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Bang for buck mods on the EMAX hawk 5

14/8/2018

9 Comments

 
Update! I've just finished writing an extremely detailed walkthrough about how to upgrade the VTX - full blog here
Picture
The Hawk 5 ready to fly 5" quadcopter has been out for several months now and has been a real hit for Emax - so much so that it is only widely available from a stock perspective now. I have one which I've reviewed (here) and can quite easily say it is the most well-balanced and complete bind and fly quadcopter I've come across. Gearbest and Banggood currently have this is on special for $209 and $229 respectively (check out my discount page here)

My real life work means I'm always looking to improve on systems and it's no different for my quad obsession. So I've made a list of my favourite 'improvements' or probably more accurately personalisations as these are more about changing the feel of the quad to suit my taste rather than the basic operation. I'll also cover off the things I haven't touched because I've not yet thought of a better alternative.

PictureEmax Hawk 5, 6 inch arms
6 inch arms
The 6 inch arms are available as a direct uprgrade from Emax rather than a third party offering. All four can be had for less than $20 so it's fair to say Emax is looking to expand their ecosystem rather than profit of these in particular. They are very easy to fit since the frame uses captive nuts and arm retention hardware is independent to the stack mounting hardware. This means you can change the arms without pulling anything apart. Arms are sold in pairs and are presently in stock at Banggood for $8.99 per pair.

PictureYou can see the 5 inch arm overlaid on the new 6 inch ones
The new arms will push the motors out by 15mm in each direction and the good news is EMax allowed for enough slack in the motor wires so they they don't need to be extended - making the whole process VERY simple. To start I flew with 5" props on the new 6" arms and was suprised to find how much more stable it was in regular flight. I've found examples where several pilots prefer 5" props on a 6" quad for a more stable HD platform (e.g. Gapit) or for improvements to a racing rig (Serge from Piroflip noted that his son Dolma FPV runs a 6" frame with 5" props. KababFPV who works with Piroflip has suggested this is likely due to the lesser amound of turbelent air to each prop given the additional spacing. One potential down size is the additional width but in reality this is only an extra 9mm wide on either side. Theory aside I really liked the feel of stability.

The next obvious advantage this gives is the ability to physically use a 6" prop. In most circumstances you'd need to revisit your motor choice (stator size and/or kV) but in this circumstance the seemingly low kV that Emax chose (2300kV) and and reasonable stator size (2206) means that it can swing a 6" prop on 4s with no issue. I chose to use the Gemfan 6042 bi-blade but have heard good things about the 6" LR Avan prop too. Since the quad is light and the 6" adds so much prop area, they have more than enough grip - much more than a 5" tri blade... feels like they stop on a dime. There are a number of good 3 blade 6" props available now from Dalprop and HQ but I feel the extra weight these add is unnecessary because it will take away from the response of the 'just big enough' 2206 motor. In the air hover is achieved on a much lower throttle as is everything else. Most flying is done at low to mid and the sense of control is strong. Full throttle draws a LOT of current: 135A on 6042 vs about 90A on the HQ 5x4.8x3. High throttle is less about more thrust and more about current draw suggesting the motor has probably hit its limit. This would be a great candidate for scaled throttle reduction in betaflight 3.4.0 onwards as per my setup guide. That being said the thrust is immense for such a light quad and actual battery life was somewhat similar to 5" props but so much more variable - it will be way more efficient than 5" at light throttle but way more inefficient at heavy throttle. For the cost of the arms and props and ease of install I'd definitely recommend giving it a try. The video below shows my first flight on 6" props, please turn the sound down. punch outs at 0:23 and 0:40.

