even when the sun goes down with the Rock Rey™. Twelve brilliant LEDs on the integrated light bar cast more than enough illumination for running at night. Plus, the body-mounted LEDs place only a small demand on the battery allowing you to stay out all night!

Dynamite® 2800Kv Brushless Power System
The vehicle comes equipped with a Dynamite Fuze™ 2800Kv brushless motor and a waterproof 130A ESC. This potent combination can handle 2S or 3S LiPo batteries (sold separately) and will allow you to hurtle across the landscape at speeds of up to 40+ mph.

Sealed, Heavy Duty Metal-Gear Transmission and Diffs
The transmission, as well as the front and center diffs, are sealed against the elements and engineered to handle the abuse of a high-output brushless motor and punishing terrain. MOD 1 gears further increase the durability of this off-road beast.

Coil-Over Oil-Filled Shocks
The long-travel shocks do a fantastic job of soaking up the energy from big bumps and jumps. They also feature threaded shock bodies with adjustment collars so you can fine tune the pre-load settings of the coil-over springs. External bump stops on the rear provide plush landings on the hardest surfaces.

Waterproof Electronics
The Rock Rey™ Rock Racer is loaded with waterproof electronics including the receiver, servo and ESC. Everything is sealed against the elements allowing you to splash in the rain, spin in the mud and make tracks in the snow. It’s full-throttle freedom to run anytime, rain or shine.

Easy-Access Motor
The unique design of the chassis allows the Dynamite® 550 6-Pole 2800Kv brushless motor to be accessed without difficulty. Drivers simply remove three screws in the bottom of the chassis and they can then effortlessly make gear changes and service the motor.

Easy-Access Battery Compartment
To help withstand the trials and tribulations of off-road driving, the Rock Rey™ Rock Racer was built on a durable anodized aluminum chassis with a bottom load battery compartment. Quickly and easily make battery changes without removing the body or wrestling with battery straps.

Bolt-On Body Panels and Detailed Interior
The bolt-on body panels are incredibly durable and eliminate the need for body posts that might spoil the scale looks. You also get a molded interior that includes a driver and rider figure, both of which sport racing helmet and harness details.

2.2” x 5.8” Maxxis Creepy Crawler LT Tires
Excellent scale looks while providing an aggressive tread for all-terrain applications.

Molded Roll Cage and Driver Figures
The molded roll cage and driver figures provide even more scale looks and extra durability.

Spektrum™ SPMSRS6000 AVC Receiver
With the SPMSRS6000 AVC Receiver driver’s get stability control for ANY vehicle in their collection! You can have the stability control of AVC™ (Active Vehicle Control) technology in any vehicle just by adding the SRS6000 receiver and binding it to an AVC compatible transmitter.

Bind-N-Drive™
Bind-N-Drive™ (BND) is a transmitter-less option for RC enthusiasts who already own a surface transmitter featuring Spektrum 2.4GHz DSM Technology. This money-saving innovation allows you to add a Bind-N-Drive vehicle to your collection without the extra cost or clutter of an extra transmitter.

The Full-Throttle Freedom of AVC® Technology
When you’re ready to let the brushless motor off the chain, don’t hold back. The receiver’s built-in AVC (Active Vehicle Control®) system will work behind the scenes, making hundreds of tiny throttle and steering adjustments per second, so more of the motor’s power is translated into ballistic speed and acceleration instead of just flying dirt. An AVC adjustment knob on the included DX2E transmitter lets you adjust how much traction control the system provides. You can even turn it off.

Features:

  • Realistic Rock Racer chassis design
  • 3.5mm hard-anodized aluminum chassis plate
  • Integrated chassis roll cage
  • Dynamite 2800Kv brushless power system
  • Spektrum™ AVC® technology
  • Long-travel suspension
  • 4-link live rear axle
  • Waterproof electronics
  • Sealed, metal-gear transmission and diffs
  • Coil-over, oil-filled shocks
  • Easy-access battery compartment

What’s in the Box?

