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Heavy Lifters
Howdy Boys,

Just fitted the 13 x 4.7 SF props and decided I could not wait until morning so I did a test hop under the floodlamp in the back yard.

Weight 5.6kg, 11.1V and 13 x 4.7 SF props. (Matched set)

Lifted off cleanly at approx 60% throttle and hovered easily at 4 - 5 inches from the ground.

The prop wash is much less violent with the 4.7" props and that allowed me to hover 5" from the ground and do a left 90 degree rotation followed by a 180 degree right rotation with a high level of stabilisation.

Judging by this short test hop I am exactly at the point I wanted to be. Projected all up weight of the completed project est 5.6kg.

Estimated total thrust of the quad section 7.5kg which I believe is sufficient to handle the way I intend to fly the completed aircraft.


Only time will tell of course but the real test will be down on the farm next week.

It is surprising how quickly things have started to come together. Wink 

KK
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  • Tom BD Bad, unseen, sloscotty
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(24-May-2017, 08:47 PM)fftunes Wrote: That's good to hear! Another proof that Boris B. can be very wrong sometimes... (ignore that comment, see it as an insider joke lol, but to quickly explain, at one point i had an argument with him where he insisted that stick commands are the same, no matter which transmitter mode you use).


Hovering at 70% doesn't sound so bad at all, so maybe it was high PID or noise messing with power output. Question, the HK V3 doesn't use betaflight, does it? Just as a heads-up, i wouldn't want to learn yet another firmware... Wink Not saying it couldn't work better out-of-the-box, so probably still worth a try.

Hi FF, I think you are correct. There is certainly a big difference in thrust.

I noticed tonight that the sound with the 13 x 4.7 is not as sweet as the 12 x 6SF. It tends to be a little harsher. I did spend some time balancing the props so I probably need to investigate that a little further.

Now my big problem is can I reprogram that V3 to "X" config. The programmer arrived today as well.
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Howdy Boys,

While things are quite waiting for me to do the test flying down on the farm I thought a little story might help brighten things up.

Back in the early 1970's Silvertone devised a system for training Shoulder launch missile operators (Red Eye) in the Australian Defence Force.

As you may or may not know the missile is spring launched to stop the operator copping a face full of rocket exhaust but this means that after the target has been acquired by the missile, the operator must super elevate the launch tube before pulling the trigger.

All of this takes considerable practice and we suggested an RPV fitted with an infra-red heat source would be ideal for this sort of training,

In due course this idea was picked up and I found myself flying a Silvertone Weightlifter RPV on military airfields. (again).

This sort of flying at the time was quite arduous as it meant flying out to 1100 meters from launch on a race track flight path for 40 minutes at a time. Land, refuel and another 40 minutes of quite monotonous but very accurate flying. This went on all day with only a break for lunch.

Looking back what a project for an autopilot and FPV! I could have sat back, Mint Julip in hand and cruised that course no sweat.

How times have changed.

The photo shows the Silvertone Airforce c 1974. Weightlifters lined up for delivery.

Sigh.....How I miss those days.

KK
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Howdy Boys,

Just got home after a frustrating two days down on the farm.

No real luck with the new HK FC. Plenty of power, no stability. Very difficult to fly.

So when I got home I decided to read the instructions and found a reference to reversing the gyros.

Then it hit me. The yaw gyro was acting in reverse.

Reversed the gyro, rotated the FC 45 degrees CCW and bingo!

Good stability, plenty of power and no problem flying in the "X" configuration.

All of this in a morning in my little backyard.

Now I cannot wait to get down to the farm again for a real test.

KK
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  • Tom BD Bad, unseen, sloscotty, fftunes
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Good to hear Thumbs Up

Just wondering, could you reconfigure it as "x", or is it still in "+" configuration, just with 45° offset, and just somehow magically working? Smile
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(31-May-2017, 03:57 AM)fftunes Wrote: Good to hear Thumbs Up

Just wondering, could you reconfigure it as "x", or is it still in "+" configuration, just with 45° offset, and just somehow magically working? Smile

FF, I tried all sorts of things from contacting HobbyKing tech support to searching the web and asking on this and other forums.

No result whatsoever.

So when all else fails, innovate.

I used to do something like this with fixed wing aircraft in the very early days.

As you say, somehow it magically works.

In actual fact i have found quad controllers to be amazingly flexible, tolerating all sorts of my misbehaviours from mixed props to operating in oddball modes.

I will say however if I could get what I want I would not need to resort to naughty stuff Big Grin

As I have said on previous occassions, I certainly have learned a lot about quads, even how to misbehave.

