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JR-Spektrum . Gyro Hobbies . E-flite

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HIROBO Freya - Sceadu - Shuttle > Sceadu Main Gear Stipping
 
 
fitenfyr
rrProfessor
Location: Port Orchard, Washington

Hot starts and liners...

Just to clairfy. The 2 hot starts I have had were both about 1 second in duration (long enough to start that OH &@%#* and grabbing for the fuel line, throttle what have you) both were operator error.
The thing I noted about them was that the liner was COMPLETELY gone. Not just a little but the OS 50 took it all during those.
Now I have hot started the Freya and the Raptor with little to no liner removal.
This is not a big deal just something to keep in mind.
I actually didn't think I had toasted the liner the second time till I tried to hover and the heli was loosing headspeed and actually caused a flutter when I was trying to set it down.
I have used liners from Hirobo and even a R60 liner (I was too impatient to wait after the first one. New heli and all).
Like Jeff said just cut them down and make sure you get the proper clearance inside so the liner and clutch don't drag.

Jason

Jason Stiffey
Fly Fast....Live Slow...
03-22-2002 Over year old.
HOMEPAGE  
 
 
Greg Takacs
Veteran
Location: Fort Worth, TX

jrice45516

As far as the headspeed goes, here is my take:
When my Sceadu was set up initially "by ear" the headspeed ended up around 2K and during descent in idle-up it would overspeed above 2K which has caused some visible vibration on the helicopter as well as flutter.
Once it was set up by a tach my headspeed is at 1650 which might be low for some but seems to work for me. No flutter or vibration at this point.
I run MS600 blades and probably will try some V blades in the near future......
03-22-2002 Over year old.
HOMEPAGE  
 
 
jrice45516
Heliman
Location: SoCal

thanks for the info

Just a question & a comment.

question
When you say "flutter", do you mean the same thing I mean, namely the flutter nicknamed "woof" which is an out-of-track condition with the bladetips ~2-3inches or more out of track causing Major shaking of the airframe, sometimes bendind of the spindle, & sometimes poof (i.e. in-flight boomstrike). This is not some annoying little vibration; it is violent. Asking just to make sure we are talking about the same thing.

comment
Woof has occurred here with many popular blade brands including stock woodies, CMT's, NHP's, SAB's, etc. I mention this only to counter the misconception of some that certain blade brands are either automatically woof-free or automatically the cause.

If I'm telling you anything you already know, just ignore me. Sorry to interrupt the subject of maingear stripping; just trying to learn more about other peoples' experience with woof.

Dances With Woofs
03-23-2002 Over year old.
 
 
Greg Takacs
Veteran
Location: Fort Worth, TX

What I was describing was something where the heli would start shaking and you can hear the blades making the fluttering sound. I did not see blades out of track and I did not have a boom strike either. Note that I only experienced the above upon descent in idle-up with high (2K+) rotor rpm.
03-23-2002 Over year old.
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hirobox
Heliman
Location: DFW

Main Gear

The real question is will this problem be repairable, or will you need a cash of main gears,to go flying......
03-25-2002 Over year old.
 
 
Greg Takacs
Veteran
Location: Fort Worth, TX

The gear problem has been fixed by both Altech and Hirobo. The Sceadu 50 (most prone to stripping) now comes with the DTDS gear set and a 3rd bearing block in the US.
In the meantime Hirobo has designed a much stronger reinforced main gear that will fit the Sceadu 30 and the Sceadu 50s in other parts of the world where they don't come wirth DTDS.
The new gear is not in the new kits yet, but will be shortly. In the meantime if your current gear fails, give Jeff Green a call at Altech and he'll hook you up with a new one (the reinforced one). So it is no longer an issue with the Sceadus thanks to the manufacturer and distributor listening to their customers. Part of it is RunRyder being here allowing us to run our lips and discuss issues with these birds in the open.
03-25-2002 Over year old.
HOMEPAGE  
 
