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HelicopterHIROBOOther › Freya Evo Tail blows out
10-09-2005 04:57 AM  12 years agoPost 1
Crashr30

rrApprentice

DFW

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I am new to Hirobo. Have been flying Vigors. The machine flies well. the only issue I have is with the tail blowing in certain maneveurs. Fast backward in to the wind and funnels to the left the tail gives up. You can hear the tail load and then give up. My Vigor did not do this so I was curios if it is because it is belt driven? I am running a 601 in 3d mode, using V-Blade 105 tail blades, 1810 headspeed. That is really the only issue I have with the machine. Any ideas??

Which gear would I change to go back to the older Freya ratio to get the higher tail ratio? What is that part number?

Thanks

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10-09-2005 05:23 AM  12 years agoPost 2
TMoore

rrMaster

Cookeville, TN

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Bump the headspeed up to 2000 and it should help. Belt drive has nothing to do with this.

TM

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10-09-2005 05:56 AM  12 years agoPost 3
kym

rrApprentice

Provo Utah

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Your belt is to loose. Hold your head and turn your tail blades, you will hear your belt snap a round the tail hub. Then tighten the belt so you have about 1/2" that you can't push in with a tool. Basically, the belt will not push together-there will remain a 1/2" gap. The key is to tighten enough that you can put some pressure on your tail blades while holding your heads and it will not slip. If you tighten the belt too tight, it will cause a lot more noise and some drag on auto rotation. I hope I have explained this good enough.

https://facebook.com/UtahHeli

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10-09-2005 10:20 AM  12 years agoPost 4
mrNoodles

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Borlänge, Sweden

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EX 17 delrin counter gear #0414-169

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10-09-2005 03:15 PM  12 years agoPost 5
Razz

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Louisville, KY

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I have been flying with the delrin 17 tooth EX counter gear, it's working excellent, less gear noise(although there is more tail rotor-whine, especially in highly loaded sideways flight). I actually am running my headspeed a bit lower at 1750, and my YS engine with the 8:45 gearing is happy. The tail holding power and sharpness has improved greatly. I fly a lot of fast backwards flight, and a big improvement was felt in that area.

I think that this 5.0 tail ratio should of been kept from the previous Freya models. There are not many pilots that want to run 'super high head speeds' for 3D, especially when using a ratio of 8:45.

I am using a 535 flybar in my Evo 90, position #2 on see-saw with inner ball position on blade grip, stock paddles with just lead weight, Radix 710's (awesome blades!) plus/minus 9.0 degrees of pitch for 3D, Revmax, Hatori SBFH 16, GY 601 gyro.

The slightly longer flybar really does help quicken the cyclics up, without having to run such high head speeds. I'm really enjoying my Evo 90!

Brian Rasmussen

DX8, Ballistic FSO, Gaui X5, Warp 360, Vbar

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10-09-2005 03:23 PM  12 years agoPost 6
rdalcanto

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Salt Lake City, UT

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I can't over emphasize the belt tension, as Kym stated. I had the same problem, happened to be flying at the same site as Kym, and he noticed me trying to figure out the problem. He walked over, grabbed the tail rotor, grabbed the main head, and turned the main head in the same direction it turns in flight. You should have seen the size of my eyes when I heard the "click-click-click" as he made my belt slip. I couldn't believe it. You have to have the belt MUCH tighter than I ever thought to make it not slip in flight under heavy load. Once Kym tightened my belt, problem solved.

On a side note, I was flying yesterday and my tail started to blow out again. I checked the belt, it was tight. Everything looked good. Eventually figured out that the clamp on the boom that holds the tail servo was slowly sliding south (we are talking a few millimeters), and I was loosing my throw to the right and starting to bind on the left. Once I recentered the tail throw mechanically so I had full right and left deflection again, and tightened the servo mount better, the tail held great again (stock gearing).

Rick

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10-09-2005 04:24 PM  12 years agoPost 7
Crashr30

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DFW

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Thanks

When I go back out today I will look at belt tension. If tight then I may try the EX gear. Thanks for the help.

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10-09-2005 05:22 PM  12 years agoPost 8
TMoore

rrMaster

Cookeville, TN

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OTOH, you might have to twiddle the tail rotor stick a little too.

TM

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10-11-2005 05:04 AM  12 years agoPost 9
rdalcanto

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Salt Lake City, UT

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For those of you that have sped up the tail, did you notice more bogging during 3D from the extra strain on the motor?