KK
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  • fftunes
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FF, just to bring you up to date the status of Wooden It at the moment is as follows;

AUW = 5.6kg
Props = 4 off 13 x 4.7 SF
Flight Controller = HK V3 "+" configuration mounted in the "X" position.
Test flying in backyard = steady hover at 30 cm no problem.
Throttle approx 75% at 11.1V

The next test at the farm will be dedicated to climb to altitude and descent from altitude.

That is after I learn to fly the poor old girl.

Regards,
KK
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  • fftunes
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Haha that's cool. Big Grin I guess i wouldn't recommend this for a quick light acro quad that moves at the limits of what's physically possible, but as long as your heavy lifter does what you want it to do that's perfectly ok imho. Thumbs Up
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(31-May-2017, 06:55 AM)fftunes Wrote: Haha that's cool. Big Grin I guess i wouldn't recommend this for a quick light acro quad that moves at the limits of what's physically possible, but as long as your heavy lifter does what you want it to do that's perfectly ok imho. Thumbs Up

FF, nor would I. Wooden It is intended to fly vertically to 30 meters and descend vertically from 30 meters. That is all I will ever ask of it. As long as it can do safely I am happy.

Tearing around the sky doing the physically impossible is for another style of beast.

Very sedate, that is my Wooden It. Rolleyes
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(31-May-2017, 06:52 AM)Keyboard Kid Wrote: AUW = 5.6kg
Props = 4 off 13 x 4.7 SF
Flight Controller = HK V3 "+" configuration mounted in the "X" position.
Test flying in backyard = steady hover at 30 cm no problem.
Throttle approx 75% at 11.1V

75% throttle at hover? that's pretty under power IMO for a quadcopter.
Normally for quads this size 6S LiPo are used to increase efficiency and power. Can your hardware perhaps support higher voltage batteries?
Don't be a LOS'er, be an FPV'er :)  My Gear - Facebook - Instagram - Twitter
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(01-Jun-2017, 11:32 AM)Oscar Wrote: 75% throttle at hover? that's pretty under power IMO for a quadcopter.
Normally for quads this size 6S LiPo are used to increase efficiency and power. Can your hardware perhaps support higher voltage batteries?

Hi Oscar, thanks for the input.

It is difficult to explain what I am doing in a few postings but briefly I am trying to find the lowest possible battery size that will do as I require.

i.e. Take-off, climb to 30 meters, transition to level flight, transition back to vertical at 30 meters, land.

That is it. No forward flight, no flips, no physically impossible tricks, just very sedate vertical flight.

To close, I am holding a move to 14.8V in reserve if my 11.1V project comes off the rails. Howver that is a last ditch move.

KK
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(02-Jun-2017, 02:07 AM)Keyboard Kid Wrote: Hi Oscar, thanks for the input.

It is difficult to explain what I am doing in a few postings but briefly I am trying to find the lowest possible battery size that will do as I require.

i.e. Take-off, climb to 30 meters, transition to level flight, transition back to vertical at 30 meters, land.

That is it. No forward flight, no flips, no physically impossible tricks, just very sedate vertical flight.

To close, I am holding a move to 14.8V in reserve if my 11.1V project comes off the rails. Howver that is a last ditch move.

KK

ah okay if all you need is an "elevator" then it really doesn't matter LOL Big Grin
Don't be a LOS'er, be an FPV'er :)  My Gear - Facebook - Instagram - Twitter
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Howdy Boys,


I am promoting myself today for I have now reached that first pinnacle of quad knowledge.

I no longer know absolutely nothing about quads.

I now know a whole lot of stuff about quads that does not work. Cry 

Who knows, I may even finally one day get to that next pinnacle of knowledge. A little about things that do work.

It appears that the V3 cannot cope with the rectangular layout of Wooden It being a "+" config controller.

So I have ordered a DJI Naze M Lite FC which is configurable to "X" so we will see.

So to recap, I have one controller that does not deliver the power I need and another that delivers plenty of power but no stability.

Will I be lucky next time?

I am starting to wear out. Who is for another "What I would have given for FPV" story?

KK
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lmao... I have to admit... I can't even imagine much of the technical issues you're working through.... These guys have much better advice than I could even start with... even if I cringe a little at the word "Naze"... but it's fun to keep reading the trials and tribulations of your experience!

Keep on, stay strong, and well... knowing your history at that point... I can't really say "keep going 'til; you succeed" because I think you're probably a bit beyond a pro at that... you're kinda one of the inventors of that :p I am rooting for you!   Popcorn
carl.vegas
Current Quads: Operational: Diatone GT2 200 In need of repair: Bumble Bee, tehStein,  Slightly modified Vortex 250 
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Popcorn this is probably the most accurate emoticon for this thread. Awesome read! Looking forward to see what will come of it!
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