EP Concept blade tracking question - RC Groups
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Sep 02, 2003, 02:01 PM
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EP Concept blade tracking question

I have an EP Concept with the older flapping head and I am trying to get the blades tracked. The problem... At neutral pitch they are tracking fine. When I move to either side of that the blades go out of track.

One blade travels higher and lower then the other (and therefore out of track).

Suggestions? Seems like it might be slop in the washout area?

I know EP Concepts have a reputation for tracking issues. Just want to know if anyone has had this problem and what they did to correct.

I am using foam blades as I thought foam blades were less prone to tracking problems.

Thanks, Joe
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Sep 02, 2003, 02:10 PM
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Hey Joe - the foam blades are near impossible to get tracking properly. Go for the GRP Kyosho or CF ModelSport blades and you will have a lot less trouble getting your setup nailed. The "Foamies" are better used as training gear, skids or wheel chocks for a 1/4 scale plank

Cheers- Boyd
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Sep 02, 2003, 02:28 PM
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Thanks for the advice. I have a few different blades I can try. I thought I had heard the foam blades tracked better.

I also know I have read that people have had tracking problems with the MS carbons.

I will try putting some woodies on.

Thanks, Joe
Sep 02, 2003, 04:06 PM
Registered User
At noon I put some wood blades on and tracking seems much better.

Will try flying this evening...

There seems to be a little hickup when moving through 0 pitch. Almost like the linkage goes from being pushed to being pulled (tension/compression?) and there is some play in the system that gets realized when that transition takes place. Anyone else notice this on theirs?

Thanks, Joe
Last edited by JoeR; Sep 02, 2003 at 04:33 PM.
Sep 03, 2003, 10:30 AM
Registered User

Re:EP Concept blade tracking question

Hello !

I am a Japanese EP concept flyer.
I have experienced a thing once like your question.

Has your volt of flapping head tighten strongly all?

Sep 04, 2003, 07:15 AM
Registered User
Hi Joe,
I've had alot of experience with both the flapping and see saw heads as used on the EP concept. The problem with the flapping hinge head is the lack of rigidity and connection of the two blades whereas the see saw head has a direct connection which definitely makes tracking an easier accomplished task. All is not lost however, If you statically track the main rotor making sure that the blades are at the same height at the tips at while at rest and use blades (wooden Kyoshos) with weighted tips the problem will disappear.
Sep 06, 2003, 11:45 PM
Registered User

need help with Voyager blades on the EP Concept

I have a couple pairs of JR Voyager blades, that I tried to use on my EP Concept. With my JRC semisymmetrical blades, the tracking is perfect at any rpm/ pitch. When I switch blades to the JR Voyager blades, I can not get the longer blades to track consistently. Is there anything inherently different about the chord wise balance of the JR Voyager blades vs the EP Concept blades ?
How about the effect of the longer blades ? Do I have to stiffen the damper "O" rings in order to utilize the longer blades ?

Any suggestions would be appreciated !
Sep 07, 2003, 03:40 PM
Registered User
EP can't help you with your issue. Are the Voyager blades weighted?

Mine seems to be doing fine on the wood blades.

Foam blades: On my foam blades there is a "kiss off" edge from the mold on the leading edge. Should I sand the leading edge to a nice rounded profile? I have heard of others having the best luck with these blades so I am interested in working through this.

Head Stiffener on the flapping head version? Has anyone tried fabricating a head stiffener (similar to what some of the mods for the FP Hornet and Pic? Maybe have a formed steel piece come over the top to tie both sides together. Just a thought.

Thanks, joe
Sep 07, 2003, 04:13 PM
Registered User

Yup, they're weighted

The JR Voyager blades I have, contain a metal weighting rod near the tips, near the leading edge. My JRC semi-symmetrical blades are similar to the JR Voyager blades, but they are a little shorter. I still can not figure out how to make the longer blades track.Its strange, in that I can have perfect tracking with the foamies, or the JRC wood blades, but then when the JR Voyager blades are swapped in, the tracking is terrible !

As for stiftening the flapping head, I used two flapping hinges, on my head, but before I could put it back on my heli, I purchased a seesaw head.
I merely used some longer 2mm bolts to add another hinge plate on the top side of the head assembly. I never tried it, but it might have been too stiff. I've seen pictures of others who have used two ball links to connect each side of the flapping hinge. It makes it easy to adjust the coning angle !