Rick

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10-11-2005 09:52 AM  12 years agoPost 10
mrNoodles

rrProfessor

Borlänge, Sweden

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No I cant say I noticed any less bogging when using the std. EVO tailgear ratio for a short while. Switching to the 17T gear gives the EVO same tail gear ratio as the std. Freyas, XSpec´s and Eagles uses.
And it has been used for awhile
The engine can take some load running on 8.45. It just pulls and keeps pulling.

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12-12-2005 01:15 AM  11 years agoPost 11
Rogue123

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Phoenix AZ

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Its funny I too do not like the tail of my Evo 90, it feels very loose. I can feel it starting to go out.

Im still in the break in phase
I have almost a gallon on my engine so its hard to say if tail vs Engine to rich. But the tail feels loose.

I was going to try NHP tails first, but this 17T sounds like a better idea. what is the price tag on it?

mrNoodles what head speed 1750~1800, also are you running a OS or YS or should I ask? and what Muffler.

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12-29-2005 11:28 PM  11 years agoPost 12
malb34

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Northern Ireland

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Alan Szabo junior runs his 601 on the F3C setting according to his video

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12-30-2005 12:03 AM  11 years agoPost 13
mrNoodles

rrProfessor

Borlänge, Sweden

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Rogue
I have my GV set at 1830rpm on 8.45 with the YS91.
Using a Hatori #937 (IMO more power than a SB16-FH), on 20% nitro and 15% AeroSave synth oil.

Also that 17T gear shouldnt cost much, like $10 or so.

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01-12-2006 05:55 AM  11 years agoPost 14
Rogue123

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Phoenix AZ

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Well I put the counter gear in, I hate those fricken push pins I should be a little more happy. I did a little PMing ,Found some stuff that was loose, tighen up, and strip Fricken plastic. IS anyone using a fan shroud on the EVO 90? I will be running at the end of this project
690mm mains and 105mm tails( Radix)
17counter gear
YS90 8.45 with a MPII with a head speed 1825~1775 cuase of the Eng/MP combo with 30%

I think this will replace my Rappy50

I only had to mod two things counter gear and fan shroud so far.

SO far so good for the Plastic Fantastic

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01-12-2006 09:14 AM  11 years agoPost 15
mrNoodles

rrProfessor

Borlänge, Sweden

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What problems do you have with the fanshroud?

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01-12-2006 10:22 PM  11 years agoPost 16
RyanW

rrKey Veteran

Edmond, Oklahoma

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I had the same problem... with the 601. I got rid of the 601 and got rid of the tail letting go. I actually prefer the Evo 90 tail over the X-Spec because you can run the longer tail blades (105mm). I think the longer tail blades offer more stability and holding power at the lower rpm than the 95mm tail blades did at higher rpm. This is just my observation...

-Ryan
Mikado USA, Kontronik, Opti-Power, MKS Servos

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01-13-2006 04:41 AM  11 years agoPost 17
Rogue123

rrKey Veteran

Phoenix AZ

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Ryan
I was thinking the same, I just couldnt wait. ( waitting on the 690mm). Im also running a 500t gyro with a 9254. Going to try it this weekend with the 95mm. Oh hey, I did pack my main hub, thanks for the tid bit at the Phx RR FF.

The fan shroud on the Evo 90 does suck, this what I did.

I took a Vigor shroud and put it on. Tons of Air going over the head I live AZ I need as much cooling power I can get.

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01-13-2006 03:34 PM  11 years agoPost 18
mrNoodles

rrProfessor

Borlänge, Sweden

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RyanW
EVO90 and XSpec has the same sized tails (bolt to bolt distance), its the EVO head thats narrower (than the XSpec head) and allows 105 when using 690mains.

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01-13-2006 04:48 PM  11 years agoPost 19
RyanW

rrKey Veteran

Edmond, Oklahoma

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mrNoodles,
I am speaking of the different gear ratios of the tail take off gears per model in conjunction with the ability of being able to use 105mm blades.

I just finished the "Evo-X" (crashed Evo added to an X-Spec) and should see how it works. I flew it with the X-Spec tail ratio, but will be putting the Evo ratio pulley in next week. I will let you guys know the results.
-Ryan

-Ryan
Mikado USA, Kontronik, Opti-Power, MKS Servos

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01-15-2006 01:27 PM  11 years agoPost 20
Rogue123

rrKey Veteran

Phoenix AZ

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Tried the counter Gear wow what a diff I had to turn down the gain on the Gyro. The holding power is perfect for 95mm. Ryan might be right about the 105mm with this gear ratio. Its a little fast, the holding power is awsome.

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HelicopterHIROBOOther › Freya Evo Tail blows out
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