Fixed Pitch Blade Fix..... - RC Groups
Thread Tools
May 25, 2004, 08:50 PM
Blade Springs "Rock"

Fixed Pitch Blade Fix.....

I came up with the idea today. I know about rotor dynamics, I was thinking the micro helicopters sometimes just don't have what it takes to keep the blades in line, and like a lot of other mods posted here to do so. I invented the spring mod for the Aerohawk and the like90's blades. I wanted them to be loose and still get a good tracking, I believe the blades are so light that the centrificial force will not realign them in flight they simply need help. Most everyone in the fixed pitch blade world knows that you have to start your heli with the blades slightly forward, the springs automatically do this, and talk about cheap: 1.69! In flight the dreaded wobble, I still get it in a hover until now, the springs keep the blades in perfect alignment.......Initial hover checks were very nice......better vibrations......and I feel this is it.....the mod of all mods.......

Spring wire: .039, wrapped it around a .250 make it.....

Bought it for the adjustable swashplate mod. Two in one......for the money.

Maybe this is the fix for forward flight wobble and crash......I will attempt to fly it forward flight soon and post the results.....this is the smoothest and easiest hover I've ever had with the Hawk......I am now confident this bird will fly and fly with confidence....

I bet you didn't even notice my landing gear o-ring mod either......this really plants the bird on crashes yet....
Last edited by Geoffrey109; May 30, 2004 at 11:20 AM.
Sign up now
to remove ads between posts
May 25, 2004, 09:37 PM
Registered User


cool ,simple and cheap idea.
Did it work?
Probably going to need a stop to arrest foward movement .

IMO the blades dont have the mass required to recenter from lead/lag.
Weighting them increases the inertia not a good thing on FP.

May 26, 2004, 12:59 PM
Blade Springs "Rock"
BOO YA!!!! This is the best I've seen the Aerohawk fly to date. The springs kept the blades in perfect alignment and elimanated the hover wobble and vibrations. The blades are loose and didn't have to make any adjustments at all, sit it down and get to hovering everytime perfect! Aerohawk owner's This is a must mod, for the like90 blade setup........
May 26, 2004, 01:24 PM
Registered User
EddieNewYork's Avatar
That's interesting, what kind of wire is "spring wire" and where can I buy some?
May 26, 2004, 02:08 PM
Blade Springs "Rock"
I purchased mine at the local Big Boys Toys hobby shop, for $1.69, I'm sure you can get it a Towerhobbies as well or any other on line hobby shop, it was for the new adjustable links, the thought of using it for springs was secondary, but they give you like 5 pieces in a tube so there was plenty to experiment with. I believe is is just regular music wire. I also added some 1/16 shrink tubing for blade protection. I cannot tell you how nice it is, control is awesome, and that sweet sound of perfect blade tracking and absolutly no vibrations at all.....
Last edited by Geoffrey109; May 26, 2004 at 02:21 PM.
May 26, 2004, 02:52 PM
MeVs Gravity, Gravity won
Jarg's Avatar
going to get a aerohawk in 1 month or so, after lerning to fly i will have to mod this on (won't do it streight away as i want to see the difference)

May 26, 2004, 03:04 PM
Registered User
EddieNewYork's Avatar
Thanx, is there anyway you can take some clearer pics? Kinda hard to see some of the detail. Also, the diameter of the loop seems larger than the screw hole, is there a reason behind this? And just to make sure I understand what is actually happening. Tell me if this is right... those pieces you made are on the left side of the blade, so when the rotor starts to spin clockwise, the blades will want to then go left, and that's what these pieces will catch on. Is that correct?
May 26, 2004, 03:23 PM
Blade Springs "Rock"
I have found this to be the problem, that the springs corrected for: On spin-up the blades want to fall into a retreating blade stall condition. Some power inputs also cause the blades to fall behind as well, causing a wobble/vibration. The spring tension holds the blades about an inch forward of the cord, and keep the blades from going into retreating blade stall with power changes. I believe the blades are so light that centrifical force cannot make up for. The blades fly now with a slight spring tension that keeps them in perfect cord alignment. It has elimanated all vibrations and hover wobble. The blades are loose so the springs can act upon them.

I made the hole in the spring to fit inside the blade grip around the spacer that came with the Like90 blades. I wish I had a better camera too, but tonight I will try to capture some better pics. The first picture has the springs I made that fit into the blade grips.....

You most likely will not learn how to fly this helicopter without the springs, I know I've put the helicopter into the ground a couple dozen times prior to this mod, and now it will hover without hardly a stick input.
Last edited by Geoffrey109; May 26, 2004 at 03:28 PM.
May 26, 2004, 11:18 PM
Registered User

Good Job

I'll have to try it .All of my blades mount under the grip on my hummingbird.Should be easy enough to figure out.Thanks for the idea.

May 26, 2004, 11:42 PM
Blade Springs "Rock"
I hope this picture tells the story....see how the springs help keep the blades just forward of the cord, and in flight, see how they help with retreating blade stall, by not letting it happen........? the Springs keep the blades centered and balanced.....I did it, I found it, and It's perfect......
May 27, 2004, 12:07 AM
I see the future.
Yukonho's Avatar
This is a great execution of the spring idea. Way better than the elastic bands I have seen before. I still cant quite figure out how the other end of the spring is anchored though, cant wait for more pics.
If you could do a little how to, I bet a bunch of people would benefit from it.
I have long said that it is not the manufacturers that come up with the best ideas, it is the guys, like you, who use the products every day. Great work!
May 27, 2004, 01:56 PM
heli addict
humveeflyer's Avatar
hey Geoffrey109, any up-dates on the "how-to-do" on these springs?
May 27, 2004, 09:43 PM
Blade Springs "Rock"
Really there is not an anchor for just fits into the blade grip and does it's thing, the tension is just right, if you really look at the first pic, you can see the details of the design.......simple. The experiment worked the first time out.....and it' flies great......contol, vibration.....all are eliminated with it. A how just a matter of looking at the photos......and reading the can wrap a .o39 wire around a .250 1 and 1/2 times? that's it.......problem solved.....
May 27, 2004, 11:42 PM
Registered User

Oh well

Looks like I'll try it later.What luck my latest blades dont wobble.
Hey if they pass the training gear test I'm happy.
May 28, 2004, 12:12 AM
Registered User

Geoff the King

all resolved now..geoff and I are now good mates !
Last edited by OzzieFlyer; Jul 27, 2004 at 05:01 AM. Reason: resolved

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
New Product New Blade 200 S Fixed Pitch FBL Announced in September Model Aviation Magazine Bajora Micro Helis 54 Jul 01, 2017 12:58 PM
Sold Blade mSR X fix pitch helicopter Plane Addicted Aircraft - Electric - Helis (FS/W) 0 Nov 29, 2016 10:32 AM
Sold Blade mSR X fix pitch helicopter Plane Addicted Aircraft - Electric - Micro & Indoor Airplanes (FS/W) 0 Nov 29, 2016 10:28 AM
Sold Blade mSR X fix pitch helicopter Plane Addicted Aircraft - Electric - Micro & Indoor Airplanes (FS/W) 0 Oct 18, 2016 06:05 PM
For Sale Two Blade mSR X fix pitch helicopter Plane Addicted Aircraft - Electric - Helis (FS/W) 0 Apr 10, 2016 03:54 PM