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HomeAircraftHelicopterThunder TigerOther › Need tips on speeding up an R90
10-11-2005 03:35 AM  12 years agoPost 1
loewermx

rrVeteran

Alexandria, La

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Ok Guys, I want to speed up my R90 and I am not sure what the best way to do it. Here is my setup:

R90 STD
OS 70
TG head
Red dampners
94758's all around
TT 680's
White MA paddles
1800 hs
I also run no expo


It just seems slow when I flip it. I would like it to flip with blazin speed! I am just looking for a few suggestions on some ways to speed it up soooo, tell me what ya got.

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10-11-2005 03:48 AM  12 years agoPost 2
Wa11banger

rrElite Veteran

Huntsville, Al

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your running a 70 so a little low on HP .. What cyclic pitch are you running I am at 7.5 with 95mm V-paddles and it rocks and rolls.. Another thing you can do is change up the bell hiller mixing levers ratio by using the inner hole.. This is more for blades but does have a nice side effect on the paddles as well.. HS will also make a difference in the speed at which your heli performs manuevers I am currently running 8.27 gear ratio with a HS of 1850.. Makes it come alive... The white MA paddles are better suited for 50 sized birds.. If none of the three suggestions above work (cyclic pitch to 7.5, mixing levers change, and HS) I would suggest going to 90 or 95mm V-paddles or the new red paddles by TT.. A buddy is using them and said it made a nice diffference. I run all V-paddles for smoothness but I also bought them all before the reds were released. I have heard they are smooth as well.

Good luck..

Oh and your collective timing has alot to do with it as well if you are off time with your collectve in your rolls you could be loading the disk with that 70 in there..

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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10-11-2005 04:20 AM  12 years agoPost 3
loewermx

rrVeteran

Alexandria, La

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Thanks for the reply,

I tried to move the mixing levers to the inner hole but the lever hits a bolt head that holds the seesaw in place. I am not sure of the deflection on the cyclic but its a good amount. I will check tomorrow.

I think I have a set of Vpaddles so I might try those. I have used them before but they are kinda pitchy. They are the first version.

I already have a YS91 to go in it but no muffler yet, what would be the best choice? I will be running 8.45 ratio

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10-11-2005 04:22 AM  12 years agoPost 4
loewermx

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Alexandria, La

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Also, is there a shorter flybar avaiable? Mine seems pretty long compared to others.

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10-11-2005 04:41 AM  12 years agoPost 5
Billy Zimmerman

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Rainier Oregon

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Correct me if Im wrong but I believe a longer flybar will create faster cyclic response, so you might want to keep your longer fly bar.

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10-11-2005 05:34 AM  12 years agoPost 6
Wa11banger

rrElite Veteran

Huntsville, Al

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Billy is very correct.. One of the reasons new helis are coming out with longer and longer flybars.... to get more cyclic control..

Just my .02
Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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10-11-2005 05:43 AM  12 years agoPost 7
Wa11banger

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Huntsville, Al

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I run an MP2 on my YS91 at 8.45 ratio. That will put you at 15632 engine rpm with 1850 HS... IMO thats a bit high but not terrible as 8.27 ratio only brings it down to 15300rpm. The engine is rated for more like 17k as a ceiling, but we'll never get it there. I like the MP2's but they are picky about the power band, but when your tuned and pitched right you have a very powerful combo.. A more forgiving combo is the SB17 it has a wider powerband plus a smoother and quieter sound.. I just like the MP2 better, one for price, and two I think it sounds cool so to hell with quiet lol

Vpaddles are only pitchy when they are misaligned.. ensure you have them lined up proper and you wont have any tuck or lift tendencies at all. All paddles get that way when misaligned I know I am the king of misaligning them.. I finally broke down and got a set of paddle alignment bars.. Worth their weight in gold if you ask me.. Took a heli I had been fighting a tuck in forever to one with no bad tendencies in a single flight.

Rick

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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10-11-2005 05:50 AM  12 years agoPost 8
BPFlyer

rrApprentice

Wichita, KS

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Ref the bolt problem: You can swap out the bolt to a "mushroom" head style if yours didn't come that way. My SE kit had it stock.

I also had to purchase the metal mixing levers to get the inner hole to work without grinding on the stock plastic levers.

Some change was noticed from these part swaps, but head speed and blade/paddle choice is just as important. In combinations you can achieve decent cyclic speed.

Don't forget to consider your distance from center on the cyclic servos arms as well as the speed rating for your cyclic servos with your battery voltage rating. IE 4.8V, 5.1V or 6.0V.

Fly it like you stole it!

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10-11-2005 01:48 PM  12 years agoPost 9
loewermx

rrVeteran

Alexandria, La

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Thanks Guys, I will try these suggestions and report on the difference.

I must have been backwards on my thinking about flybar length. Thanks for the correction.

Scott

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10-11-2005 03:41 PM  12 years agoPost 10
loewermx

rrVeteran

Alexandria, La

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Thanks Alexander, thats what I was looking for. I found my Vpaddles so I will be modifying the mixers tonight.

What ball link is used when drilling the new hole in the mixer arm? Is the stock one long enough to put a nut on the backside?

Scott

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10-11-2005 06:11 PM  12 years agoPost 11
Rafael23cc

rrKey Veteran

Junction City, KS

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Do not own a R90 I do own R70 and R50 but my post is not related to that.

A shorter flybar will give you a faster respose rate. Look it up in any Physics book, gyroscopic forces. The closer the weight is to the center of the fulcrum, the faster the response is going to be.
Aerodinamic forces apply here too since the paddles have airfoils.

If you want to correct me, then tell me that the combination of the aerodinamic forces and the gyroscopic forces make the longer flybar react faster. Which I do not think is possible.

Rafael

Keep your feet on the ground, but your eyes on the sky.
Team Heliproz.com

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10-11-2005 06:35 PM  12 years agoPost 12
loewermx

rrVeteran

Alexandria, La

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I thought that the shorter flybar would make it faster but I was not 100% sure. Does anyone know if there is a shorter one that I can put on there?

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10-11-2005 06:44 PM  12 years agoPost 13
rkeith2

rrVeteran

Norco, CA

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Cyclic control speed
Shorter is faster - longer is more stable.


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10-11-2005 07:12 PM  12 years agoPost 14
Wa11banger

rrElite Veteran

Huntsville, Al

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I am not trying to be difficult but I dont see how shorter would be faster.. Less weight yields faster response this we all agree on.. I agree that a shorter flybar would have less flex to it.. But if sort is faster why does the new Evo90 which rips in rolls and flips come with a longer than ever flybar.

Proud member of the Quick UK, Duralite Flight Systems, V-Blade, & KBDD team

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10-11-2005 07:19 PM  12 years agoPost 15
Wes Crockett

rrApprentice

Bourne End, Buckinghamshire, UK.

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You guys are right to an extent but I dont think things are quite as simple as that.

As far as I've been told (and found out for myself by test flying), a longer flybar gives more stability but can also speed up cyclic response as well since the paddles are further out and therefore travel faster. How much it speeds up the cyclic is affected by how the rotorhead is setup eg. paddle deflection.

Sorry, don't know any formulas but seems to work on my raptor 90.


Wes

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10-11-2005 07:50 PM  12 years agoPost 16
Al Austria

rrElite Veteran

Sacramento, CA - USA

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Shorter is faster
Wrong. Theoretically, a longer flybar is more stable as well as faster. Viceversa goes for a shorter flybar.

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10-12-2005 05:54 AM  12 years agoPost 17
madman22

rrApprentice

Alexandria Louisiana

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whatever just fly

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