Softer Dampeners for 700N

[snapshot]

I Think the title says it all.

I am setting up my 700 for F3C and the stock dampeners are too hard and all after market dampeners are even harder.

I have thought about sourcing o-rings that are closer in size but I believe that would be a compromise. I wondered if anyone has had any luck creating their own dampeners from sheet rubber of the correct durometer? If so, what type of rubber and how did you cut/punch them out?

Any other suggestions would be welcome too.

So far I have a shortened flybar with weights and g-force tuning arms.

And for those interested, I also custom paint my canopies.

[choppertastic]

Let me know how it goes as I am thinking of getting a 700 with a view to having a go at the sportsmans comps.

[paddle]

trex 700 for f3c

Hi
the rex 700 is a very good machine for f3c i have modified 2 for dave pacy for use in clubmans the main modifications where to modify the flybar carier to give more hiller input into the blades and to fit medium grade o rings to get a softer head damping, after a lot of testing we found that the standard flybar and paddles gave the best stability and control responce with the modified head, this set up make the rex a really good f3c type machine that will perform as well as some of the more costly fai machines on the market regards Noel

[snapshot]

Thanks for the info.

I think using the g-force arms will provide the same as the modified carrier.

Any more info on the o-rings would be useful i.e. what size and from where.

[paddle]

rex 700 for f3c

Hi
not sure that the gforce arms will increase the hiller input if they do the will also increase the swashplate input as well this could make the model a bit to responsive for f3c,have a look on the internet for oring supliers you want a 70 or 80 durometer oring,dave got his suplier to get some i will have a word with him and pm you the details regards Noel

[snapshot]

Thanks for the info.

The g-force arms are adjustable with 3 different settings for each ball.

washout arms: standard position, closer to mast, further from mast
SF arms: same again for both balls

If you check images 1 & 2 in first post you will see what I mean.

In fact after setting it up with the settings for F3C I now have less pitch than with the standard arms. i.e. I had set for +/-10 but without adjusting swash travel I had +/-8 which would suggest less swashplate input.

(Please correct me if I am wrong!)

[Tmac]

Were you able to get the G-Force arms in the UK or did you order them direct ?

[snapshot]

I managed to get them in the UK from rossmod they also have the high tilt flybar arms if you are into extreme 3D.

Rossendale Models | Store | G-Force Technologies

[Tmac]

More like extreme hovering so also interested in anything to calm it down.

[snapshot]

Me too

[snapshot]

Well I have managed to find some o-rings that should provide me with softer head damping.

They are 9.5mm ID with a thickness of 3.53mm and durometer of 70.

Cost, £2 for 8

They may need an extra shim to compress them a bit more, but I'll let you know how they go.

[5exi]

Where is the best place to pick up some O -Rings for a 700 head.

I wouldn't mind trying softer head damping on my 700E.

[snapshot]

Any engineering suppliers or the like should stock o-rings.

I had a local branch of Hayley's in my area.

I also had to use 2 1mm spacers instead of the normal 1 to compress the 0-rings so that it wasn't a lose fit.

[5exi]

Thanks for the info, just out of interest have you ever tried progressive head damping
I.e. one O ring a 80 and the other a 70 using the softer ring on the grip side

If so how did you get on with it.

[snapshot]

I did on the 600 and that was fine.

Unfortunately, I could only find 70 durometer o-rings! So on the 700 that is out of the question. Trying to source them on-line is a nightmare too.

The ideal size would be 9.9mm ID with a wall thickness of 3.5mm, the closet I could find was 3.54mm wall with ID of 9.5mm and 11mm, 11 was obviously too big.

So it's down to more searching and phoning to see what I can get!

Put 3 tanks through the 700 today with the o-rings and she flew great, hovered nicely with a 1500 head speed and circuits were smooth and predictable.