 
MitchD
Senior Heliman
Location: Antioch TN USA

Slight correction;
A couple of people had main gears strip for different reasons.Altech is replacing gears on a as needed basis without any hassles.Read On.
A lot of us have been flying the Sceadu 50 stock, without any upgrades, up to the time the DTDS came out without any problems.Without any maingear failure.
The white dust seen at the back of the gear is exactly what it is and has no effect on the machines performance.It goes away after the drive train is "broken" in.I've been flying mine since it hit the states with no "issues" or "problems",The DTDS/Bearing Block is a added feature for US Buyers.
There never was an issue with the stock gear,and Hirobo decided to add some supports to the molded gear to improve on its overall "life expectancy"so there wouldnt be an issue later down the road.
If for some reason one does need one,Altech will handle it to ensure there are no problems and the stock one does work fine.Main Gears strip for a bunch of different reasons besides "just flying around".
The MS600 Blades have had a high instance of flutter problems on the Sceadu 50,but none yet w V's.although Pitch curve problems,setup, and pilot inputs can also cause "flutter",along with unhappy blades.
03-25-2002 Over year old.
HOMEPAGE  
 
 
hirobox
Heliman
Location: DFW

Main gear

Greg, just wondering are you a pilot rep. Also what other Hirobo machines do you fly? Do you attend any fun flies, if so witch ones.

Regards
H
03-25-2002 Over year old.
 
 
Greg Takacs
Veteran
Location: Fort Worth, TX

Nope, I'm not a rep, I do not own any other Hirobo (or other brand) helis and I will be attending the Hirobo fun-fly in Dallas as well as Heli Heatwave at the Ft. Worth Thunderbirds field in Benbrook, TX in August.
03-25-2002 Over year old.
HOMEPAGE  
 
 
fitenfyr
rrProfessor
Location: Port Orchard, Washington

Another slight correction...

Mitch,
I have to disagree with you. Their is a problem with that stock main gear for the 50 or Hirobo wouldn't have replaced it.
I have seen one come apart at the hands of one of our reps in the area. He wasn't doing anything "wild" just mild loops rolls and some backwards stuff. The gear came apart in mid flight (2nd time it has happened to him) Now everyone that visits this board knows DrScoles and I don't think his problem was setup or poor flying style.
I was spotting for Mike at Vegas when the last one let go. He was using V-blades as per his normal. Man if you have to crash this one was spectacular!!!!!
As for the white dust. Yes you are correct some amount of dust is too be expected with any gear breakin, but what myself and others have seen seems excessive and on a "problem" gear to begin with it is something to raise your caution level.
Not trying to flame you or knock you down on this one. I just think that this part is a bad item and people should not be flying the higher HP 50 motors with it (I also feel the 30 one should be replaced, but that IMO)
The newer black gear that Hirobo is replacing the stock white one (not the DTDS) from what Mike has said is much better built and an excellent replacement. I have the DTDS and the modling and plastic seem of much better quality than the initial stock stuff.
I am glad to hear you have had no problems with yours. Just out of curiosity when did you get yours? I know you are a rep just wondering if yours was an early production run or maybe a later one.

Jason

Jason Stiffey
Fly Fast....Live Slow...
03-25-2002 Over year old.
HOMEPAGE  
 
 
Greg Takacs
Veteran
Location: Fort Worth, TX

nutswinger thught the gears are fine, it's just that some people don't know how to tighten the screws on their chopper........

fitenfyr, the DTDS gears are not molded but machined so that is why they feel so much better, they are made the same way the Freya upgrade delrin gear is.
03-25-2002 Over year old.
HOMEPAGE  
 
 
helitroll
Senior Heliman
Location: Southlake, TX

main gears

I have been flying my Scaedu 50 with stock gears for about 2 months with 3-4 gallons thru it. I had no problems thru light acro to include inverted and flips, rolls, loops. I used a governer with a head speed of 1650. My gut feel is the head speed is a big factor in the gear failures. I just upgraded to the DTDS and 3rd bearing block. I have not flown it yet due to work and wind.
03-25-2002 Over year old.
 
 
squirrel
Veteran
Location: South Whitley, IN

The head speed does not contribute alot to the load on the gear. When you are pushing the envelope with extremely radical cyclic pitch + collective pitch the Heli tends to rotate about the main shaft. Now the additional force of tail rotor holding the heading constant acts like a " long wrench" turning an imaginary bolt (the axis of the mainshaft) this increases the force with the same sign as the force generated by the engine, this means the forces are added together. If the tail would be allowed to rotate unrestrained the total force on the gear would be alot less.

