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Old 07-04-2017, 10:13 PM   #26
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Some more


GEDC4187 (800x600).jpg   GEDC4224 (800x600).jpg   GEDC4184 (800x600).jpg   GEDC4220 (800x600).jpg  
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Old 07-06-2017, 03:01 PM   #27
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Looks like some of the ones they use to use on crop dusters. How big of a deal would it be to add the taller Turtle deck? Be a nice addition for some storage too.


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Old 07-06-2017, 10:25 PM   #28
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Won't happen. I need to STOP and fly. I was very unhappy with the result and was ready to rip it off and stay single place. Anyway I painted the trim and did the rear in white. Surprising difference between red and white. Red, it looked like hitting my thumb with a hammer. I'm actually happy with the result.

I'm planning on repainting all the sheet metal like the trim. It's PolyTone now. I think I'll add a small red strip to things white and the other way round.

Then it's done.

Had my grandson helping today.

Jack
GEDC4249 (800x600).jpg   GEDC4251 (800x600).jpg   GEDC4244 (800x600).jpg  
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Old 07-07-2017, 12:04 AM   #29
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lets see it open
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Old 07-07-2017, 03:27 AM   #30
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I was going to get some w/it open when we rolled it outside but it was raining. Will do.

I considered a new TD, have a factory glass TD but too much for me to bite off right now. Never know what I might do......
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Old 07-07-2017, 11:53 AM   #31
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There is a cut out in the rear fairing. It fits over the rubber bumper on lower front of V-stab.
GEDC4237.jpg   GEDC4251 (800x600).jpg  
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Old 07-08-2017, 09:49 PM   #32
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pictures open etc.
GEDC4253 (800x600).jpg   GEDC4255 (800x600).jpg   GEDC4256 (800x600).jpg   GEDC4258 (800x600).jpg   GEDC4260 (800x600).jpg  

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Old 07-09-2017, 02:02 AM   #33
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I like it. A factory TD would fix it up nicely. Can you jettison it?
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Old 07-09-2017, 03:27 AM   #34
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Yea, Glad I did not sell my factory TD. Jettison? Good question. No means to jettison.

First thought is "maybe" not necessary, "maybe" simply slide it back and go over the side like with a single place.

But I sincerely doubt it will be that simple. Indeed even exploring opening more than half way in flight could cause necessity to go over the side? Worse case you open all the way and you are both unable to close it again and airflow over the tail makes the airplane uncontrollable? Something I may not wish to explore.

I've only made a couple flights. I opened it about 18-20" @ cruise/125 mph and started to feel resistance to opening it more. I'll try it at slower speeds but will certainly hesitate to force anything. There is a trim change suggesting differing airflow over tail.

Jack

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Old 07-09-2017, 11:57 AM   #35
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Please don't become a test pilot on behalf of my question. ��
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Old 07-09-2017, 06:42 PM   #36
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Kendall,

Please don't worry cause I've thought about the issues already.

I'm starting at what am I using the airplane for. I've already decided against any serious aerobatics. If I did want to go that way I'd put the single place canopy on.

My reason for the two place canopy was to carry two people. Entry/exit is so much easier w/o the rear windshield. No aerobatics probably won't wear chutes.

That said. I do want to see what is going on. I'll trim for slow flight and try opening holding on with both hands taking special care if airflow might try to take over. If there is a trim change and I can't control the canopy and airplane I QUIT?

But say that I can easily open back/forth past half way...That's good. If so, try at a higher speed.

Anyway I understand the dangers which really are separate from the question.

Also thinking about method to jettison and nothing simple comes to mind.


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Old 07-10-2017, 01:43 AM   #37
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Flew it some more today. Let's say it is in general nice enough for two people to fly around but that's all.

Issues.

It has caused a significant nose down trim change. I ran out of trim in a 90 IAS climb.

My initial suggestion of being able to open "half way" was clearly an error overall. I can open it about 18" at 100 IAS and about 10" at 125 mph cruise. Both do make for good ventilation. Opening any further results in a VERY powerful nose down impulse, I simply can not go there!! It would be Very difficult to open farther. Indeed I'd be inclined to say forget egress w/o ability to jettison.

If I decide to keep the 2-place canopy I think it will require an adjustment of stab. incidence so that I have sufficient trim for normal speed ranges.

If I decide to keep it I may reconsider installing the standard FG TD. I suspect that might mitigate these trim issues.

Kendall said,

"I like it. A factory TD would fix it up nicely."

I like it too and I agree with the TD idea.


He also asked,

" Can you jettison it? "

Again, NO! And w/o that ability IMO FORGET aerobatics.

