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Flaps with aluminium's pieces

Old 07-19-2020, 08:36 AM
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stearman70
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Default Flaps with aluminium's pieces

Hello. I am here again. I 'll start construction a parasol plane. I haven´t understood which it is aluminium pieces´s positionat the flaps. I don´t find where I´ll put 8 aluminium tabs. I saw the other pieces that are epoxy gluing to wing. I send you a blueprint. Thanks in advance. I can´t upload blueprint. I send you the link. pharaoh-rcm-04-94-1166 aerofred - aerofred

Last edited by stearman70; 07-19-2020 at 08:38 AM. Reason: Gramatic
Old 07-19-2020, 08:48 AM
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speedracerntrixie
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Are you talking about the slats that are at the wing leading edge? If so those are supposed to increase lift and lower the stall speed. Depending on where they are placed on the wing they can also be used to force the center of the wing to stall before the outer sections. Personally I would build the airplane without them and twist in some washout ( 1/4" leading edge down ) into the wing while covering provided you are going to use iron on plastic film covering.
Old 07-19-2020, 08:54 AM
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Originally Posted by speedracerntrixie View Post
Are you talking about the slats that are at the wing leading edge? If so those are supposed to increase lift and lower the stall speed. Depending on where they are placed on the wing they can also be used to force the center of the wing to stall before the outer sections. Personally I would build the airplane without them and twist in some washout ( 1/4" leading edge down ) into the wing while covering provided you are going to use iron on plastic film covering.
I am talking about flaps. They have aluminium´s pieces. If you see the blueprint, you will see a inscription says " make 8 pieces, but I don´t see where I'll put them.
Old 07-19-2020, 09:14 AM
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Unfortunately the link you provided only shows the fuselage plan. The only thing I see on the wing on that plan that is aluminum is the leading edge slats. Are you saying there are aluminum flaps at the wing trailing edge too? Can you post a link to picture of the wing plan?
Old 07-19-2020, 09:24 AM
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If you see the page to the bottom of where the fuselage comes from, it says "download plan", click there and it will also open the wings part.
Old 07-19-2020, 10:42 AM
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I would need to create a log in to download. Not really interested in doing that. I would love to help but at some point you need to help me help you.
Old 07-19-2020, 10:59 AM
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I have some wrong in my PC, I can´t upload the info. I'll treat fix that and I´ll send the all blueprint.Thanks for your help.
Old 07-20-2020, 08:58 AM
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Those 8 tabs are to make the hinges for the flaps. Two tabs are joined with a steel pivot pin to make one hinge. So 8 tabs will give you 4 hinges; 2 hinges per flap. These appear to be a Fowler flap or slotted Fowler flap. The 2 tabs will allow the flap to move back as it moves down.

I’ve marked the wing plan where those hinges are installed. Buenos Días



Old 07-20-2020, 02:11 PM
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Originally Posted by ETpilot View Post
Those 8 tabs are to make the hinges for the flaps. Two tabs are joined with a steel pivot pin to make one hinge. So 8 tabs will give you 4 hinges; 2 hinges per flap. These appear to be a Fowler flap or slotted Fowler flap. The 2 tabs will allow the flap to move back as it moves down.

I’ve marked the wing plan where those hinges are installed. Buenos Días


Hello. I've seen exactly where the aluminum pieces are going. My concern is as follows: the flaps are only supported by these pieces at their ends. I think if they won't be too fragile held just by the pushrod in the middle part
Old 07-20-2020, 04:39 PM
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That is just how it is designed. Two hinge points and the pushrod. As the flaps are extended they move back and down. This opens a slot between the wing and the flap. Air flows from under the wing and over the flap. Gives you better slow speed, more stable airflow over the flap and adds a little wing area.

The plan shows an optional cover plate to eliminate the slot.

By my calculation the distance between the hinge points is 9.5 inches. I would move the bellcrank outboard one rib bay. This puts the pushrod more centered on the flap. You will need a snug fit in the pushrod system.

You may also consider adding a third hinge point. Just a thought.

Last edited by ETpilot; 07-21-2020 at 03:02 AM. Reason: Spelling
Old 07-20-2020, 06:54 PM
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I am thinking in add other hinge, just in line with pushrod. I´ll make 12 aluminium tabs.
Covering the groove is more aesthetic or functional ?

