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 phoenix 

 15 November 2018  

 What can I say , the price was just to low to pass . I ordered on a Sunday and it arrived on the Tuesday after . My first impressions were - what a brick . Kind of used to smaller lighter models so the Phoenix took me by surprise . Just one wing half weighs 164 grams and both wing halves joined with the spar come in at some 354.6 grams . The fuse with rudder and elevator put in place comes in at 543.3 grams , making the incomplete total something like 897.9 grams . There is still more work to do so the weight will go up . ( Flying weight ? - maybe north of a kilo ? )

 After checking out a few user reports / reviews it looks like there is a serious motor issue . To put it simply people are killing the included motor , so what was I to do but try and explore the reason why such would happen . To this end I charged up a 2s 2200 battery and a 3s 2200 battery . Goal was to see how much current was being drawn , the sort of RPM the motor / prop was doing at said current and at what point the motor started to cook .  Taking it all outside I had my power meter / charged batteries / transmitter / tacho / and Phoenix 1600 of course . The prop is supposedly 10x6 , measuring the DIA of mine the result was 10.25 inch DIA .

 

Motor Spec's - 2212 / 1400kv

2s ( let's call it 7.5v under load ) = 10500 RPM

3s ( Let's call it 11v under load ) = 15400 RPM

 

Fully charged 2s 2200 mAh capacity .

5190 RPM @ 10Amp current draw 
6000 RPM @ 16Amp current draw 
6320 RPM @ 20Amp current draw 
( Highest current seen on 2s was 21.5A ) 

The motor cooks really well @ 20A current draw ... 

Fully charged 3s 2200mAh capacity

5760 RPM @ 10Amp current draw 
6500 RPM @ 15Amp current draw ( close to 50% throttle ) 
Motor is cooking really well @ 15A 3s 
( Highest current seen with a 3s was 28.5A and the motor got finger burning hot after only about 15 seconds ) 

 Now looking at the results the only conclusion I can draw is that the motor is over propped . Also with the included propeller it looks like the motor begins to cook with about 150 watts going into the motor . I wont say this is a 150 watt motor because it is over propped , but it is certainly the point at which the motor begins to cook . Something else to consider is the diminishing returns from feeding in more power , that extra power is more likely being turned into heat rather than thrust .

 2s Results - 5190 RPM @ 10 Amp / 6320 RPM @ 20 Amp , double the current for only 1130 RPM more . Depending on voltage sag under load we are comparing about 80 watt to about 150 watt ( In that neighborhood )  for that extra 1130 RPM .

 3s Results - 5760 RPM @ 10 Amp / 6500 RPM @ 15 Amp , 50% more current for another 740 RPM . Depending on voltage under load we may be talking about 110 watt  VS 165 watt for a extra 740 RPM .

 Feeding this motor any more power simply makes the motor hotter . And giving the motor full throttle with the 3s battery resulted in some 28.5A measured , or something in the neighborhood of 300 watt . No wonder the motor got finger burning hot in around 15 seconds of full throttle use on a 3s . On the 2s at full throttle I saw 21.5 amp for around 220 watt ( and maybe a little more ) , but the motor was getting seriously hot .

 What to do ? , the solution is possibly 3 fold . Buy a new prop ( smaller ) , buy a new motor ( larger ) , or change the throttle curve in your transmitter to avoid over powering the motor and cooking it .  It looks like maybe 200 watt may fly this model reasonably well so I have ordered a 270 watt 1000kv motor . It's going to take (?) a week or two for the motor to get here giving me plenty of time to finish the Phoenix 1600 .

 

Part 2 ...

 I really have to commend the kit maker for going cheap , not saying the hardware wont cut it ! But certainly the lowest quality that will get the job done . And if you read the product description , there might be a claim that the Phoenix - "  Is a super strong glider that takes 15 minutes to put together " -  Really ?  Now that is a very bold statement . If I had to guess , I would say that you could do it in a evening / afternoon / or morning if you knew what you were doing . For Noobs I would say give it a few days and don't rush it .

 Control horns are fiddly and take time , I had one that easily took 15 minutes or more on it's own .  With the control horns in place you then want to center your servos and align your control surfaces . I decided I really wanted to utilize the flaps after watching a few YouTube landings and since the servos are included , why not . There is a little bit of foam in the corner of the flap that needs to be cut out to make the flaps functional , don't forget to cut it out ! Also there is a Y servo lead included in the kit for the Ailerons and Flaps , I only utilized the Y lead for the flaps on Ch6 and I just did a Tx mix for my Ailerons . This way if I want flaperon , I can always mix it in .  Overall assembling the Phoenix is some what easy , but certainly some what time consuming when you consider the 15 minute assembly claim .

 With my Tx set up and all my control surfaces as good as I can get them I decided to remove the motor . To accomplish this the battery tray needs to come out so that you can get to the ESC / motor connectors . It looked easy until I met resistance , seems some over zealous individual applied glue to the assembly . To remove the tray a few things broke . The servo tray got some what broken and I tore out one frame rail that the tray sits on .  

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 Everything is pretty much done now , I just wait for the new motor that will hopefully provide the Phoenix with some power without frying itself .   Part 3 will be the flying part ( I hope ) .   

 

Update = New Motor - 1000KV 270W Brushless Motor N2830/11

  2s - 12.5A full throttle - 6180 RPM

  3s - 18.4A full throttle - 7600 RPM   ( Just made room temp )

  New motor went in easy , no issues . Runs crazy cool compared to the old factory supplied motor . Maybe I should have got a 1200KV or 1400KV motor to get higher RPM . But this motor runs crazy smooth to boot , guess I could always try 4s if more power is needed .

 

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 Hobbyking had some folding carbon blades on sale and I thought I would take a punt on the blades fitting the Phoenix . Fit they did , but the blades were horrendously out of ballance .  Anyhow , lets check out some performance figures .

 2s - 12.6A - 6000 RPM 

 3s - 20A - 7800 RPM

 On the 2s we gained a little I think , but the gains were really seen on 3s . More current . more RPM , with a larger DIA propeller = More thrust .  Best of all the motor is still running cool , which makes me wonder just how much blade the motor will take ? ( 12x6 - 13x6 ? )