PictureHQ 5 x 4.8 x 3 V1s propellers
Changing the props
I love the idea that Emax created the 5" Avan Flow around the Emax LS2206 motor on the Hawk 5 but I just don't like the feel. Don't get me wrong, I love the idea that the weight is kept close to the hub and that it is durable and well balanced but just don't like the way it delivers power. To me the HQ props feel much more familiar and I've found the 5x4.8x3 V1s with it's relatively steep pitch is a good match for the LS2206 2300kV stock on the Hawk 5. The other thing I prefer over the V1s design is efficieny. Top speed 'feels' similar but maximum current draw is only 90A on the HQ 5x4.8x3 but 110A on the Avan Flow using my best batteries. Plenty more props for me to try including the HQ 5.1x5x3 but at this stage I'm really pleased with the 5x4.8x3

PictureImage from Thingiverse - click to follow
Antenna mounting
I find the video transimission surprisingly good on the Hawk 5 but the antenna solution is a let down. Dipoles are fine for flying alone but the Hawk 5 one is not secure. I did the cable tie/heatshrink trick to secure but still lost it after and upside down landing anyway. I wasn't bothered though, because my race club doesn't allow dipoles as a vtx antenna because of the increased likelihood of bleed over to other channels. Emax were good enough to include a UFL to SMA cable and 2 x excellent Emax Pagoda LHCP antenna but recommend a rubbish way of mounting them with cable ties that is just not secure and risks the antenna getting caught in spinning props. The best solution in my opinion is a 3d printed one. I don't own a 3d printer but a service like 3d hubs means I can download an appropriate file from Thingiverse and have it printed and delivered to me - it was only about $5 for 2 printed mounts. Here is the design I recommend since it elegantly incporated and SMA VTX antenna mount and receiver antenna mount using forever tubes. I had a 3d printed mount from an old floss 2 frame and found the standoff spacing is identical (31mm) so have just used this for now. Here is the link for that design. It's a tidy solution that keeps the antenna safely away from the props and allows a good and for a racing quad that is commonly tilted forward fairly heavily.

Picture
How the mount attaches
Picture
End rusult of how the antenna is angled - well out of the props
PictureI used the HobbyCool 2207 1700kV on my 6s race build
What I haven't changed:
Motors. Many (including myself) questioned the choice of 2206 2300kV motors when Emax had the 2207 mid-high kV variants available. I no longer question the stator size or kV as I think both are an excellent match for this quad - the 2206 is plenty for a lightweight build and the 2300kV offers great efficiency and flexibilty as per 6" props whilst still being suprisingly powerful. The only change I would make is going to lower kV IF I decided to run 6s which this stack is apparently capable of - Conrad Miller (Furadi) is an EMax team pilot and has run 6s on a magnum stack with a 1700kV motor. If I did go for a low kV motor the standout option for price/performance in my opinion is a Brother Hobby Returner R3 2207 1700kV which is only $15 under the HobbyCool Logo. I've used these on my 6s race build (blog here) and they are super nice.

PictureTHe HGLRC AIO VTX DVR is an excellent VTX than incorporates a DVR in a single layer 30.5mm board
VTX. The included VTX is limited to 200mW and has no smart audio. Many users have reported poor performance or reliability problems although I have found signal and reliability to be just fine. If it were to die I'd probably install the AKK infinity VTX DVR combo or HGLRC AIO VTX DVR (reviewed here). The stock Hawk 5 is too light to carry an HD cam so an onboard DVR would be a satifactory backup. Given the current VTX shares a stack layer with the XM+ receiver this would need rewiring and I can't bring myself to do this on a receiver that is currently working well for me.

PictureThe Runcam Micro Eagle is the only camera I'd choose about the Foxeer Micro Arrow Pro
Camera. The Foxeer Micro Arrow Pro as on the Hawk 5 is hands down my favourite budget camera. It gives consistent performance regardless of sunny or overcast day unlike many of the new CMOS cameras. An exception to this is the Micro Eagle which is the best camera (IMO) period. It's not cheap though so I can't justify replacing the Arrow pro but this is the only camera I'd uprade to.

Conclusion
All of the mods I've included here change the feel of the quad except for the VTX antenna mount which is a MUST HAVE in my opinion. I do like the longer arms with the HQ props and this is what I've settled on but this is a feel thing more than anything else and was not expensive so, why not?! I'll only replace the cam and VTX if mine break down. If I break motors I'll replace like for like unless I change the whole fleet to 6s which is presently unlikely.