I plan on repeating all my climb/speed test to see it's effect on Vx, Vy and Stall.

I kept good records and will plan tests close to the same DA's

Jack
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Old 07-10-2017, 10:20 PM   #38
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Good work your doing.

I may have to plan for a ride down to see it when I start working on my install. I believe your on the right track


You've peaked my interest with the trim changes. I wonder why that may be happening.
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Old 07-11-2017, 12:02 AM   #39
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Trim change? Maybe 100 pieces of yarn on canopy, TD, stab./elevator and take picts. as canopy is opened/closed.

At the least mount a mirror on top of windshield so I can watch them.


I think the canopy(when closed) causes airflow/down force on stab. hence need for more nose-up trim? Opening canopy causes that flow to miss stab resulting in nose going down.....?
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Old 09-13-2017, 02:25 AM   #40
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as i contemplate building a canopy system for my acroduster, i wish someone with some aerodynamic understanding would comment on the issue you discovered.
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Old 09-13-2017, 05:17 AM   #41
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Kendall,

I don't know for sure since I gave up on it and didn't test it with yarn etc. My engine issues are a bigger issue for me.

That said I suspect it won't be an issue as long as the canopy is nicely faired into the TD. With correct height TD that should not be a problem IMO. Many AD2's have 2-place canopies.......

I have no idea why the early builder of my airplane made such an low TD?

Jack
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Old 09-13-2017, 08:40 PM   #42
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Your probably on to something there. the transition between your canopy and your TD is a sharp transition and probably caused turbulence that effected pitch.

On the other hand i remember the blue acroduster with yellow flames had a pitch issue as well - remember that? Wonder if that was ever sorted out.
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Old 09-13-2017, 09:11 PM   #43
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Yea I seem to remember that one. I think Dave just posted a picture of it on the other thread?

This one? Maybe we can find the thread? Maybe in classified?
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Old 09-14-2017, 01:07 AM   #44
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http://www.biplaneforum.com/showthre...r+pitch&page=2
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Old 09-14-2017, 02:59 AM   #45
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Seems Glen Olsons didn't have any issues? It's a great looking plane. Sold on here (wayyyyyy to cheap) a few months back. You might look at its canopy. It was a convertible also, could be open cockpit also I believe. Just a thought?
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Old 09-14-2017, 11:33 AM   #46
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Quote:
Originally Posted by Lotahp1 View Post
Seems Glen Olsons didn't have any issues? It's a great looking plane. Sold on here (wayyyyyy to cheap) a few months back. You might look at its canopy. It was a convertible also, could be open cockpit also I believe. Just a thought?
what is the N number on that ship. Picture?
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Old 09-14-2017, 12:35 PM   #47
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Quote:
Originally Posted by airplanegeek View Post


Kendall,

The thread just ended with nothing resolved? The canopy could be part of the problem. It does seem to be larger/taller than other 2-place canopies I've observed. I also wonder if the gap/distance between the canopy and the center section might result in a very different airflow over the tail? Like if too close may be a choke point causing high drag. I wonder is mine had an issue in that area. I would have thought that total drag would be less resulting in higher speed with the two place canopy vs. two open cockpits.

That was not the case on my AD2, the airplane was at least a couple mph slower and climb seemed to suffer? OTOH the same canopy on my tu-holer results in a cruise speed 5 mph faster at same power setting.

Look at the picts. of my canopy install. Because it was sliding I was forced to push the entire assembly forward as far as possible to be able to open it before hitting the tail. This made for very little gap between canopy and CS. With a swing over canopy you don't have to do that.


You are wise to ask these questions. The canopy install is a major effort and no fun if it doesn't work well.

Jack
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Old 09-14-2017, 10:52 PM   #48
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sigh - well, most likely i will never know. I cant do wind tunnel testing - sorta overkill. LOL

I will build it and hope for the best. I too will have a larger sized bubble on my airplane, because i really do want to try for at least a 6 foot tall pilot, even though i am only 5'3", i want to build it for whomever may eventually fly it.
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Old 09-15-2017, 03:38 AM   #49
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One other thing Kendall. Remember that I installed that canopy first on the Spezio. From the factory it was a full bubble sloping down at both ends. I cut the rear off to fit the Spezio.....

When starting with a fresh bubble you will have more options.

Indeed maybe so many to cause a headache?

Your reclined seat will also be much better too IMO.

Jack
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Old 09-18-2017, 12:36 AM   #50
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Quote:
Originally Posted by airplanegeek View Post
what is the N number on that ship. Picture?
34LG

Pm sent


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