NEWS: WLtoys WL915 speed boat, the cheapest brushless RTR boat ?

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INTRODUCTION

After their first speed boat, i.e. the WLtoys WL913, WLtoys introduces here with WLtoys WL915 its little brother slightly shorter (44cm long) still in brushless edition with 3S system but now it includes an anticapsize system… the real drawback of the WL913 former edition.

BOX CONTENT

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+ 1 x WLtoys WL915 (with a 3S 1200mAh LiPo with Tdean connector)
+ 1 x Transmitter (using 4xAA batteries not included)
+ 1 x Charger
+ 1 x Spare props
+ 1 x M3 hex nut
+ 3 x Allen keys
+ 1 x Instruction manual (English)

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OVERVIEW

The general design is a classic speedboad with two lateral main floatting structure. The main novolty can be found on the left one… a serie of holes drilled on top associated with the new anticapsize system.

-Front view

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-Side view

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Three holes on front, two in the middle part …

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-Rear view

The left watertank is completly open on the rear side.

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The watercooling system input

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This cock permits to empty any waterleaks without removing all desk

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-Upper view

The rudder have a canopy immitating a motor. If the ruddler is not straight, it’s normal…. a consequence of the anticapsize dedicaced float.

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One of the two rear latteral upper desk locker

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-Bottom view

A curved tube sign of a flexible shaft

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The central desk locker

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-Weight

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669g in total

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3-in-1 module

A waterproof 30ESC + 2.4G + BEC 3-in-in module. I hipe 30A will be enough.

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The small 2.4G antenna.

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Motors

A 2815 outrunner motor is installed. No KV indication given…

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the coupler

The more important point to inspect regulary especially with a flexishaft. This part must be greased often to reduce extra friction. In the worst case, the shaft can break and your boat blocked in the middle of your water spot.

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From coupler to the flexishaft

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From motor to coupler

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Servo

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LiPo

A 1200mAh 3S LiPo with Tdean connector like all WLtoys models in general.

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Transmitter

The same radio chassis of all WLtoys RCboats. The Wheel is covered of foam. 4 trim buttons: 2 to tune steering, the last two for the throttle.

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UNBOXING & FIRST USAGES

Well my first contact with the WL915 as you can see was very disapointing. First of all the anticapsize system is not working in 100% of tje case. If you have bad luck, the boat can flipped but, instead of the dedicaced float to be filled by water, it’s more the other one who collect more water. Since this one can be fully filled, the boat can self-rotate….. I would say, during a run, the probability is low that happened since during a jump and/or flip both float will hit water and the dedicaced will be able to play its role at 99%.

After only 30-40s of “nomal” run… the boat started to not move and to sink mainly from the fron leftt side. It was really annoying. I believed an ESC problem or fast discharge battery … but it was not case. The first contact was a real fiasco.

In the second chance, I tried to played more with the throttle trim … and effectively this one if badly trimmed coz glue your boat into the water. In any case, the WLtoys WL915 need a couple of second with moderate front speed to “empty”/”display the mass of water collected in this left float. More you need to reach a nominal speed that let the front part to raise and by consequence to empty faster the waterbank.
Finally, after some trimming, the WL915 shows fully its potential…. pretty fast even if I am not sure it reaches 45km/h and turning rates are better than the WL913. It’s normal since any turn-fin are installed. As you can see also, the WL915 is relatively stable enven in wavy water conditions…. jumping a lot too. IMHO, a stronger/more pitchy prop should be installed to boost the boat at lower speed in order to empty/equilibrate the boat faster too and enjoy the full speed. The control range is pretty good, around 100m without problem. In case of lost transmission, the boat is stopping after 1-2s. The 1200mAh 3S battery offer around 8-9min of fun. At the end of each run, no big waterleaks were observed… it’s a good new when we see how the top desk is locked. In general I found the trimming a little bit hard to tune. For example, the rudder don’t have to tune straight to go straight at full speed..

CONCLUSIONS

The main advantage of the WL915 is without contest its price, a full brushless RTR model around 70 USD is a good deal in general. Versus the WL913, the WL915 have a relatively efficient anticapsze system too but the price is the lost in spontaneity during a throttle punchout. Here forget to race against another type of boat… the WL915 requires around 3-5s before to reach its top speed. The WL915 is also a little bit hard to trim in both steering and throttle.

PROS

+ Cheap RTR machine
+ Real brushless machine
+ Good control range
+ Waterleaks limited
+ Turning rates better than the WL913

CONS

– Anticapsize system, not 100% efficient in some situations
– Full speed not immediatly available
– Hard to trim
– 45km/h ?
– No LVC or RSSI alarm

RCgroups thread: http://www.rcgroups.com/forums/showthread.php?t=2624772

This boat have been courtesy provided by Banggood in order to make a fair and not biased review. I would like to thank them for this attitude.
You can find it actually for 72USD at http://www.banggood.com/Wltoys-WL915-2_4G-Brushless-Boat-High-Speed-RC-Boat-p-1041708.html

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