Modifying 3G for better performance

[tgilton]

@akamullen - Will-do on the pics. May not get to the bench tonight, but my Rex 500 needs some other attention and I will open the 3G sensor when I get the heli fixed before the weekend.

[ForceFedDSM]

Originally Posted by tgilton

I think this is a dandy idea! It basically increases the mass of each of the three sensors and eliminates some of the vibrational modes by coupling them into a new shape. I don't like the way they cantilever the little boards out there to vibrate like saxophone reeds. I will be doing a version of this tomorrow using sticky clay instead of RTV.

I see you mentioned sticky clay, maybe sugru or the diy oogoo would work well.

[mikejr718]

Modified one sensor yesterday, flew it today. WOW I am able to run crazy high ail,ele and tail gains compared to before. This is on a velocity 50. In fact I copied the setup from the screenshots at the beginning of the thread, I gambled it would not wobble itself to shreds on spoolup. No bobbles or wobbles no matter how hard I tried. Flips form fff stoped abruptly and without bobble, tic tocs held fine. It was kind of windy and no matter how fast I got it going it did not wobble or hunt once.

[HiroboFreak]

Can somebody please post some pics.

[mikejr718]

I have another sensor to do. I will try to post pics in the next few days. If you look back a few posts I show a diagram based on a prev posted picture. I just filled in the area circled-probably a little more than is circled. I tried to push the sealer into the gaps around the sensors. I did not modify the case at all. The glob of sealer was a little below level with the two vertical sensors. Just open the sensor, apply the sealant, put it back together. I let mine dry overnite. I used Hondabond sealer as I have experience working with it and know it is a quality product and when dry still stays kind of rubbery. Thank you Leon for sharing a good idea.

Just a note- I struggled to eliminate enough vibration to get my gains as seen on the interface above the mid 50's now they are both (ail-ele) in the mid 90's tail gain went fron 70 to 78 on my jr 9303

[jondabear]

Here goes nothing.

[jondabear]

Used some stuff I was familiar with. First mod was done to the sensors , to join all 3. Next mod was done to underside of enitre unit. (Electronis board) THIS IS JUST AN EXPERIMENT! I cannot say how it will reacte in the air with this extra mod.
I can neither confirm nor deny any improvement in performance at this time.

This is on my 600 which is in pieces and I shall have her up and rebuilt by tommorrow or fri. I shall also B testing the 3g blades.

If my theory is correct, I should have the best flying 3g system that Ive ever had.

If this WERX.............IM GNA B PISSED! LOL. just kidding.

Thanx and praise to OUR MAN LEON LUKE for recommending this!

Peace!

[Hangarace]

I can't tell from the pictures what you did....... is it possible to get some clear closeups.

[jondabear]

The shiny CLEAR stuff is the adhesive. Basically just laid some over the horizontal sensor untill it touched the other two vertical sensors. In essence glueing all 3 together.

Then i laid this adhesive on the back side of the electronics board. This attached the bottom of the plastic housing to the board. I put the cover back on and screws back in and voila.

The stuff I am using can be found in electronics stores and dries to a dense , yet pliable form after curing. . Hope this helps.

BTW this is a SELF LEVELING adhesive and lays much like an epoxy but DOES NOT harden. It remains rubbery and soft. PEACE!

[Leon Luke]

Originally Posted by mikejr718

I have another sensor to do. I will try to post pics in the next few days. If you look back a few posts I show a diagram based on a prev posted picture. I just filled in the area circled-probably a little more than is circled. I tried to push the sealer into the gaps around the sensors. I did not modify the case at all. The glob of sealer was a little below level with the two vertical sensors. Just open the sensor, apply the sealant, put it back together. I let mine dry overnite. I used Hondabond sealer as I have experience working with it and know it is a quality product and when dry still stays kind of rubbery. Thank you Leon for sharing a good idea.

Just a note- I struggled to eliminate enough vibration to get my gains as seen on the interface above the mid 50's now they are both (ail-ele) in the mid 90's tail gain went fron 70 to 78 on my jr 9303

Glad you noticed an improvement!

[ForceFedDSM]

I just glued my sensors with some shoe goo and epoxied the pins in the white connector on my 250. I'll check it out tomorrow if I have time to see how it improves.

Jondabear, I have a set of the 3G blades on my 600 and they made a huge difference. They fly great. I was going to get a set of them for my 700 but I won a set of curtis fbl 710's, they also fly great, but make the heli feel a little dopey. I might try a set of the edge 693's.

[Canadian Man]

I did the same thing as Jondabear with silicone on the sensors and on the underside of the board. I hope to fly a bit tommorow and will report back. After I type this I am going to set my settings up as per the first photos from leon luke.

Cheers!

[Corrari]

What about glueing a small cube of foam between all three sensors? Is ca glue no good?

Does it have to be a certain type of silicon? I am a plumber and have plenty of roof and gutter silicone.

[mikejr718]

DO NOT USE CA GLUE!!!! The fumes from the glue curing and the fumes released afterward are very corrosive. Some mfg's of esc's and other small rc car electronics have a disclaimer in their warranty regarging this

The foam block may interfere with the alignment pins in the top of the case. With silicone they just push thru and imbed themselves.

[acidla]

Is it safe to use shoe goo on electronics?

[jondabear]

About to fly 700 w new mod. NOT gna change anything in the settings so that I have a true reference to look back at.

[malc1]

A good idea that.

Looking forward to hearing the results.

Good clear photos?

[Corrari]

Does it have to be a certain type of silicon? I am a plumber and have roof and gutter silicon and bathroom silicon on hand.

[jondabear]

No pics or vid YET.

BUT..............Holy son of a CRA%!

This mod is AMAZING on my 700. Didnt change a thing!

Heres a quick run down, Feels MORE locked in, ALOT more locked in. Helped with Cyclic movements. I make an input and....its THERE!.
Even helped with my PITCH. Thought I was just runnung a rich motor and didnt have alot of punch. With this mod AND my heli running 180 f i now have morre punch out than ive ever experienced.

THIS might be our holy grail guys!

Weird what a good sensor will do when its not fighting vibes!

VERY VERY happy with my results. wish I had tried this a LONG time ago. PEACE!:YeaBaby :

[Corrari]

Your making me jelous....I just need to know if it has to be a specific type of silicon.
As i have said, i have roof and gutter silicon galore.