Please feel free to browse the rest of my site, I now have almost 100 reviews and tips/tricks blogs as well as a regularly updated specials and discounts page.
9 Comments
Morne Kotze
18/8/2018 01:32:49 am

Hey mate,
Great write up on the Hawk! I got one a couple of weeks ago and love it. Regarding the 6" arms...have you tried running 6" in the front and 5" in the back? Or visa versa? What effect do you think that would have?

Cheers!

Reply
QuadifyRC
20/8/2018 11:52:42 am

Glad you like it, it's a great quad and there is a growing community around it meaning there will be a growing body of information.

Thats and interesting question. Ultimately the change in geometry may change the balance - pitch may become more responsive in one direction or yaw may get confused. In reality the FC will try to correct and my guess would be hot motors as a result? Probably not something I'll try unless I can hypothesise an improvement but a good thought provoker.

Reply
Robert Brush
20/8/2018 10:29:05 am

I have to say you have shot me into the world of 3-D printing. Thank you for sharing the design from Emax and the the resource to get it done!

Reply
Quadify
20/8/2018 11:55:28 am

Yeah I love that 3 printing in the world of quads means you can generate useful parts rather than just prototyping and novelties. 3d printing is a Hobby itself with a learning curve and expenses which is why I go with 3d hubs. There is a printer near me run by an ex-quad guy that knows his stuff and uses good material but more importanly has the expertise. I don't fly enough as it is so would rather use my time for that.

Reply
QT
14/9/2018 12:53:03 am

Greetings,
Great guide. I was wondering do you perhaps have a pretuned Betaflight 3.4 image I could flash or at least the dump output for a tuned stock Hawk 5 on Betaflight? See I have the stock 3.2.2 Betaflight installed but I want to install a GPS with failsafes which I need 3.4 for. When I searched about 3.4 I kept finding guides that stated I would have to tune the Hawk 5 from scratch since 3.4 does not just simply work by copying configuration data from 3.2.2. Is this correct?
Thanks

Reply
QuadifyRC
17/9/2018 05:13:15 pm

Thanks! Short answer is not right now but will look at updating to 3.5 soon. I'm only hesitating because I doubt I'll better the 3.2.2 protune but the newer filters should get it close.

What I'd recommend is firstly do not copy settings from 3.2.2 - they are very different. All I'd do next is follow all the recommendations in this guide below. Stock tune is really good with all the other improvements they've made and you also have access tot he new features like RTH mode etc. https://github.com/betaflight/betaflight/wiki/3.5-tuning-notes

Reply
QT
21/9/2018 12:00:47 am

Yes the 3.2.2 tune is certainly good. I actually posed this question directly to EMAX too and you both replied in the last day or so. EMAX actually gave me the 3.4 cli tune from their engineers and said just copy it over we have tuned it for you. My GPS arrived today too so it looks like today is going to be a day of flashing and testing lol. I have read that 3.5 has some weird glitches with the Hawk 5 so it might be best to hold out. 3.4 still has RTH and such so it should be ok. :)

emilliano zapatta
16/10/2018 09:13:44 am

Hawk 5 is BRILLIANT ! Just picked up #3 to put away for backups. I fly it only with 6" and 6" biblades
Gemfan 6042 Ferrari Red with the bird canopy.
I don't understand the hype over 6S when a kwad like this with "ok" motors ad 4S gives long flights great range excellent POP and DROP ! isn't that what we all want ? next step 7" !

Reply
QuadifyRC
17/10/2018 08:54:32 am

Hi Emilliano

Wow number 3 haha. I like the 6" arms but found the bibaldes didn't suit my flying style. They sound awesome though!

I've build a couple of 6s quads now but I'd tend to agree. 4s will suit 90% of people. The only advantage I see to 6s is getting more consistent power from the battery when you are flogging it hard during a race - something I'm not yet good enough to do. If you ever get the itch I hear the Hawk 5 will run 6s with lower kV motors...

Reply



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