(1) Losi® Rock Rey® BND 1/10 4WD Rock Racer
(1) Spektrum™ 4-Channel DSMR® AVC Surface Receiver
(1) Spektrum™ 9KG 23T Waterproof Servo
(1) Dynamite® Fuze™ 130A Sensorless Brushless Waterproof ESC
(1) Dynamite® Fuze™ 550 Brushless Motor 3800Kv
(1) Product Manual

Specifications:

Type: Off-Road
Scale: 1/10
Length: 20.75 in (527mm)
Width: 12.75 in (323.8mm)
Height: 8.75 in (222.3mm)
Ground Clearance: 2.2 in (55.9mm) at rear diff
Wheelbase: 15.0 in (381mm)
Weight: 6.55 lb (3.0kg)
Chassis: 3mm Aluminum
Suspension: Independent front / 4-Link Rear
Drivetrain: 4WD
Tire Type: Desert Wheel 2.3 in
Motor or Engine: Sensorless Brushless Motor
Speed Control: 130A Sensorless Brushless
Radio: Sold Separately
Speed: 40+mph
Gear Pitch: MOD 1.0
Wheel Size: 5.75 in (146mm) Tire Diameter
Kit/RTR: BND
Shock Type: Oil-Filled/Coil-Over Spring
Body: 4 Piece Screened body
Ball Bearings: Full
Assembly Time: Less than 1 Hour

Needed to Complete:

  • SMR compatible, 2+ channel, surface transmitter
  • One 2 or 3 cell, 5000+ mAh 30C LiPo battery with EC3 connector
  • Appropriate LiPo charger

LOS03026 – MSRP $449.99
Due Early November, 2018

2018 Maverick RC Strada Brushless DT Review

2018 is a big year for Maverick RC. As HPI Racing’s entry-level line-up, Maverick is working hard to make a big impression here in the states. We’ve been bashing and thrashing their Strada Brushless DT for several weeks now. With a bold brushless power system and a nice scale roll cage, how did it stack up? How fast did it go? What did it break? Read on to find out…

From: Maverick RC
Direct Link: Strada Brushless DT
Unboxing Pictures: Big Squid Unboxes the Strada Brushless DT

Review By: Cubby
Pics By: Tim Mohr

Specs:

RTR or Kit: RTR
Age: 14+
2wd or 4wd: 4wd
Shaft or Belt: Shaft
Electric or Gas: Electric
Waterproof: Yes
Scale: 1/10
Length: 470mm
Width: 260mm
Wheelbase: 270mm
Weight: 1.75kg
Motor: MM-22BL 3215kV brushless
Speed Controller: MSC-30BL-WP brushless
Low Voltage Cut-off: Yes
Radio: MTX/MRX-243 2.4GHz
Differential: Two gear diffs
Slipper Clutch: No
Driveshafts: Metal bones
Shocks: Plastic bodies, oil filled
Servo Saver: In steering rack
Screws: Phillips
Spur/Pinion Pitch: 48
Bearings: Yes
Tires: Maverick off-road tread
Battery: 6 cell NiMH 3000mAh
Part Number: #MV12628
Warranty: 90 days on components

Bashing Specs:

Front wheel travel: 1.4″
Rear wheel travel: 1.2:
Wheelie on demand: No
Backflip off ramps: No
Stability Control: No
Sound Module: No
Self-Righting: No
FPV: No
Top Speed (measured by BSRC): 26 mph
Runtime (measured by BSRC): 14 minutes
Street Price: $215

What’s Needed To Complete: All that is needed to get the Maverick up and going is four AA-sized batteries for the transmitter. A NiMH battery and charger are supplied for powering the DT.

Build Quality: We couldn’t find any build issues with the DT. All the bolts were tight but not stripped, the shocks were well built, the gear mesh was fine, etc.

Test Drivers: Robbie G., Sam The Noob, T-$$$, and yours truly.

Test Venues: The parking lot of our local Costco was used for pavement driving and measuring top speed. The rest of our testing took place at two local city parks.

Set-up Notes: We ran the Maverick bone stock, including its NiMH battery. We did skip the included wall charger in favor of Hitec X1 Pro.

