RunRyder RC
WATCH
 1 page 1435 views POST REPLY
HomeAircraftHelicopterBeginners Corner › Cut blades. Can't lift off
08-05-2017 09:43 AM  14 months agoPost 1
dlancerx

rrNewbie

Aizawl

My Posts: All  Forum  Topic

HI all,

I owned a generic 4 channel helicopter with flybar. I modified the tail rod and made it longer. It flew pretty well, but was a bit on the tail heavier side. So i decided to take bigger blades from an old broken heli. But since it was a bit too heavy, I cut the blades to a smaller size. Problem is the heli won't lift off anymore. It still works well with the smaller blades that came along with it. Can anyone help?

in the picture - The red blades are the ones cut, which cannot lift. The black is the original which can lift.

Can anyone please help?



host gif online

PM  EMAIL  Attn:RR  Quote
WATCH
 1 page 1435 views POST REPLY
HomeAircraftHelicopterBeginners Corner › Cut blades. Can't lift off
08-05-2017 11:13 AM  14 months ago •• Post 2 ••
jhhyah

rrApprentice

Taipei, Taiwan

My Posts: All  Forum  Topic

Too big and too heavy blad ,not enough head speed

PM  EMAIL  GALLERY  Attn:RR  Quote
08-05-2017 12:16 PM  14 months agoPost 3
dlancerx

rrNewbie

Aizawl

My Posts: All  Forum  Topic

Does the curve under the blades has anything to do with lift?

PM  EMAIL  Attn:RR  Quote
08-05-2017 12:46 PM  14 months agoPost 4
JuanRodriguez

rrProfessor

The Villages, Florida

My Posts: All  Forum  Topic

blades might be installed backwards?

Been there, done that and old enough to know better.....

PM  EMAIL  GALLERY  Attn:RR  Quote
08-05-2017 12:51 PM  14 months agoPost 5
chopper37

rrVeteran

NJ and Long Island

My Posts: All  Forum  Topic

Looks like one of the blades are on wrong, are you using blades from a conter-rotation heli, make sure blades you pick go in correct direction

PM  EMAIL  GALLERY  Attn:RR  Quote
08-05-2017 02:47 PM  14 months agoPost 6
Pistol Pete

rrProfessor

Seffner, FL

My Posts: All  Forum  Topic

Does the curve under the blades has anything to do with lift?
Absolutely. You have a fixed pitch heli where lift is based on blade curvature and motor speed.

By making tail longer, you added weight, as you already know. For every 1 ounce you add to the back, you need 3 oz. forward.

You are also adding over 25mm of blade lenght which is heavier and more drag. Motor needs to make up for it.

Why did you make tail longer? Specially if it was already flying well.

Go back to original, problem solved.

~~Enjoying the hobby one flight at a time~~

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
08-07-2017 07:51 AM  14 months agoPost 7
dlancerx

rrNewbie

Aizawl

My Posts: All  Forum  Topic

Thanks all for the help.. The copter works qell with the stock wings so maybe i will just use those...

PM  EMAIL  Attn:RR  Quote
08-07-2017 12:06 PM  14 months agoPost 8
MattJen

rrElite Veteran

UK

My Posts: All  Forum  Topic

as prev comments have said..

As to it being a fixed pitch, on the hummingbirds and other fixed pitch hellies we used to have twist the blades by hand to add pitch..

All The Best

PM  EMAIL  GALLERY  Attn:RR  Quote
09-16-2017 11:42 PM  13 months agoPost 9
dkshema

rrMaster

Cedar Rapids, IA

My Posts: All  Forum  Topic

Yes -- the "curve" is important...it's the airfoil and is what makes the blade work.

You added a whole lot of blade, and a wider blade. I suspect the poor little motor just can't handle the extra load. Bigger isn't always better.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

PM  EMAIL  GALLERY  Attn:RR  Quote
02-12-2018 02:42 AM  8 months agoPost 10
Camp

rrApprentice

PA kinda. Mostly OTR driving

My Posts: All  Forum  Topic

Looks like an A blade and a B blade.

PM  EMAIL  GALLERY  Attn:RR  Quote
02-12-2018 01:45 PM  8 months agoPost 11
wjvail

rrKey Veteran

Meridian, Mississippi

My Posts: All  Forum  Topic

Camp
Looks like an A blade and a B blade.
chopper37
Looks like one of the blades are on wrong, are you using blades from a conter-rotation heli, make sure blades you pick go in correct direction
This. You got one on backwards.

"Well, Nothing bad can happen now."

PM  EMAIL  GALLERY  Attn:RR  Quote
02-12-2018 03:33 PM  8 months agoPost 12
Flyin for Jesus

rrVeteran

Troy, IL. 62294

My Posts: All  Forum  Topic

They've had 6 months to figure it out. Hopefully they have gotten it in the air by now.

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 1435 views POST REPLY
HomeAircraftHelicopterBeginners Corner › Cut blades. Can't lift off
 Print TOPIC  Make Suggestion 

 7  Topic Subscribe

Tuesday, October 23 - 12:25 pm - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

The RC discussion world needs to consolidate. RR is now one choice for that. Its software is cutting edge. It hosts on-topic advertising. Help RR increase traffic buy making suggestions, posting in RR's new areas (sites) and by spreading the word.

The RunRyder Difference

• Category system to allow Rep/Vendor postings.
• Classifieds with sold (hidden) category.
• Classifieds with separate view new.
• Answer PMs offsite via email reply.
• Member gallery photos with advanced scripting.
• Gallery photo viewer integrated into postings.
• Highly refined search with advanced back end.
• Hosts its own high end fast response servers.
• Hosts thousands of HD event coverage videos.
• Rewrote entire code base with latest technology.
• No off-topic (annoying) click bait advertising.
Login Here
 New Subscriptions 
 Buddies Online