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Gyro-Tec carbon Blades 100 Hrs Follow Up.

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  • #31
    Originally posted by Alan_Cheatham View Post
    Although both the Gyro-Tech and the ELA blades use the some airfoil we have found some reduced performance in certain areas with the GT blades compared to the ELA
    I'm really curious what areas do you mean? As for airfoils I'm not sure they are same for ELA and GT. GT states their rotors are vulgar 8H12 while modern ELA rotors likely use one of modern European-designed airfoil.

    Alex Lameko
    Russian gyroforum
    Visit my collection of gyro videos

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    • #32
      Originally posted by Alan_Cheatham View Post
      The reason for my question is that Gyro-Tech goes to the trouble to make a blade that has a recess in it's profile to compensate for the thickness of the leading edge tape, I want to know if tape applied to one of their standard blades will degrade it's performance. Although both the Gyro-Tech and the ELA blades use the some airfoil we have found some reduced performance in certain areas with the GT blades compared to the ELA and while we would like to install a leading edge tape a further performance hit would be undesirable.
      What reduced performance Alan? Takeoff distance and landing hang time?

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      • #33
        Good question Fara I also would like to know the reduced performance areas,I could possibly see a reduction in top speed buts

        that's about it.
        Best Regards,
        Eddie Sigman,Polvadera,nm
        (575) 835-4921

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        • #34
          It's been my intention to create a thread about our experiences mounting and flying the GT blades on the ELA we have here in Texas but I haven't gotten around to it yet.

          The information I have on the GT and ELA rotor is they both are using the 8H12 profile, refer to this document here on the ELA https://www.elaaviacion.com/wp-conte...djust-2015.pdf.

          GT has two options, the standard 8h12 or a modified one, we are flying the standard 8h12.

          In a nut shell lift, glide and maximum speed are degraded compared to the ELAs, takeoff distance is longer.

          Landing performance is more desirable, the ELAs will float more after the flare but then loose energy quickly and can drop you in, the GTs don't float and being a higher inertia blade hang in better for a smoother landing. Sticking a spot on the ground is more accurate with the GTs.

          The GTs are definitely smoother and the main reason for trying the rotor, we've never been able to get the ELA rotor vibration to a desirable level. The GTs are also more stable in turbulent air and at high speed flight compared to the ELAs.

          Handling qualities are better with a lighter stick despite the higher inertia (the GT rotor is about 14 lbs heavier than the ELA) but we found it necessary to install the GT rotor head to get rid of some undesirable rotor feedback and oscillation. The GT rotor has very little coning angle, they fly very flat and as such have about one inch less undersling compared to the ELA rotor, this caused issues flying them in the ELA rotor head so the ultimate solution was to install the GT rotor head which has shorter towers compared to the ELA.

          There were a few teething issues we encountered mounting the rotor, it turned out to be not quite the plug-and-play solution we where hoping for but I will say the dealer here in the US and the factory in Poland have been very helpful, Gyrotech seems genuinely interested in maturing their product given their support to us.

          Flight testing continues.

          Here's an earlier video we shot (in rather poor conditions) showing the GTs in action. https://www.youtube.com/watch?v=_0ydBw2BJgg
          Last edited by Alan_Cheatham; 07-24-2018, 10:45 PM.

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          • #35
            Great article Alan,and yes the blades are stiffer and fly really good in rough air and seem to be lighter on the cyclic.

            When David ordered our blades he sent them the spec's for the ring gear and they drilled those for us,they also later

            on made bushings to raise the ring back to its orgninal height,our install went actually very well.The factory has bent over

            backwards to help us. I believe the 8 1/2" blades are the standard 8H12 profile and the 8" blades have the modified profie

            One of the best design features to me is the teeter block with the bearings on the inside,instead of in the tower uprights.

            GREAT VIDEO !!!
            Last edited by eddie; 07-25-2018, 02:15 PM.
            Best Regards,
            Eddie Sigman,Polvadera,nm
            (575) 835-4921

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            • #36
              That teeter block and hub bar on GT is very much a La Averso Stella. I really have never understood the bearing in teeter tower design nor the AutoGyro design. Both seem less desirable to me.
              We noticed longer takeoff distance and less hang time on the GT compared to Averso.
              Last edited by fara; 07-25-2018, 04:56 PM.

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              • #37
                I think that teeter block design should be the standard for teeter blocks, its a good one.
                Best Regards,
                Eddie Sigman,Polvadera,nm
                (575) 835-4921

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                • #38
                  Not to derail the thread, but I recall reading a mention of a US distributor for GT blades. I've been in preparation for ordering a set through GT Poland direct, but that involves customs, etc. Is there a US distributor? And would there be any advantage to going through him/her instead of direct?

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                  • #39
                    I think that there is a distributor for the helio blades and it is in fla. check with GT in Poland that's a good idea.
                    Best Regards,
                    Eddie Sigman,Polvadera,nm
                    (575) 835-4921

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                    • #40
                      Around the first of this year we were in the process of ordering a set from the factory in Poland and just about to wire the funds when we became aware that the US distributor had a few sets in stock and so ordered from them.

                      Helicopter International LLC down in Florida.

                      Currently I find their web site is down but Facebook page is up, you might want to talk to them first.

                      https://www.facebook.com/pg/Helicopt...=page_internal

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                      • #41
                        Thanks guys. Found their number on cached google page and left msg. Would be nice to simplify transaction.

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                        • #42
                          Tapes do degrade performance 1\3% we have found even the nickle sacrificial strips on the helicopter blades if the trailing edge is not fared it makes a difference
                          3m make blade tape in different thicknesses it has a SHELF LIFE beware
                          https://www.3m.com/3M/en_US/company-...94857497&rt=r3
                          There is a Robinson tape that is supposed to withstand Rain etc. dont know anything about it who makes it ? rain will beat tapes to death
                          http://www.airwolfaerospace.com/awa/...on-helicopters
                          Last edited by yettie; 07-27-2018, 02:51 AM.

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                          • #43
                            Anything more this topic ?

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                            • #44
                              Brian Jackson has more info on "Gyro-Tech dealer and modified blades" its a post that he started.
                              Best Regards,
                              Eddie Sigman,Polvadera,nm
                              (575) 835-4921

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                              • #45
                                I have replaced my Gen1 blades om my MTO Sport with Gyrotech blades, hub bar and head. Done about 15 hrs on them. My experience to now is as follows. Heavier to handle on the ground. No difference in flight. Climbs a lot better. Landings are easier because they hold their energy longer. Takeoff roll seems a little longer when two up. Able to do same air speed. More stable in thermic and windy conditions.

                                Have some stick shake issues but I am confident we will sort them out. Changing rod end bearings on the control arms and then will start making adjustments.

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