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Home✈️Aircraft🚁HelicopterGasser Model RC HelicoptersOther › Source for 800mm main blades?
09-15-2009 09:54 PM  11 years ago
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glover1482

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Flying Field

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Source for 800mm main blades?
I'm looking for main blades for a Bergen Intrepid EB. All of the sources I've found do not have any stock on hand... any positive ideas?

Fly safe, Glover
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09-15-2009 10:54 PM  11 years ago
pgkevet

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Wales

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ron's heliproz is showing 810 rotortech's in stock
midland heli has 800mm nhp razors
pgk
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09-15-2009 11:53 PM  11 years ago
Outback Jack

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South Australia

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Source for 800mm main blades
Airstar International.
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09-16-2009 12:28 AM  11 years ago
glover1482

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Thanks for the suggestions.

Fly safe, Glover
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09-16-2009 12:43 AM  11 years ago
Wayne Parrish

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Apex,NC,USA

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Esat Coast Scale maybe
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09-16-2009 05:55 PM  11 years ago
imnxtc

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Seems to me that the Bergin EB uses blade grips that are relatively narrow - only 14mm. This used to be the standard blade roots size for the smaller blades (e.g. 600 to 700mm).

An 800mm blade would exert a lot more force on the blade roots then would a smaller 700mm blade. So many of the newer gasser helis (e.g. Predator Condor) that swing 800+ blades have blade grips to accomodate wider blade roots.

The Rotor Tech 800+ blades are great blades, but they use a more sturdy 16mm blade root so I do not think they would fit on the Bergin.
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09-17-2009 12:13 AM  11 years ago
glover1482

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You are correct about the grips being 14mm.

The NHP blades that sacrificed themselves in a forced autorotation are the only ones that I know will fit. Bergen tells me that they are at least 30 days from having more NHP blades.

I need to locate a reliable source, and purchase more than one pair. (Well maybe not, as only one of the blades had a small crack resulting from my clunk line failure... if I only break one blade at a time.) I was just getting happy with the EB, and am now back to polluting the air with my Raptors and planks.

Fly safe, Glover
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09-17-2009 12:28 AM  11 years ago
payne1967

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uk

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the bbt evolution 795 blades are the correct root size for you
i've just measured mine off my hirobo bell 47 g2
and they are about 14mm root size
and i got them from midland helicopters in the uk
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09-17-2009 01:53 AM  11 years ago
darksidedave

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niles,MI

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What about Rotortech H-8375C ?
They are 830s with 14mm grip for industrial class..
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09-17-2009 02:58 AM  11 years ago
glover1482

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Well Dave, I really want semmetrical blades, but thanks for helping.

I keep running into "out of stock" notices. I just need to be more patient, and keep looking. I do have other toys to play with... it's just that I want to play with my new EB.

Fly safe, Glover
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09-17-2009 08:17 AM  11 years ago
carpman

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Spain

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Have you tried the main distributor in the UK, I know it means shipping them but if they have stock and your buying a few pairs could be worth it?

http://nhpworldwide.org/acatalog/To...BLADES_165.html
KEVIN
Trex 500ESP | Trex 600NSP | Trex 700 Gasser | MA Spectra G
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09-17-2009 02:27 PM  11 years ago
Chris Bergen

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cassopolis, MI USA

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Seems to me that the Bergin EB uses blade grips that are relatively narrow - only 14mm. This used to be the standard blade roots size for the smaller blades (e.g. 600 to 700mm).

An 800mm blade would exert a lot more force on the blade roots then would a smaller 700mm blade. So many of the newer gasser helis (e.g. Predator Condor) that swing 800+ blades have blade grips to accomodate wider blade roots.

The Rotor Tech 800+ blades are great blades, but they use a more sturdy 16mm blade root so I do not think they would fit on the Bergin.
Unfortunately you are incorrect in ALL your assumptions...

We use the SAME blade grip root size spinning even 950mm hi-lift blades on a 50 Lb machine!! I doubt that any 810's are going to be overstressed...even in hi stress flight like an 18 lb Intrepid Turbine doing tic tocs....

Yes, the rotortech 810's have a 16mm root, but funnily enough, the 830mm blades have a 14mm root!! Bigger blade, narrower root...hmmm.
Chris D. Bergen
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09-17-2009 03:40 PM  11 years ago
glover1482

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I've found some SAB blades at Quick, and ordered them. (I still have my order for some NHP blades is place at Bergen, so those will be my backup blades.)

Thanks to all for your assistance!

Fly safe, Glover
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09-18-2009 11:24 PM  11 years ago
modifyit15

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Spartanburg, SC

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airfoil also has the 800mm NHP'sFly 60% take heli home Fly 150% take parts home
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09-19-2009 12:40 AM  11 years ago
imnxtc

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BC.Canada

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Chris,

You are correct if one is only considering a relatively lower head speed.

Force on rotor blade grips and the roots of the rotor blades depend on two things - size (weight) and rotor speeds. Note that the force increase from a higher rotor speed is much greater per % increase then is the same % increase in weight.

So an 800mm blade turning up at 3D type rotor speeds, as used in the 3D type of flight some of us have been fortunate enough to see some people perform with their big Condors swinging these 800mm RT's, will excert a LOT more force here, then will a camera ship turning 835mm blades at a substantially lower rotor speed.

I understand that the 800's were designed more for higher rotor speeds required for aerobatic type cyclic response on these large helis, while the 835's are for lower head speeds as seen in industrial applications and similar "soft" type of flying.

As a number of these larger helis (like your EB) are used at the lower head speeds, these 835's would be compatable with more of these helis, so they were designed for them while they would also be compatible with a Condor (using spacers) that would also be set-up for lower head speeds and softer flying.
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05-08-2010 11:44 PM  10 years ago
Heliguychris

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Perth, West Australia

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So..... whats the best 800mm 14mm root 3D blade, for stretching a T700?Licensed (CASA) UAV operator certificate holder 1-YFOF5-01 www.helicamaerial.com.au
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06-20-2010 06:12 AM  10 years ago
aussieheliguy

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Australia

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Hey HeliguyChris
Did you ever get an answer to the question about those blades for strecthing the 700.
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