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Should I use a different frame?
#1
Hello All,

I went for my first flight today with my newly built MHQ2 DIY 250 FPV drone. I am extremely happy with the build HOWEVER I had two problems arise. The first is that I had my battery alarm set to go off at 3.5V to give me a little time to land once it went off without worrying. It went off and within 15 seconds it fell out of the sky... 

So the first question is: Is 3.5V alarm to late of a warning? Why did it shut off rather than keep flying?

Secondly, on crashing it broke both landing gear legs and cracked the top frame. I knew 3d printed parts would not be as strong but it is also very heavy and I feel that I should probably get a different frame. Is there anywhere to get a H frame similar in design to the MHQ2 (http://www.hovership.com/2014/10/27/mhq2...available/) with folding arms that is carbon fiber? I dont need a full kit with PDB or anything and trying to not spend a TON of money. 

Any recomendations?

Thank you
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#2
Hey guy, 

I´ll comment on the battery issue only: In theory the alarm at 3.5v should be ok, however I´ve seen issues like this happening (to me) and my alarm is to 3.6v now, and if I land earlier and see batteries at about 3.7 I also stop.
There are situations were one cell gets more drain than others, and for some reason quicker than others.
I saw situations where I had 2 cells at 3.3 and a third one at 3.0 or even below like 2.9v, if something like this happens, your quad falls like a brick, that´s it.

It happened to me few times, and then I changed the setting for 3.6v instead and never had this issue again. Remember to keep some juice for security purpose, fly is fun, but you don´t need to fly until you drain the battery completely. 

Something else I do is:I use 1500mah batteries, that gives me 7 to 8 minutes of non aggressive flight. My transmitter (AT9) has a timer configured for 7 minutes. It also gives me an indication that is time to land regardless the alarm.

Hope it helps
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#3
(14-May-2017, 07:54 PM)flabombarda Wrote: Hey guy, 

I´ll comment on the battery issue only: In theory the alarm at 3.5v should be ok, however I´ve seen issues like this happening (to me) and my alarm is to 3.6v now, and if I land earlier and see batteries at about 3.7 I also stop.
There are situations were one cell gets more drain than others, and for some reason quicker than others.
I saw situations where I had 2 cells at 3.3 and a third one at 3.0 or even below like 2.9v, if something like this happens, your quad falls like a brick, that´s it.

It happened to me few times, and then I changed the setting for 3.6v instead and never had this issue again. Remember to keep some juice for security purpose, fly is fun, but you don´t need to fly until you drain the battery completely. 

Something else I do is:I use 1500mah batteries, that gives me 7 to 8 minutes of non aggressive flight. My transmitter (AT9) has a timer configured for 7 minutes. It also gives me an indication that is time to land regardless the alarm.

Hope it helps

Thank you for the reply! I have changed my alarm to 3.6 (i was wrong it was at 3.4 before) I dont believe the FlySky TX i have had the timer but I will look into that or something else as I think that would help a lot as well with not getting to far away or to high right before the battery gets low. Glad to know I'm not the only one thats happened with.
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#4
sounds like the c rating on the battery is too low
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#5
Hobbyking sell a Glass-fiber folding arm ~220mm frame and I think I've seen a carbon version on AliExpress.

Is there a particular reason folding frame is attractive to you in that wheelbase?
Builds: Mini-Quad  -  Tricopter 
A Blog

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#6
(21-May-2017, 12:46 AM)Aaron Wrote: Hobbyking sell a Glass-fiber folding arm ~220mm frame and I think I've seen a carbon version on AliExpress.

Is there a particular reason folding frame is attractive to you in that wheelbase?

The main reason is compactness when hiking/traveling. I have used 2 different frames (one folding one not) and the folding one fits way better in my backpack
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