RunRyder - What's wrong with 570mm blades on a Sceadu 50?

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HIROBO Freya - Sceadu - Shuttle > What's wrong with 570mm blades on a Sceadu 50?

jbrundt
Veteran
Location: St. Charles, MO

What is wrong with the FRP 570mm blades that come with some of the Sceadu 50's? Are the junk? Do they not work? If you do use them with an OS50 are you just asking for trouble? Why would have Hirobo included them if they were not adequate?

I'd hate to buy a 50 with them just to find out I wasted my money.

Lots of questions, too few answers.....

02-10-2002 Over year old.

HOMEPAGE

Greg Takacs
Veteran
Location: Fort Worth, TX

Here is my take on the 570 blades that come with the Sceadu.....

(1) They were tailored for 30 size helis, you can see that by having the default hole diameter set to 3mm with the brass inserts. They provide the 4mm ones too but they are not installed by default.

(2) They are too short for the power of the OS50. You will have to tone down your max throttle close to 80% on the OS50 not to overspeed these puppies.

(3) They are semi-symmetrical. It means that they do not generate the same amount of lift in inverted as they do in right side up. While this is OK for the mild 3D-er (loops and rolls) if you want to do more you'll probably want some symmetrical 3D blades.

Now for the good part:

(4) They are no longer included with the Sceadu 50. At least in the US. After the initial feedback of US fliers Altech has decided to take out the blades from the package and add the DTDS and 3rd bearing block instead, making it an even better deal! You can pick your own blades now and you don't have to worry about owning the 570mm blades any more.

(5) They are included with the Sceadu 30. Since Altech was stuck with a whole bunch of 570mm blades having removed them from the Sceadu 50 so they decided to give these to the Sceadu 30 owners for a $5 increase in price. It's a pretty good deal if you ask me.

I hope I could answer your question, at least from my perspective......

02-10-2002 Over year old.

HOMEPAGE

flyboy99
Heliman
Location: Atlantic City, NJ

Sceadu 50 Blades

What width 600mm blades would you recommend?

02-10-2002 Over year old.

ampex456
Senior Heliman
Location: Bayville, NJ

Easy there :)

To answer your question about the blades, nothing is wrong with them. If you fly them at their rated RPM around 1850 to 1900, they will be very aerobatic. While autos will suffer a bit, the aerobatic performance will be justified. True they are semis with a mild washout, but a little adjustment will make them work. Other MRC reps are using them with good success and sticking with them. FYI my roll rate with 600 & 620's is not as good as it is with the 570's. The setup may need to be tuned in finer, but that's what the data sheets at the US Importer site are for, www.modelrectifier.com. If you have them, try them before your just decide to dump them. You may be surprised. I was.

And contrary to to Greg's statement, we are not sitting on a bunch of them because they are no good and we are stuck with them

. In fact I could use more.

They were added to the thirty because I feel the 550's did not lift the model as well and wanted to give the US kit some added value.

Try them first and make an educated decision for yourself.

If you have any more questions, give me a shout.

Jeff Green
MRC/Altech/Hirobo

02-11-2002 Over year old.

Greg Takacs
Veteran
Location: Fort Worth, TX

I have tried them and didn't like them

I'm happier with the 600s.....

But I have sold my 570s here for $50, and the guy who bought them said he liked them so much he's ready to stock up on them. Like I said it was my perspective......

02-11-2002 Over year old.

HOMEPAGE

ampex456
Senior Heliman
Location: Bayville, NJ

Here here :)

All Subjective

Jeff G

02-11-2002 Over year old.

vetrider
Elite Veteran
Location: Daleville, AL (Ft.Rucker)

I likes um

I got the blades from Greg and another set from JPBIII. I plan on putting one set back on the sceadu 50 and the other on my Bell 222 when I get it built. I think they'll do very nicly on it. Jeff is right, they roll great but I'm getting that info from my flying buddy as I don't do rolls yet........ except by accident!

My bud says the scedu 50 will do nice rolls and loops in normal flight mode with the stock setup.

Pitch set at +13/-11 @ 80% throttle - 15% cool power - weston 50 pipe.

Magnum Fuel

02-11-2002 Over year old.

Taipan
Key Veteran
Location: Sydney, Australia

Greg, you forgot to say that written all over the blade packaging is '30 FRP MAIN BLADE.'

02-12-2002 Over year old.

EChapkis
Veteran
Location: Tampa, FL

Blade size in relation roll

Interesting thread! I have a GPH with CMT glass 600's and I have 8 degrees of cyclic and the roll rate is too slow. Also the paddle weights have been removed.

I never considered blade length being a criteria for roll rate. I just created a cyclic to throttle mix to increase headspeed during the roll so we'll see if that helps. Maybe drop the blade size down to 570's?

What do you guys think? Engine is a OS 46SF on 15% PowerMaster 23% oil. Thanks!

Evan Chapkis Tampa, Florida

02-12-2002 Over year old.

JSaleska
Senior Heliman
Location: Navarre FL

Don't forget people that the roll rate and the flip rate is a combination of Paddle design, Paddle Weight, Blade weight, Blade design. You need to have a nice balance of stability vs. mobility. Speaking in generalities a lighter setup will give you more mobility, but sacrifises stability. The reverse is generally true as well.

So with all that said.
The Shorter 570 blades which are fairly light will of course have a better roll rate then the longer and heavier 600 blades. Conversly the 600 will hold more energy during autos, and will be more stable during hovering manuevers. Of course I know that this isn't always true, and the blade chord and profile adds to the equation as well.

I hope this helps some of you, and if not then I hope it sparks some more conversation to the same.
Jon

02-12-2002 Over year old.

HOMEPAGE

ampex456
Senior Heliman
Location: Bayville, NJ

Hey Evan!

That may be problem if you really do have eight degrees of cyclic. AT 1/4 stick points roughly 4-4.5 degrees adding 8 degrees of throw to it would bog it as your motor could probably only handle 8 degrees for a 1750 1800 head speed for aerobatics. If the motor lugs, roll rates will suffer and that shows up more than flips.

Any Hirobo heli gets around smoothly at 5 degrees of cyclic, 1750 to 1900 head speed with moderate paddle weight. Paddles get the heli rollin' and blades finish the job with authority. Its a balance.

.02

Jeff G

02-12-2002 Over year old.

EChapkis
Veteran
Location: Tampa, FL

cyclic throw

OK, now I see it more clearly! We set the throw at 0 pitch. I will check it tonight at 1/4 and 3/4 stick and adjust for 4.5-5 degrees. That does make sense as the flip rate was very good.

I estimated the head speed to be about 1600-1700, but now that I added the cyclic to throttle mix, I the head speed will increase during the roll.

Sounds like we found the problem! Thanks guys!!

Another question......

Obviously all blades are not created equal. I am not sure if the 600 CMT glass blades are symetrical or semi. I also do not know how they compare to other blades such as v blades for example. I see that the V's are available in a narrow and wide cord in the 600's. What is the difference? At what these blades cost, I don't want to buy the wrong ones. Keep in mind that the CMT's are considerably better than the wood's that were on before.

OK, I checked the HHI web site and the blades I do have are symetrical.

Evan Chapkis Tampa, Florida

02-12-2002 Over year old.

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HIROBO Freya - Sceadu - Shuttle > What's wrong with 570mm blades on a Sceadu 50?

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