More logo 400 questions

[Stanley Speel]

Ok so ive finally finished repairing my logo 400, and after a bit more looking online I have a few more questions.

I read on a couple of threads on HF that im not alone with my unexplained tipover, and that it has happened on all sorts of fbl controllers, resulting in a hard right or left aileron. If I remember correctly (on a phone atm), this was due to vibrations. I really do not want to end up having another expensive and pointless crash due to this. I managed to recreate this 'tipping'- sometimes even causing the HC3SX to shut off! Also this tipping was sometimes caused by increasimg the gain.

Logo 400 HC3SX vid 1.mp4 - YouTube
Logo 400 HC3SX vid 2.mp4 - YouTube

I managed to temporarily (or hopefully permanantly) fix this by remounting the HC3SX with a new foam pad, and a couple of mm forward. So, my first question - is there any better place to mount it?

I also know that the HC3SX is very good at coping with high vibrations, so for it to give a vibration warning means they must be pretty bad (this warning isnt even shown in the manual its so rare!).

A bit more looking around points towards the vibrations being due to the gear mesh? Firstly, what does this mean exactly? I have tried my best to have the boom at 90 degrees to the main gear, and have used a bit of paper to adjust the backlash of the pinion and motor as suggested in the manual. Is there anything else I should look out for or do?

Finally, a bit of a random question but what is the largest blade size a non-se logo 400 can take?

Thanks and sorry for the messy post

[ChrisB]

Have you mounted it directly on the plastic of the frames or on a sheet of carbon or similar glued across the frame gap first?

My black mini v was mounted there and vibes were terrible,mikado recommended using a full size v bar instead and put the sensor down the bottom.

The carbon plate across the frames at the top worked better but I always found it to be a vibe troubled airframe.

Have you looked on the v bar mikado forum there used to be loads of info about vibes and the 400 on there but it might be in the v4 section.

[LaurenceGough]

Chris mentions very good points.

As you said the gear mesh can cause problems, I have seen this first hand on a Logo 400, play around with boom position until you have the least vibes, to me it looked a bit like the tail boom was angling upwards when there were the least vibes.

It's a fussy bugger to stop vibrating.

[Stanley Speel]

Thanks for the replies. The HC3SX is mounted directly on the plastic frame inc over the gap. I tried re-mounting the FBL controller, and the problem seems to have gone away . Before I try flying it today, does this look about right?

IMG_1148.jpgIMG_1149.jpgIMG_1150.jpg

I know the middle pic looks like the gears are barely touching, but I think its just the angle of the shot.

[ChrisB]

As Laurence says I found mine was best when the boom appeared to have a slight upward incline to look at from the side.

I also I think had a slightly on the loose side mesh on the gears,this was never a problem.

[Stanley Speel]

yes I made sure it had a slight upward incline this time. Didn't seem to help very much though - it certainly has an big incline now lol

[ChrisB]

Just seen your other thread,,,gutted for you

I really enjoyed my Logo 400,it flew pretty good but I did always have a vibe issue there and did find it always worked out quite expensive to fix when I crashed it.

I did try the non hardened main shaft once instead of the harder one but it was nigh on impossible to remove it again from the OWB after the next crash