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H-King Marine Relentless V2 Racing Boat ARR

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H-King Marine Relentless V2 Racing Boat ARR

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When it comes to brushless R/C boat action, more speed equals more fun! 

The H-King Marine Relentless V2 (and its cousin the Scott Free Offshore Racing Deep V Boat) are the flagship products for the new H-King Marine line of RC boat products.  The ultimate Catamaran Racing Boat offering high speed, excellent handling and killer good looks just got better with this V2 version. The vibrant red paint scheme and expertly applied racing decals are sure to turn heads wherever you go!

A potent water cooled brushless power system comes pre-installed providing extreme power to the new three-bladed metal prop. The motor is a brushless outrunner which produces massive amounts of torque urged on by two 7.4V 4000mAh LiPo batteries to reach speeds above 60 km/h. This allows the boat to get up on the plane almost instantly upon hitting the throttle. The precision machined alloy rudder and pre-installed high torque steering servo makes for crisp steering response and keeps the boat upright during hard cornering. 

The hull is constructed from lightweight yet durable ABS - this is where the Relentless V2 differs from the other boats. The hull has a beautifully painted gloss finish just like fiberglass, yet it's offered at a much lower cost. The decals are applied before the final clear coat, sealing them from the elements and providing a top quality look.

This boat will be ready to run in about 10 minutes after opening the box thanks to the high level of pre-assembly. You will simply need to bolt on the rudder and propeller, connect the steering linkage, install your receiver and you're ready to go!

We thought the Relentless V1 was awesome when we first sailed it but the V2 operates on a whole new level. Looks, Speed and Agility! Sums up the Relentless V2, you’ll love it!

For a full set of spare parts click here

• High-performance water cooled brushless power system
• Vibrant race-inspired paint scheme
• Lightweight ABS hull
• High torque steering servo
• 4mm direct drive flex shaft
• Powered by a 2 x 2S 4000mAh 30C+ Lipo battery packs (sold separately)
• Almost Ready to Run - simply add your own radio system and batteries

Overall Length: 730mm
Hull Length: 650mm
Beam: 209mm
Weight: 1305g (w/out battery)
Motor: Water cooled 2815 brushless outrunner (included)
ESC: 60A water cooled brushless (included)
Servo: High torque standard size (included)
Hull Material: ABS
Propeller: 3 bladed metal

H-King Relentless V2 Brushless Catamaran Racing Boat (ARR)
All necessary hardware
User Manual
1 x propeller
HXT4mm plug

2CH transmitter and receiver
2 x 2S 4000mAh 30C+ Lipo battery



  • H-King Marine Relentless V2 Racing Boat ARR
  • Relentless V2 on 6S
  • H-King Marine Relentless V2 Racing
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Jack | Verified Buyer

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Good while it lasts

Jun 15, 2017

Good fun boat especially to learn with, this was my first boat and it's fun, cheap but also nasty,
The boat is fast for the price, but handling is somewhat mediocre, on glassy water and if it's tuned properly this boat can hold its own, any form of surface disturbance and that's when this cat becomes very unsettled. Especially at high speeds. You will learn fast how to drive this boat, and I wouldn't recommend buying it if you don't want to go swimming to retrieve it from the middle of the lake.

Handling aside. The electrics are of a average quality. But tiding of the wires is required. I changed the connectors to a better quality.
My biggest issue is the strength of the hull. 8 runs down I'm experiencing stress fracturing of the hull. Do remember that this boat is being run on a glassy smooth lake. With the only turbulence being what's made by the boat itself.

It was all going so well until these hidden gremlins exposed them self.
Just remember, you get what you pay for!

Guillaume07 | Verified Buyer

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Customer Rated

Aug 10, 2016

très beau modèle, finition très bonne, le seul petit détail est le jeux important dans le servo de direction. A part cela tout est parfait

Micha | Verified Buyer

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Customer Rated

Aug 09, 2016

A very fast and good boat .
It does best without waves and wind .

The only thing that bothers is that it may capsize and then is possible , in the middle of the lake .
Otherwise I can only recommend this boat .
A note : Tucked the cables inside the boat always good and makes sure that they do not come to rotating parts!

michael | Verified Buyer

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Customer Rated

Jul 30, 2016

The boat is not stable unless the water is like glass. ThIs is common with cat boats but boat flips on acceleration on calm wind free days too. I wish I got the Scott free instead. Seems bether and more stable.

Satho | Verified Buyer

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Certified Buyer Rated

Jul 23, 2016

The HK Quanum Relentless is my first RC Boot.I tried this Product because of the nice Price.The Quality is really good, also the hardware.The Speed is very good and it makes fun to use.

Cadsbury | Verified Buyer

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  • Overall

Customer Rated

Jun 30, 2016

This is a cool boat, but need a little refinement. I had some Nano-Tech 2s 5000mah 65-130c pack around so used them for the maiden. At first the boat just poked around with the prop cavitating. As it picked up speed and started to get out of the water, the fun began. This boat really get after it. I'll try sharpening the prop and just ordered some 4000mah packs to hopefully lighten it up a bit. Will post an update after the weekend with the new setup.

| Verified Buyer

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Certified Buyer Rated

May 04, 2016

nice ARR item like first boat

actarus12 | Verified Buyer

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Customer Rated

May 01, 2016


SmooveG | Verified Buyer

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Customer Rated

Apr 27, 2016

Nice little boat. As mentioned by previous buyers, I didn't find a spare Propeller in the Box either. Instead of the mentioned XT60 plug there were two HXT 4 mm plugs as seen in the last picture. The user manual provides little spec's about motor or esc.
Make sure to check all screws before first run.
To bad the water cooling system for motor and esc aren't separated. Will have to do so myself. Oh and a antenna straw would have been nice to.
Propeller and motor came pretty well balanced, almost no adjustment needed.
Overall it looks great. Can't wait to try it out.

jm.engineering39 | Verified Buyer

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Certified Buyer Rated

Apr 25, 2016

If you want high speed Water thrills this is the boat to do it ! Another fantastic HobbyKing product noe upgraded from the V1 design the New V2 has improved internal arrangements with better battery mounts etc.. when racing with friends these Relentless are fast stable and so much fun ! I have had a V1 foe 2 years and now have the V2 alongside 3 of my friends ! we can't get enough ..

Customer files
Relentless V2 Manual Download [2098]
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