When you are doing very radical tumbles, stationary rolls flying , flying flips and etc. You have an etremely heavy load on the main gear from the (+ 20 or -20) degrees of pitch(frictional force) + engine torque + torque about the mainshaft induced by the tail rotor. In other words alot.

Fred
squirrel
03-25-2002 Over year old.
HOMEPAGE  
 
 
MitchD
Senior Heliman
Location: Antioch TN USA

Mine came in in the first shipment,when I got it Jeff G asked me to "push" the machine to look for any problems.The machine was flown by myself and any one who wanted to fly it.It was stock w no upgrades.
I know Mike S had lost a gear,and a few others have claimed to have on runryder also, but the point being is that doesnt make every gear in every machine bad or an issue.Like greg claims it to be.If you read back its almost like hes begging people to just post anything about a gear stripping.The poll doesnt look like its in his favor.....Bottom line is JeffG worked w Hirobo to make it more durable based on product dependability desire,and to have it fly fine "outta the box"not because of a runryder poll or several incidents of failure.If someone has a problem Jeff will take care of it for US bought kits.Its not a "gear giveaway because the stock one is bad" as greg implies.
03-25-2002 Over year old.
HOMEPAGE  
 
 
Greg Takacs
Veteran
Location: Fort Worth, TX

MitchD and the others,

I did not write or meant to imply it was a gear giveaway, and I am truly happy the way the post has turned out as it clearly showed that it is not a major issue with the Sceadu, and Hirobo has fixed it before it even became one.

"If you're having issues with the stock white gear ask Jeff Green for a replacement with the new kind. "
"In the meantime if your current gear fails, give Jeff Green a call at Altech and he'll hook you up with a new one (the reinforced one). "

I think the above two sentences clearly say if your current gear failed on you, Altech will replace it at no cost, it says nothing about everyone with the older gear having to rush to Altech and demand an upgraded gear. It is getting old that people are reading implied meaning into my posts.....
03-25-2002 Over year old.
HOMEPAGE  
 
 
DrScoles
Veteran
Location: Redmond WA

I can't believe you guys are still talking about this! Anyone who owns a Sceadu 50, either has the new gear and third bearing block, or is eligible to receive one through altech... I bet you there isn't a single person who has stripped one of the new gears w/ bearing block...

I had probably one of the most volatile set-ups possible with the OS50, MP and 30% CP... This set up was probably generating around 2.5 HP... I am not sure if the designers at Hirobo anticipated this... Whether they did or not, Jeff Green made a quick decision and everyone benefitted from it. You're getting two upgrade parts for free. Even the Sceadu 30 buyers benefitted because they're getting a great set of fiberglass blades...

This topic is history!

Let's go back to arguing about ginger and maryanne...much more constructive

Mike
03-25-2002 Over year old.
 
 
MitchD
Senior Heliman
Location: Antioch TN USA

Agreed Mike!
Ginger was BI
03-25-2002 Over year old.
HOMEPAGE  
 
 
fitenfyr
rrProfessor
Location: Port Orchard, Washington

DEFINATELY!!!!

Gotta love the Sceadu!
Mitch,
As I said wasn't trying to knock you down.
I think you are absoulutly right about the gears. That is why I was curious when you got yours. Mine was from what I would call the second batch of kits to hit the states.

Mike,
You setup is not volitile. JUST YOUR FLYING!
See ya sometime soon now that spring has sprung.

Jason

Jason Stiffey
Fly Fast....Live Slow...
03-25-2002 Over year old.
HOMEPAGE  
 
 
irq
Key Veteran
Location: San Diego, CA

How can I tell if I have the "fixed" main gear?

I just bought a Sceadu 30 kit from a store in the US. How can I tell if the main gear I have is the "fixed" one? It is white, and is made out of plastic. And also, what is DTDS?
03-27-2002 Over year old.
 
 
fitenfyr
rrProfessor
Location: Port Orchard, Washington

Your gear should work fine...

The gear is the same between the 2 helis. The problem is when it is installed in the 50 size heli. Your's should work fine.

The DTDS is the driven tail system (direct tail drive system is the correct acrynom I think). It will make your tailrotor still spin during an autorotation.

Jason

Jason Stiffey
Fly Fast....Live Slow...
03-28-2002 Over year old.
HOMEPAGE  
 
 
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HIROBO Freya - Sceadu - Shuttle > Sceadu Main Gear Stipping
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