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HomeScaleAircraftScale HeliScale Helicopter Main Discussion › symmetrical ver semi symmetrical for scale flight, ins & outs ???
04-27-2009 04:13 AM  9 years agoPost 1
HS10rrApprentice - Elk River, MN - My Posts: All  Forum  Topic

Hi Folks...

I currently use 700mm symmetrical blades on my scale Jet Ranger... I am interested in trying semi symmetrical (flat bottom) blades...

It would be great to get feedback from people who have used them...

What are the ins and outs...

I am running 700mm 10S2P anf 10S4P packs flybarlless helicommand...

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04-27-2009 02:43 PM  9 years agoPost 2
brokenheli

rrApprentice

gettysburg Pa.

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flat-bottom
I use a flat bottom blade from V-East they have them in 680mm and 800mm that 1 inch from 700 down to 680 will mean nothing ...the lift u will get will be like running 750's.....give Sandy a call at v-east..Kevin

never stop learning

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04-27-2009 03:50 PM  9 years agoPost 3
marc28

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new york

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Be careful...Flat bottom blades with a flybarless system puts additional demands on the servos due to pitch down tendencies of the blades.The gyros have to correct and fight this.You dont need them if you're using the heli command

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04-27-2009 04:41 PM  9 years agoPost 4
HS10

rrApprentice

Elk River, MN

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marc28

This is very good information, completely new to me... THANKS

My scale goal is run a lower rotor speed with decent lift... I fly low and slow patterns...

The helicommand has been great for slow & smooth realistic maneuvers...

I was hoping the flat blades would allow a lower head speed and retain good flight characteristics...

I seldom fly high and fast with it...

One problem will be tail rotor authority...

Logo 14/24 (Agusta 109A-MKII) (MH-6 Little Bird) (OH-58A) Navy - Retired

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04-27-2009 04:45 PM  9 years agoPost 5
falcon

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UK

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If you only fly in flat calm conditions you will be ok with flat bottom blades but if it is windy you will have some great fun trying to hold a steady hover or level flight.
Semis arn't as bad but i still wouldn't use them.

www.m0kwr.com

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04-27-2009 08:36 PM  9 years agoPost 6
marc28

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new york

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Keep in mind,flat bottom blades give more lift with less pitch.Lowering the head speed would effect this.What is your current HS,gearing

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04-27-2009 10:25 PM  9 years agoPost 7
Richard Morgan

rrApprentice

Virginia Beach, Virginia USA

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my experience with Semi Symetrical
I am running two helis with Semis. One has a five bladed OF head with Semi Blades and the other one a three bladed Hirobo head with semis. All I have personnaly seen is a lower headspeed with increased lift and stability. The OF head has a Helitronics unit on it and the Hirobo has no electronics. Maybe I just got lucky?, but I love the way they fly, wind or not.

Richard

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04-27-2009 10:51 PM  9 years agoPost 8
HS10

rrApprentice

Elk River, MN

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Richard Morgan & marc28

Thanks for your response...

I will use the optical tach next time I fly, but I think 1300 - 1400

The current helicommand system seems to handle the wind reasonably well...

Here is an old test video...

Watch at YouTube

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