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Old Nov 06, 2012, 03:54 PM
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V939 Beetle Review

I've taken my review thread and bloggified it: http://www.rcgroups.com/forums/showthread.php?t=1765484

Mini Beetle on top of its bigger brother (which has a Mickey D's shake lid as a protective cover):



In front of it:



Along with my precious corter:



Main motor from V911\9958 compared to V939 lengthwise:



939 has a smaller diameter than the V911 main motor:



Still thicker than the V911 tail motor:



Battery Tray:



PCB:



Video to come

Inside flight is best on 60% for me. 40% doesn't have enough rudder speed. The left top button is to adjust the rates while the right button when hit, makes it flip. This is really nice and I may try this TX on the V929, although just after two flights with my V939, my V929 may start collecting dust. The propellers are the model of what I would like to see on all my heli\multi rotors. They seem to be very rubbery, which will be great fighting abrasion.

The best thing I like about the V939 so far is that there are no gears to have to worry about getting out of alignment.....simpicity at its best. The spars seem to be the same thickness as its bigger brother. I really don't see breaking anything on it anytime soon, but then again I haven't done outside flight.

The batteries get pretty warm and it seems like they are slighly puffy after a run. It may be worth it to pick up some higher C-rated and\or higher capacity batteries. I bought an 808 keychain cam from Banggood, but I may hold off until I get a better battery.
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Old Nov 06, 2012, 03:54 PM
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United States, FL, Melbourne
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Video is up:

New WL Toys V939 Beetle from Banggood.com (3 min 17 sec)


I like the bee buzz sound
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Old Nov 06, 2012, 03:55 PM
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There's enough spare room in my existing V911 carrying case to accomodate the V939:

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Old Nov 06, 2012, 03:55 PM
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808 Battery eliminator mod pics as promised:

E-Flight connector added:



E-Flight added to RX board:



Temporary mounting scheme until I can rig something more solid:



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Old Nov 06, 2012, 03:56 PM
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Well, some more progress. I wanted to lighten the camera some more so that the stock battery could cope with the additional weight.

Here are some weight measurements:

The internal battery is nearly 5 grams:



The Camera board is 5.6 grams:



The housing is another 5.2 grams:



I gutted the housing, shaving another 2 grams off it it and covered the open areas with foam (not shown in the picture but I used even lighter pink foam my motherboards come packed in):



The good thing is that the stock battery can cope with carrying the lighter camera better, and the rectangle I cut in the housing makes for a good mating to the underside of the stock battery holder. Before doing this, securing the camera was difficult as the casing was too slippery. Unfortunately the stock battery can't keep enough voltage to keep the camera running. A stock-sized battery with a higher C rating may work, but I just put my 600 mAH Turnigy Nanotech back in, which supplies plenty of juice to run both.

I also added a second E-Flight connector to the RX PCB so I don't have to jam the JST connector into the stock RX connector. An added benefit to this is that I can now use two of my V911 batteries in parallel if I want to:



The two weigh a little more (EDIT: they actually weigh less, I got my pictures confused, and actually seem to have more punch together than the stock 300 mAH battery (their both 130mAH Turnigy Nanotechs):






I can power out of any wobble\instability with the 2 Turnigys, whereas the stock battery just didn't have the umph to come out of it. Of course I'm sure once I get my 300mAH Nanotechs I'll experience the same thing, but it's nice to be able to reuse my other batteries.

Took her for her first outdoor flight with 808 mounted:

V939 First Outdoor Flight, 808 Keycam video (2 min 25 sec)


First crash is from a flip.
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Old Nov 06, 2012, 03:56 PM
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I may be selling my V911 and V929. You guys know how much I loved my V911. I lost interest in my 929 after a few days. I flew my 939 tonight and had a blast with it. It actually flies great at night because I can easily tell what it's doing and which direction it's going from the lights. I love the FFF motion and if I pull back on the stick it's like a virtual flybar. Going backwards and forwards, doing wide fast circuits. Plus the thing is nice and compact.

I don't see wind as a problem.....I mean I had some time fighting wind gusts earlier today, but that's because I had a 17 gram battery and 10 gram 808 camera attached, but once I ditched the camera, it handled the wind decently.

This video will probably make you sea-sick and the footage itself isn't all that impressive. I don't know why the video\sound is out of synch (EDIT: apparently it's time to reformat my flash card). It was really windy, I'd say 15mph and as you can see I had a time with her, but I like the video quality when there's sufficient light, and I think with a more powerful 300 mAH battery vs the heavy 600 I'm using, it would do better in moderately heavy winds:

2nd Outdoor flight with V939, daytime, very windy (2 min 17 sec)


I get maybe 25% of the instability drops the V929 got and I think that can easily be cured by stronger lipos. I'm experienceing with my V939 what I should have experienced from my Xieda 9958, except it's a better indoor flyer as well in stock configuraton.

