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Author Topic: Mini Drak - with MFD AP  (Read 1350 times)


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Mini Drak - with MFD AP
« on: August 30, 2017, 08:47:14 PM »

hi guys this is more of a question than anything.
I'm building a Mini Drak. my problems are these:

First time I've used an MFD in a wing: I've loaded the x5 preset.
Aileron input has to be reversed in the MFD plane set up to get Aileron to go the right way when the AP is in stability mode. However, this now means that the left and right in the menu is also reversed.
Is it me or have MFD screwed up somewhere? (It's as if the firmware is 180 degrees out from the expected RC input).
Do MFD's normally have aileron reversed to make a wing work?

Second problem (bit more worrying): The MFD has a built in compass and the Mini Drak doesn't have a lot of room near the C of G and the tail end. With the runcam in the nose I have to have the battery pushed back as far as it goes to get it to balance. :-( My concern is that the battery, current sensor and ESC are all crowded around the MFD. To my mind this is going to be an expensive crash!
I'd welcome any Comments/advice/warnings??


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Re: Mini Drak - with MFD AP
« Reply #1 on: August 30, 2017, 10:56:46 PM »

Putting the esc outside the hatch- just in front of the motor would improve cooling and shift the cg back- allowing you to move the battery a little further forwards.

Or just don't crash :p


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Re: Mini Drak - with MFD AP
« Reply #2 on: August 31, 2017, 12:18:48 AM »

Now there's an idea..
Yep I can see that would work.
I'm a bit reluctant to start chopping up the top cover at this stage 'cos I can't get anther one if it goes wrong... Unless some else has done it first!


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Re: Mini Drak - with MFD AP
« Reply #3 on: August 31, 2017, 10:41:40 AM »

Are you sure you need the battery that far back to balance it? I had the same motor on mine which was mounted closer in, a Runcam 2 and a Runcam swift in the nose and that same battery could go much closer to the nose and still hit CoG?

You could probably move the ESC back without having to mount it externally depending on how big the heatsink is.

Whats in the side bays? could you put the gps in there? Or just cut a small cutout for it next to the main bay? Thats what I ended up doing.


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Re: Mini Drak - with MFD AP
« Reply #4 on: August 31, 2017, 06:50:55 PM »

Hi Iwan,
Thanks for the reply. it sounds like I'm panicking a bit then.

It's going to have it's maiden at the weekend but I've no idea how much reflex it needs on the elevons or how much travel. (I have heard that it needs surprising little travel - although that could be a myth).

How much reflex does it need?
How much deflection on the elevons seems reasonable?
Finally where is the C of G on yours? (I was told to go for 20mm forward of the spar initially).


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Re: Mini Drak - with MFD AP
« Reply #5 on: August 31, 2017, 11:51:05 PM »

The menus being reversed is because you are holding the roll stick the wrong direction while entering the menu, use the opposite direction ( both bring up "Enter Menu" and you will find the directions to navigate are working the right way.
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Mini Drak with MFD AP
« Reply #6 on: July 14, 2018, 10:15:51 AM »

Looks like a nice build   How well do the v6 brakes hold up with all the extra performance on tap??

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