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HomeAircraftHelicopterGasser Model RC HelicoptersOther › FBL Predator Gasser Ready...
04-07-2010 01:02 AM  8 years agoPost 1
2tall

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Crystal Lake, Illinois, USA

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Just waiting for the weather to clear - Friday and the weekend look promising, and caught up on honey-dooooos. Film at 11.

"Pay attention...lest the ground rise up and smite thee."

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04-07-2010 02:19 AM  8 years agoPost 2
oldfart

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Vancouver, Canada

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Looks great.

I cannot see from the pictures how long the standoff on the ball joint that is on your blade grips.

You may find the ones with the longer standoffs (like the CNLR1017) will allow you to adjust the electronics for better resolution.

Phil

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04-07-2010 02:49 AM  8 years agoPost 3
Helizrule

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Lake Ariel, PA

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Wow that is really nice. Super job on the radio install.

One mile of road will take you one mile. One mile of runway will take you anywhere in the world.

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04-07-2010 03:09 AM  8 years agoPost 4
2tall

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Crystal Lake, Illinois, USA

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You may find the ones with the longer standoffs (like the CNLR1017) will allow you to adjust the electronics for better resolution.
I used the longest links supplied in the Predator kit. The balls are displaced from the grip pitch arms by a shaft about 3/16" long. Are the ones you recommended longer?

"Pay attention...lest the ground rise up and smite thee."

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04-07-2010 05:47 AM  8 years agoPost 5
rbort

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Franklin, MA - USA

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Looks really nice Jon!
Good luck on the maiden flight this coming weekend

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3280 flts
Whiplash V1-2 Hanson 300, 1555 flts
Whiplash V2 Hanson 300, 393 flts

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04-07-2010 05:20 PM  8 years agoPost 6
oldfart

rrProfessor

Vancouver, Canada

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The CNLR1017's are longer, but yours may well also work out OK. If you find the electronics difficult to get tuned "just right" you can always easily change them out for the longer CNLR1017's.

Be sure to also use rotor blades like the "01" FAI series of rotor blades that are neutral also. They will greatly alleviate a lot of the workload of the internal gyros in your FBL electronics. Stay away from the agressive type of 3D blades as they can critically overwork the electronic stabilization systems.

Phil

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04-07-2010 05:44 PM  8 years agoPost 7
2tall

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Crystal Lake, Illinois, USA

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Thanks for the great advice. I was thinking about getting a set of the Scott Gray 720mm FAI blades.

http://www.helidirect.com/rotortech...des-p-10278.hdx

Would they be suitable, or would a semi-symmetrical airfoil be better?

"Pay attention...lest the ground rise up and smite thee."

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04-07-2010 06:58 PM  8 years agoPost 8
Justin Stuart (RIP)

rrMaster

Plano, Texas

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Looks nice.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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04-07-2010 08:03 PM  8 years agoPost 9
oldfart

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Vancouver, Canada

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Those or the standard versions, the RT CN267201

http://www.ronlund.com/Merchant2/me...t_Code=CN267201

will also work as well.

Phil

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04-08-2010 12:32 AM  8 years agoPost 10
Helizrule

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Lake Ariel, PA

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Those Scott Gray 720 FAI blades are real real nice. I put them on the most recent Predator I built. They are super stable and beautifully finished.

One mile of road will take you one mile. One mile of runway will take you anywhere in the world.

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04-08-2010 01:02 AM  8 years agoPost 11
rbort

rrProfessor

Franklin, MA - USA

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Chris
Quit drooling

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3280 flts
Whiplash V1-2 Hanson 300, 1555 flts
Whiplash V2 Hanson 300, 393 flts

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04-08-2010 02:41 AM  8 years agoPost 12
Helizrule

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Lake Ariel, PA

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I know Raja, BUT BUT I need this

One mile of road will take you one mile. One mile of runway will take you anywhere in the world.

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04-08-2010 02:58 AM  8 years agoPost 13
lperagallo

rrApprentice

Westfield, Indiana, USA

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Be sure to also use rotor blades like the "01" FAI series of rotor blades that are neutral also. They will greatly alleviate a lot of the workload of the internal gyros in your FBL electronics. Stay away from the aggressive type of 3D blades as they can critically overwork the electronic stabilization systems.
Phil,

I've never heard of this. Can you help explain why you think that 3D blades can overwork the stabilization system?

Lou

Twin Bergen 44Magnums FBL Wren NW44s - Kero start

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04-08-2010 03:25 AM  8 years agoPost 14
2tall

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Crystal Lake, Illinois, USA

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Can the 720s be too long?

