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Old 10-30-2016, 02:31 PM   #21 (permalink)
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Today I finished my modified k120 and... I flies!!! Would like to post some pics if someone is interested but... How can I upload pics in a thread?
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Old 10-30-2016, 02:51 PM   #22 (permalink)
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Quote:
Originally Posted by Max olivier View Post
Today I finished my modified k120 and... I flies!!! Would like to post some pics if someone is interested but... How can I upload pics in a thread?
Click on the paperclip in advanced post mode. Then upload your picture. If you want a big one of it click on it after you upload it and right click copy image address. Then click on Insert image and paste that address. You will end up with an attachment and a large picture in your post.
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Old 10-31-2016, 02:59 AM   #23 (permalink)
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Thanks for explaining but cannot activate advanced post. I have no right to edit my posts as explained in the FAQ section...
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Old 10-31-2016, 04:55 PM   #24 (permalink)
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Default k120 frame+servo+main gear modification

Here is my modified k120. Goal is to improve crash resistance, increase agility and reduce weight.
I used some CFRP plates glued to parts of the ABS original frame.
This gives more space for Arrow D03018MG. Thei are fast and metal gear so... no easy stripping and the weight is not much more than original XK servos.
I also glued together with epoxy two main gears so now there should be no more risk of teeths stripping also.
Battery is now on top, so COG is more near to rotor and hopefully heli will be more responsive and with less cross coupling on maneuvres... maybe...
Receiver and ESC are suspended on two ear plugs fitted in a hole in the CFP frame. No more screws to fix the PCB so vibrations should be damped more.
Weight is still similar to the original overall.
After some test flight tests on the next days I will move to next steps:
-lightweighting of the CFRP parts that are now kept "solid"
-think of a way to make the skids lighter and shorter
-Manufacture a new canopy since the original one do not fit any more of course...
-Reduce the tail weight by simplified tail motor mount and maybe reduce the tail boom size... the 5mm CFRP rod seems oversized for this heli...
-Try a CFRP rotor mast in place of the steel one... I bent already 3 of them...

Still open point whre advise is wellcome are:
1-what to do with the feathering shaft... it benbds too easily.
2-Is there any more powerful motor to replace the stock without changing ESC?
3-Any advise on rotor blades replacement? I still have 5 pair of originals but would like to know if more performing blades are available.
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Old 11-30-2016, 10:03 PM   #25 (permalink)
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Quote:
Originally Posted by Max olivier View Post
Here is my modified k120. Goal is to improve crash resistance, increase agility and reduce weight.
I used some CFRP plates glued to parts of the ABS original frame.
This gives more space for Arrow D03018MG. Thei are fast and metal gear so... no easy stripping and the weight is not much more than original XK servos.
I also glued together with epoxy two main gears so now there should be no more risk of teeths stripping also.
Battery is now on top, so COG is more near to rotor and hopefully heli will be more responsive and with less cross coupling on maneuvres... maybe...
Receiver and ESC are suspended on two ear plugs fitted in a hole in the CFP frame. No more screws to fix the PCB so vibrations should be damped more.
Weight is still similar to the original overall.
After some test flight tests on the next days I will move to next steps:
-lightweighting of the CFRP parts that are now kept "solid"
-think of a way to make the skids lighter and shorter
-Manufacture a new canopy since the original one do not fit any more of course...
-Reduce the tail weight by simplified tail motor mount and maybe reduce the tail boom size... the 5mm CFRP rod seems oversized for this heli...
-Try a CFRP rotor mast in place of the steel one... I bent already 3 of them...

Still open point whre advise is wellcome are:
1-what to do with the feathering shaft... it benbds too easily.
2-Is there any more powerful motor to replace the stock without changing ESC?
3-Any advise on rotor blades replacement? I still have 5 pair of originals but would like to know if more performing blades are available.
This is awesome. How's she fly?

Love to find better feathering shafts. Wonder if an entire head assembly from another copter will work out better?
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Old 12-01-2016, 11:51 AM   #26 (permalink)
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Flies good! I have still to try some 3d but in 6g it is very stable. Even with 100% throttle Stands still in the room with hands off the radio for more than 20 seconds before starting a very slow drift. I am thinking of trying the k110 head. Maybe the plastic is more flexible than aluminium and saves the feathering shaft and weight. I am looking around for options but I cannot find info on compatible heads with stronger feathering shafts... first I will try more flights... and crashes... In the end one feathering shaft cost 1 euro...
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