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#1
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....Actually, the Grob already has the half functioning elevator, but that is to prevent spins not stop PIO!
I'm sorry!😉 I agree with your post but had to take the bait. |
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On Fri, 30 Sep 2016 02:30:40 -0700, dtarmichael wrote:
...Actually, the Grob already has the half functioning elevator, but that is to prevent spins not stop PIO! IME the elevator is reasonably functional on a G103 Twin 2 Acro but it could certainly use a better rudder. However it will spin: I did my annual spin checks one year in our one. -- martin@ | Martin Gregorie gregorie. | Essex, UK org | |
#3
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![]() IME the elevator is reasonably functional on a G103 Twin 2 Acro but it could certainly use a better rudder. Does it have the Z tape installed in front of the control surfaces as per the Grob/Lindner optional service letter SL-12? If not, you might find the effectiveness will be enhanced if you do install it. It works wonders for the Twin Astir rudder... It is certainly easy and cheap enough to try, and it is factory approved as well..... RO |
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On Fri, 30 Sep 2016 13:26:10 +0000, Michael Opitz wrote:
IME the elevator is reasonably functional on a G103 Twin 2 Acro but it could certainly use a better rudder. Does it have the Z tape installed in front of the control surfaces as per the Grob/Lindner optional service letter SL-12? If not, you might find the effectiveness will be enhanced if you do install it. It works wonders for the Twin Astir rudder... It is certainly easy and cheap enough to try, and it is factory approved as well..... I don't recall seeing any zigzag strip in front of the rudder hinge. I'll look next time I'm at the club and mention this where it may do some good if it is not turbulated. Thanks for the tip. -- martin@ | Martin Gregorie gregorie. | Essex, UK org | |
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At 23:25 30 September 2016, Martin Gregorie wrote:
On Fri, 30 Sep 2016 13:26:10 +0000, Michael Opitz wrote: IME the elevator is reasonably functional on a G103 Twin 2 Acro but it could certainly use a better rudder. Does it have the Z tape installed in front of the control surfaces as per the Grob/Lindner optional service letter SL-12? If not, you might find the effectiveness will be enhanced if you do install it. It works wonders for the Twin Astir rudder... It is certainly easy and cheap enough to try, and it is factory approved as well..... I don't recall seeing any zigzag strip in front of the rudder hinge. I'll look next time I'm at the club and mention this where it may do some good if it is not turbulated. Thanks for the tip. -- martin@ | Martin Gregorie gregorie. | Essex, UK org | Martin, You are welcome. If your Acro doesn't already have the Z tape installed, I would be interested to hear your opinion as to if the efficacy of the rudder is noticeably improved (or not) after the installation. If the fin airfoil profiles of the Twin Astir and the Acro are close, I suspect that you will notice a favorable improvement. Good luck... RO |
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On Sat, 01 Oct 2016 00:40:43 +0000, Michael Opitz wrote:
You are welcome. If your Acro doesn't already have the Z tape installed, I would be interested to hear your opinion as to if the efficacy of the rudder is noticeably improved (or not) after the installation. If the fin airfoil profiles of the Twin Astir and the Acro are close, I suspect that you will notice a favorable improvement. I finally checked our Acro II last Sunday: as I thought there's no fin turbulation on it, so I've passed your reference to the Lindner TN to the relevent club committee member. It turns out that our Acro now has a fairly low cockpit weight capacity. On Sunday we were using it for trial flights but we had to temporarily take one of our ASK-21s off scheduled training duties to fly a reasonably heavy trial flighter. Some of our members would like to use it for mutual XC flying since its a better XC glider than an ASK-21 and has a decent SDI flight computer fitted. That said, our ASK-21s do routinely go XC on good days with students who are close to soloing - an 80km o/r to HusBos is favourite with our paid instructors. -- martin@ | Martin Gregorie gregorie. | Essex, UK org | |
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At 22:46 10 October 2016, Martin Gregorie wrote:
On Sat, 01 Oct 2016 00:40:43 +0000, Michael Opitz wrote: You are welcome. If your Acro doesn't already have the Z tape installed, I would be interested to hear your opinion as to if the efficacy of the rudder is noticeably improved (or not) after the installation. If the fin airfoil profiles of the Twin Astir and the Acro are close, I suspect that you will notice a favorable improvement. I finally checked our Acro II last Sunday: as I thought there's no fin turbulation on it, so I've passed your reference to the Lindner TN to the relevent club committee member. It turns out that our Acro now has a fairly low cockpit weight capacity. On Sunday we were using it for trial flights but we had to temporarily take one of our ASK-21s off scheduled training duties to fly a reasonably heavy trial flighter. Some of our members would like to use it for mutual XC flying since its a better XC glider than an ASK-21 and has a decent SDI flight computer fitted. That said, our ASK-21s do routinely go XC on good days with students who are close to soloing - an 80km o/r to HusBos is favourite with our paid instructors. -- martin@ | Martin Gregorie gregorie. | Essex, UK org | Martin, Low seat load was the reason we sold our Acro several years ago. If you have a lot of 2 seaters, you can schedule around it, but the issue becomes a pain if you only have one or two 2-seaters to work with. If you can put up with the ground handling issues of a tail dragger, and a little bit stiffer flight controls, you may find (as we have) that the original Twin Astir gives a lot for the money invested. A lot of them had been used as advanced XC trainers, and not for basic training, so therefore minimal damage history.. This equates to a retention of the already very high factory seat load of 242 Lbs/seat plus another 22 Lbs in the baggage compartment. Some even have water ballast. For XC training, the Twin 1 has a markedly slower stall speed (with very effective trim) than the Twin II for better thermalling performance. Best L/D is also ~4 points better than the Twin II, so it is also noticeably better on the glides as well. For XC training, I would take the Twin Astir over an Acro any day....IMHO You can crash a Twin Astir, then add 40 Lbs of repair material and still have a higher seat load than a NDH (No Damage History) Twin II (let alone an Acro which will be 30-40 Lbs less than a regular Twin II). Of course, these numbers are for the rest of the world which doesn't have the RAF and BGA Twin II increased gross weight agreements with Grob..... RO |
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