I'm not using the Align 700 3G head because it requires a 12mm shaft. The Century 10mm - 12mm adapter sleeve fits well on the 10mm shaft but way too loose inside the 12mm head. I'm having a better sleeve machined now. The Align head is preferred because it offers better adjustment geometry and control range for the pitch control links.

The Align 700 head blade mount bolts are 20mm further apart than those on the stock Century head. Therefore, with the Align head the rotor disk diameter is 20mm larger. I'm assuming that in some respects this makes my 710s the equivalent of 720s. So, 720s would become 730s. Also, the Align head sits 5mm lower on the main shaft than the Century head. Any issues here?

This is pretty much a stock Predator (Hanson 26) not the longer Condor.

"Pay attention...lest the ground rise up and smite thee."

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04-08-2010 03:48 AM  8 years agoPost 15
oldfart

rrProfessor

Vancouver, Canada

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Have you seen this Century FBL head?

http://www.centuryheli.com/products...tm?prtnm=CN2517

Phil

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04-08-2010 03:53 AM  8 years agoPost 16
oldfart

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Vancouver, Canada

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I've never heard of this. Can you help explain why you think that 3D blades can overwork the stabilization system
The best FBL or FAI blade is one that is designed to be dynamically neutral. A 3D blade is designed to be dynamically aggressive.

If a blade is dynamically neutral, it will never be trying to impart any sort of flight input or response rate or time of its own. It will only want to respond to inputs fed to it by the control system, be they inputs for stability in gusty winds, or from the translational forces in FFF or FBF or inputs to move somewhere (up or down or left or right or any combination) by inputs from the radio.

Therefore it will mean the electronic stabilization system will not have to also tune out unwanted characteristics of the blades before it has to then command the inputs to make the head do what it wants it to do.

Phil

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04-08-2010 03:57 AM  8 years agoPost 17
2tall

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Crystal Lake, Illinois, USA

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Have you seen this Century FBL head?
Thanks for the link. It looks much like the Align head. I wonder if the 30-50 size designation would be an issue for the Predator? The 12mm blade grip limit may be an issue - the Scott Gray 720s are 14mm at the root.

"Pay attention...lest the ground rise up and smite thee."

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04-08-2010 04:24 AM  8 years agoPost 18
2tall

rrVeteran

Crystal Lake, Illinois, USA

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Phil - I noticed that the link to the blades you recommended shows them as 3D rather than FAI. Mine are CY Radix 710s, but not the "SB" Stick Banger version.

http://www.helidirect.com/curtis-yo...ades-p-6413.hdx

Are they suitable? Is there a designation or buzz word that would help me sort out which 3D mains are less aggressive than others? Thanks for all you input.

Jon

"Pay attention...lest the ground rise up and smite thee."

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04-08-2010 11:36 AM  8 years agoPost 19
lperagallo

rrApprentice

Westfield, Indiana, USA

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Phil - I noticed that the link to the blades you recommended shows them as 3D rather than FAI. Mine are CY Radix 710s, but not the "SB" Stick Banger version.

http://www.helidirect.com/curtis-yo...ades-p-6413.hdx

Are they suitable? Is there a designation or buzz word that would help me sort out which 3D mains are less aggressive than others? Thanks for all you input.
Jon,

I run Radix stick bangers on my Gasser and Regular Radix blades on my turbine. There are no issues with the SKOOKUM units. That includes the SK360 and the SK720. Before I move over to any FAI blades I'd make sure that you are not planing any aggressive moves. FAI blades tend to be more flexible than a 3D blade and I wouldn't want a tail boom strike because of a flexible blade.

I respectfully disagree with Old Fart concerning blade type as I do not know of any FBL units that have any issues with 3D blades.

Lou

Twin Bergen 44Magnums FBL Wren NW44s - Kero start

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04-08-2010 11:41 AM  8 years agoPost 20
lperagallo

rrApprentice

Westfield, Indiana, USA

My Posts: All  Forum  Topic

The best FBL or FAI blade is one that is designed to be dynamically neutral. A 3D blade is designed to be dynamically aggressive.

If a blade is dynamically neutral, it will never be trying to impart any sort of flight input or response rate or time of its own. It will only want to respond to inputs fed to it by the control system, be they inputs for stability in gusty winds, or from the translational forces in FFF or FBF or inputs to move somewhere (up or down or left or right or any combination) by inputs from the radio.

Therefore it will mean the electronic stabilization system will not have to also tune out unwanted characteristics of the blades before it has to then command the inputs to make the head do what it wants it to do.
Phil,

With all due respect, can you explain how a blade adds input on it's own? How does the blade do that? If a blade had the capability to respond to wind, how would a flybarred system not have trouble reacting to that control.

Blade phasing may play a role, but that is a mechanical issue not a blade issue.

Lou

Twin Bergen 44Magnums FBL Wren NW44s - Kero start

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