Raptor 30 headspeed???

[Thomas]

On a R90 with an OS91 you want to be aiming for a gear ratio of 8.27 so it means getting a 91t main gear.

I've got the 91SZ, with an 8.27 ratio and the RevLock set to 15000 and 16500 in mode 1 and 2 - it goes like stink now it's run in - with no bogging at +12 pitch.

Your motor should cope with a smaller main gear which means it will be quieter and save fuel.

It's also well worth spending time sorting out all the mechanical linkages and getting the washout levers parallel at zero pitch - all helps to make it fly better.

[Ade_Law]

wrong way Thomas,

the 93 tooth gives 9.45 which means less head speed for the same motor speed.

15000rpm is the ideal speed for the c-spec etc for max power.

if your just hovering you can slow it down a bit. somewhere around 1600rpm on the head.

i am betting its more of a pitch curve/servo problem tho

Ade

[Smoothound]

1500 if that is what the revlock is set to...

[Smoothound]

1500 if that is what the revlock is set to...

[Thomas]

Um, I know I'm still wet behind the ears when it comes to helis but I can do maths and 91 divided by 11 is 8.27

93 divided by 11 is 8.45

What did I get wrong?

[Fixer]

wrong way Thomas,


i am betting its more of a pitch curve/servo problem tho

Ade

I have the blades set at -2 +5 + 10 or very near.
The radio is standard, 0 25 50 75 100 for pitch and curve.

I did have a bit of a problem trying to get the swash, washout level at mid stick, I would say its two marks from midstick before there all in line.

Before I fitted the revlock I found it very easy to hover a foot off the ground, now it jumps up to hover them I'm up and down like a yo-yo.

So what gear should I go for to keep it slow and quiet?

[Thomas]

It could be that you have a little to much pitch when the reclock kicks in and it pops up - I can only tell you ho mine is.

Make sure at mid stick there is no pitch, so your curve should be -2, 0, +10, all flight modes should have the same pitch curve.

Then when you are at midstick and flick it to idle up 1 the only thing that will happen is that the head will get faster regardless of ratio!!

If you have a bit of pitch and power up the head with the gov the thing will jump up.

Bigger gear will mean higher RPM - small main gear lower RPM (on the motor that is). Get the 91T and 11 pinion combo, well that's what the 90 guys told me to buy

Does that make snece? - if not blame th beer

[Fixer]

Thanks Thomas

Think I might send this one in for a setup at my local shop, I think this one deserves it.

Every one seems to have there own way of setting Helis up and I am just bewilder :?

I will have another go at the blade pitch though and see if that makes it better.

[Thomas]

Good idea, they can drive you mad after a while. I'm lucky as we have a Raptor 90 nut at the club.

You'll like it once it's working well.

[Ade_Law]

fixer, bring it to clubman3d next weekend. were doing a free clinic. We will help you get it setup spot on.

Thomas, pitch curve should always be a straightline.

Fixer, although your pitch curve is straight the fact you have -2, +5, +10 suggests that your endpoints, subtrim and mechanical setup isnt right.

Start by resetting end points to 100/100 and zero the sub trim.

bring the collective stick up to mid stick.

put arm on the servo so it sits at 90degs to the pushrod.

adjust the length of the pushrod from servo to the collective lever so the washout arms are level

adjust the long links from the swash up to the mixer arms on the flybar carrier so the balls are parrallel to the flybar.

adjust the short links from the mixer arms on the flybar carrier down to the blade grips to give zero degs pitch.

this, with the right length servo horn will give you +/-10 degs with 90-110 end points.

if you want less bottom end pitch adjust it in the curve, but make sure its a nice straight line. Forinstance, if you wanted 0, 5, 10 you would bring the bottom point up to 50, middle to 75 and 100 on the top.

Ade

[Fixer]

Thanks Ade

We can always rely on you to come to the rescue.

All my end points are at 100 with no sub trim, I thought this was down to the coreless servos. Its looking like mechanical setup so I'll go through your instructions tonight and let you no how I get on.

Clubman3d, is that held in Nottinghamshire?

[Ade_Law]

10mins north of retford

the key is to get the servo horn 90degs to the pushrod.

Ade

[Fixer]

Good Afternoon All

Well Ade, I managed to find time today to go through your setup instructions and I must admit everything was out but now I have everything set how it should be I get -6 0 +6, with the end points at 100. What have I done wrong?

I did notice my elevator control arm has no adjustment but in the SE manual it shows it with link rods and ball links at the swash end, at -6 low stick the washout has about 3mm clearance from the guidance ring on the head.

The sun is out and with very little wind so I am dying to get out there.

[Disc]

Fixer:

Its a rod adjustment you need not sure which one's though to give
more movement.

Also get used to taking off into hover engage the throttle jockey and
after flying around return to hover and then dis-engage the throttle
jockey otherwise she will be a bugger to land with a higer head speed.

[Fixer]

Fixer:


Also get used to taking off into hover engage the throttle jockey and
after flying around return to hover and then dis-engage the throttle
jockey otherwise she will be a bugger to land with a higer head speed.

No can do, if you mean the Rev-Lock it's on manual, I dont have a spare channel for the Rev-Lock because I'm using the FS8 Co-Pilot.

Im leaving the rod adjustment alone now until someone comes up with a solution,