Dynamic S

A review of the Dynamic S Racer power assisted glider from HobbyKing and mods. I will include some modifications I think it needs too. The Dynamic S is a Plug-N-Play, requiring only your own receiver and Lithium Polymer battery pack. It forms the backbone of a new United Kingdom racer class that HobbyKing are promoting. Constructed of EPO foam and reinforced with carbon strips within the fusleage and wings.

 The model delivered to my door came in a sturdy box and the items were quite well packed. There was a pre-assembled fuselage with ESC, motor and folding prop installed. Wings had their aileron servo installed also. There was a bag of plastic items which secure the V-Tail fins and also the main wings plus a carbon tube, well not exactly a tube but of square profile. A bag of screws for the latter included, plus a bag containing an allen key and some foam adhesive A manual for assembly and a roll of nicely printed self adhesive decals. After speed reading through the manual twice I think I had got the general idea on the sequence of assembly. I reckoned on about an hour and half to assemble.

The 35mm motor is a brushless type supposedly 920kv and I was unable to find out it's true specifications but from what I could see on it's construction probably 300 watt. The ESC is quite small with light blue open heatsink. There was no info on the ESC of it's capacity and I really did'nt expect any but is advertised as 30amp. One thing I found odd about this ESC was there was only one decoupling capacitor and next to it a rather dodgy looking resistor I have not seen since microchips took over from transistors on large circiut boards. I can only speculate that this ESC is just capable of 30 amps. See test results below.

Gallery

Fitting the V-Tail. To complete this task you are required to remove the servo arms from the servos and let them hang loose. The tails bases fit on on top of the other (they only fit one way) and this is a bit of a fiddle as you have ensure the servo leads are pushed well forward so the bases engage in the fuselage completely. Now you can fit the plastic tail support over both tail bases (the servo spindles will appear through pre-cut holes) and then the whole tail assembly can be secured with the provided self tapping screws. I temporarily pushed the servo arms back on at this point to keep things tidy. No point in fitting them properly until the power is on and the servos centred!

Wing Assembly is simple enough. I always check the depth of the wing tube inside the wing first just in case the carbon rod is slightly too long. Simply slide the tube into one wing first then the other till they butt together neatly. The idea of a square tube is extra strength and anti-rotation apparently. There are two more plastic plates that simply fit top and bottom side of the assembled wing and secured by more self-tapping screws. The wing is secured by two machine screws to the top of the fuselage. The aileron servo leads connectors not standard as such. One servo has a female plug and the other servo lead a male. I suppose this to make them handed!

Finishing Off. Included is a large roll of decals, self adhesive. to see where they supposed to be take a look at the box, you didn't throw it did you? The decals peel off the heavy duty backing so take care when peeling off, keep good hold of the decal until you are over the spot where you wish it to be. I choose to use all of them, but you could leave some off and add your own or maybe some fluorescent Solar Trim to jazz it up!

An Oversight? The aileron servos have thin plastic covers over them and to be able to adjust the ailerons surfaces you will need to make a hole in the sides of both. I used a soldering iron to punch a hole in the covers. Why the factory or designers overlooked that owners at some time or other would need to adjust the neutral positions of the aileron and therefore the rod length so beats me why they did not think of that!

Flight Test - Results

The glider was maidened on a mostly sunny day with a 5 mph breeze. It was fitted with the recommended 1800 maH LiPo, in this instance a GensAce 3S1P. Thr glider was launched into the wind and climbed out easily on two thirds throttle, full throttle not being needed. A good sign! Flat out it was quite fast, although no hotliner. Cut the power and turn it into the wind and it floated easily and at very low airspeed no tendency to stall and dropa wing tip. It was flown at various throttle positions for about 8 mins and then landed. Coming in it was floaty and you just have to wait for it to settle before touchdown.

The battery was found to be only slightly warm but the ESC appeared warmer, yet max throttles had not been used that much. This seemed the norm after a few more flights.

Using a test meter with a fully charged pack the motor was drawing 25 amp at WOT approx 265 watts being displayed. As I said earlier the ESC looks rather weak and some users on the forums have reported burn-outs or brown outs.

Not being one to chance a brown out due to ESC failure I have replaced the ESC with a HobbyWing Pentium 40. (See image 3 in Gallery) With 25 amp draw at WOT this ESC will handle all that is required including a motor upgrade in the future if desired. However, at the end of the day this is a Power and Glide model and should be treated as such.  I have not tried a 4 cell Lipo although with the larger ESC capability should make this more of a warm to hotliner.

Pros:

  • Factory assembly good
  • good to fair value in my estimation
  • Quite quick, especially when cutting across the wind.
  • Sport Fun on the cheap

 

Cons:

  • ESC a bit dodgy looking and probably near max capacity when using WOT.
  • Not for beginners, to much aileron and it will bite back. not much room in cockpit to locate the ESC nicely. (You have to keep moving it to one side to insert battery)
  • Not a thermaller as such

Conclusion

For a chuck-n-go this is good value for money.  Quick to assemble at the field.  Fits in most cars.  Quick enough for fun and thrills.  Not for beginners though.  Can be flown around for some time on the recommended battery size with easy use of throttle.  I would'nt say I just love it though but when time is tight and wanting some stick time then ideal then I like it.  THe wing tips though become little ears after some time so I cut mine off, making it look a bit more tidier.

*Discontinued on Hobbyking

 

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