It's a good thing too, because I've been missing running my boats as they are under construction, and I can pass the time with my 939.

I may even make a smaller case to carry the 939 in.
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Old Nov 06, 2012, 03:56 PM
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New compact case for maximum fun, maximum portability

TX:



Beetle cradle cut up to provide clearance when placed on top of TX:



Placed on top of Transmitter:



Why so sad? I just made you your own cozy pad (Mowawk is foam pad to prevent road rash)?



Compared to my V911 case:



Thinner:

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Old Nov 06, 2012, 03:57 PM
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My new prop guards. I'll let you know if the adversely affect flight. Sorry for the cell-phone pics:



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Old Nov 06, 2012, 03:57 PM
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Cheap and quick solution to keeping your canopy from falling off. Another benefit is that if you have 600 mAH batteries and slip the rubber band over it as your inserting it, it will prevent the battery from sliding out of position after a crash, or I can even use it to help secure my 808 cam:



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Old Nov 06, 2012, 03:57 PM
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I cut the loops from the zip tie guards. They provide excellent protection as my blades have very minimal road rash compared to before and while the loops provide some added lift in windy conditions, they also reduce agility. Cutting off the loops also saved me .7 grams in weight. We'll see if just having the stalk will provide as much protection, it certainly looks better:



One nice thing with the loops, when crashing in the grass, the beetle would just windmill roll, loops absorbing all impact from high-speed crashes.
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Old Nov 06, 2012, 03:58 PM
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2nd outdoor 808 keycam video. Turnigy 300mAH 35-75C make a big difference in stability. I may need to install a capacitor to smooth out power as the keycam cuts out early where I had at least another minute of video. I mounted the camera on top this time and it's not as stable as underneath, but the battery makes up for it.

I'll probably order the 45-90C battery

V939 with 808 keycam and Turnigy Nanotech 300mah 35-75C battery (1 min 32 sec)
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Old Nov 06, 2012, 03:58 PM
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She wouldn't be able to take off if I had the internal battery installed. To lighten her some more, I completely removed the housing and wrapped her in foam and tape. Shaved about another 2 grams off of her.

Here she is, it's not pretty but works:



8.4 grams



My stock canopy is in pieces so I made another pretty-durable one from a mini fruit cup container. The 808 cam mount was made from a jello pudding single serving container:

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Old Nov 06, 2012, 03:58 PM
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I just received my UDI replacement blades and I like them. The 939 seems more nimble with them. One immediate thing I noticed is that they were much quieter than the stock 939 blades and I believe the reason why is that the UDI blades have rounded tips, whereas the stock blades have squarish tips.

I went wind surfing tonight in 12mph winds. My thumbs went into auto gyro mode, but I was able to confidently wind surf just like I did with my V911, except that I could easily move forward into the wind. The more I fly this thing the less I think I need accelerometers (although I still plan on getting a 6 axis). I'm really likeing the Nanotech\UDI blade combo.

Here's a shot of the tips. Left is stock and right is UDI. As you can see the left is a little beat up, but you can cleary see they are more squarish which creates more noise. Pitch on both seem the same. Also I just realized that earlier where I thought I had a bad blade that was spinning on the shaft, it was actually the wrong direction. I assumed the orange blades were one direction and black were another. Luckly the UDI match the same convention as the V939.

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Old Nov 06, 2012, 03:59 PM
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I'm sick of searching for this post so I decided to add it to blogify it:

Quote:
Originally Posted by Heli Pad View Post
Could you educate me what such a Prop-Motor protection look like or how it functions?


The left is the H36, where the motor mount has a plastic cylinder rising out of the mount to limit the prop from impacting the motor.

The middle is the V202\V939 prop that has a cylinder built into and below the prop center that take up the slack between the prop bottom and motor casing

The last is the Mini Pets motor mount that also has a plastic cylinder rising out of the mount to limit the prop from impacting the motor.

Here you can see the difference between the protected motor on the left and the unprotected one on the right on the Hubsan. This picture also shows my effort to reduce vibration by putting hot glue on each side of the motor where it contacts the Hubsan motor mount:



Make your own prop\motor guards from a Capri Sun straw:







In addition, you want to remove the bottom motor cup and make sure your motor wires are oriented so that they line up with the boom:



The reason for this is that the wire channel will cut into the wires on a crash if they're not properly oriented:

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Old Jun 07, 2014, 02:20 PM
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Does the 939 do manual flips or are they just pre programmed touch of a button flips, or both?
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