How It Drives: We found the DT to be a solid handling buggy, but it has a LOT of steering in corners. We found that the front would usually stick quite well, but the rear was loose as a goose. The rear being loose helps in tight corners where you want a lot of rotation, but can make the DT hard to handle in fast sweepers. Also, the rear remained loose after corner exit. In fact, the rear felt looser after apex than before.

Even with so much steering, we didn’t find the DT hard to drive in a straight line. It drove quite straight and rarely needed steering trim adjustments. The shocks and suspension geometry worked well over rough ground, as well as on jump take-offs and landings. The suspension is slightly on the soft side, but that helps for gaining traction on loose surfaces.

Overall, we found the buggy handled well. On dirt, grass, and pavement, we had a great time with the DT. The only downfall we found was in sand. The tires on the DT are quite a bit smaller in diameter than a normal 1/10th SCT/SCB tire. This caused the DT to easily get stuck in sand that we are accustomed to gliding over with other 1/10th sized vehicles.

Power: Oh yes, how about that brushless power system? No, it didn’t put out crazy power for a brushless system, but it did put out more than a standard brushed motor. We noticed some cogging right off the very bottom, then it give a good kick in the low end. The power system easily blew through its mid-range to a top end that was limited by its gearing and NiMH battery. Out of the box the power system is about right for first time drivers, but throwing a few more teeth on the pinion will surely unleash the beast.

Radio: The included radio has a wild/futuristic look to it and performed flawlessly for us. Range was more than we ever needed and our test unit never experienced a glitch. Also, we found it quite easy to make adjustments without the need to look for the manual.

Broken Parts: Maverick has a reputation for using durable plastic and that’s exactly what we found on the DT. We were able to beat and bang on the thing without much worry about breakage. We did manage to rip one of the rear hinge pins out, but goodness knows we beat on it fairly hard before it finally broke. Furthermore, while not broken, we did manage to tweak a couple of the wheels, and one of the wheels came loose early in testing (we caught it before the hex was stripped).

Misc Notes:

The “body” comes off the DT by removing 4 body clips. That’s totally standard, but after that things are a bit different. You pull up the roll cage on the rear and the entire thing pivots forward.

Speaking of that roll cage… The front of the roll cage interfaces with the front body posts to help dissipate hard hits. We liked how the cage pivoted forward, thus making the DT easy to work on.

We dialed in a bit of negative camber on the rear of the DT and added more pre-load to the front springs. This made our DT much easier to drive in the corners.

Best Mods: We are going with taller tires. Slightly taller tires will help the DT get over rough spots, plus it will give the DT taller gearing for more rip.


Summary:

A = Outstanding/Best in Class, B = Above Average, C = Average, D = Below Average, F = Horrific

Time To Bash: B The Strada DT was quick and easy to get up and running.

Workability: B Working on the Strada DT was easy, but hex hardware would have been preferred.

Car Show Rating: B Our all test drivers liked the looks on the Maverick. Its body had nice graphics, it had a very nicely detailed roll cage, plus it even had a detailed interior. The wheels and tires also looked good on the DT.

Bash-A-Bility: B We gave the Stada DT a solid bashing and it didn’t break many parts. With flexible plastic and a solid overall design, it is ready to bash.

Fun Factor: B We had loads of good fun hucking the Strada DT over ramps, blasting through wooded areas, and doing general bashing with it.

Handling: B For a straight up bash machine, we found that overall the Strada DT handled well. From speed runs on pavement, to trails at the local park, the DT’s suspension generally did a fine job.

Value: A The Strada Brushless DT is a great value in our eyes. The DT has a very affordable price point for the amount of fun that we got out of it.

Parts Availability: C While we didn’t find any parts locally, they were easily found on Amazon.

BigSquid Rating: B The Maverick Strada Brushless DT is an affordable desert rig that is spot-on for new drivers. It drives well, plus it has plenty of capability for upgrades in the future. Yes, we can recommend it to anyone looking for an affordable brushless ready-to-run.

The source from: https://www.bigsquidrc.com/maverick-strada-brushless-dt-review/