Last edited by stearman70; 07-20-2020 at 07:01 PM. Reason: To add a question.
Old 07-21-2020, 03:01 AM
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These flaps are designed to have some airflow over the top. Adding the cover plate would be more for aesthetics. Still even with the cover plate you may still get some airflow. You can test it for a 30-40* flap extension.




Old 07-21-2020, 07:12 AM
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I´ll began to built up this beatiful bird. I´ll send you info about it. Thanks for your help.
Old 07-21-2020, 08:11 AM
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Good. Post some pictures as you build, if you can. I like scratch built stick building.

Good luck with your build.





Old 07-21-2020, 03:20 PM
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My last two scratch models. Ugly modified (8 changes ) and devastator (aerofred plane) .

Last edited by stearman70; 07-21-2020 at 03:23 PM. Reason: Send pictures.
Old 07-22-2020, 05:22 AM
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Good looking airplanes. Scratch building adds a lot to the pleasure of building.
Old 07-22-2020, 11:08 AM
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Beautiful planes. Its construction is very clean. Congratulations.The images show the first step in the construction of the pharaoh: The master rib and all the ribs in 1/8 and 3/32 balsa .sheets.

Last edited by stearman70; 07-22-2020 at 11:12 AM. Reason: Add pictures.
Old 07-22-2020, 04:38 PM
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Always a good feeling when you start a new build. But, lots more work to do, LOL.

I was looking through my photos for another forum and I found this one. It is my low wing that I previously posted. Just about the same pose but more advanced in the build. LOL.




Old 07-22-2020, 04:52 PM
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What a good finish! Are you using Chinese film or top flite monokote ? They look excellently lined. Congratulations on your very professional work. Your workshop looks very spacious and very complete. This allows you to work better. What is it his wing span ? 75" ?. For glow .61 or .90 ?

Last edited by stearman70; 07-22-2020 at 04:55 PM. Reason: Add comment.
Old 07-23-2020, 02:24 AM
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Thanks. The finish is Chinese film. Neucover sold by Value Hobby. Not a lot of variety in colors but enough for my builds. The shop is large but very cluttered right now. I’m trying to reduce the clutter. This pandemic is not helping.

You are good at estimating size. It is 76” WS 72” length. I built it around an OS GGT15. I haven’t run the engine yet. If it doesn’t work out an OS 75AX will fit the mounting holes. I still have to make a canopy. Clear or fiberglass. Leaning toward fiberglass but i have to order some fiberglass.

Since I got back into the hobby I’ve carried scratch building to the extreme. I draw my own lines for the build. It is just part of the challenge for me. Here is the finished airplane so far. A sample of my home drawn plans. The wing for this airplane.

Your Pharaoh is an interesting build. Looking forward to see it progress.





Old 07-23-2020, 05:21 AM
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It is beatiful. Very professional the finished. Did you make the letters ? I´ll send you info about the advance in the Pharao´s construction.
Old 07-23-2020, 08:35 AM
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Thanks again. I cut the letters from the covering film. It wasn’t an easy thing to do. First I had to determine letter size. I then made templates for the letters. I think I used a reverse template. I cut the top half and the bottom half with an overlap extension. I joined the 2 halves together then placed the individual letters on the airplane. It was time consuming and I messed up a few letters in the process. I had to make a couple of new letters.

I’ll be following your build. I’ve studied your Pharaoh plans a bit.
Old 07-25-2020, 01:14 PM
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Hello.


The letters are very professional. All my planes have vinyl letters and images, but I don't make them. I send you the next pictures about pharaoh's construction.
Old 07-26-2020, 03:04 AM
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You’ve made good progress. Looking good. Nice fuselage jig. I’ve thought about making one but haven’t yet. I did make a wing jig. Wing jig is good for tapered wings. You have a nice clean and organized workshop. It puts mine to shame. But I’m cleaning up slowly. LOL

Old 07-26-2020, 06:20 AM
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Thanks, It is not big and very clean but works. Did you read the Pharaoh's article ? There is a indication that says " Put 1/16 balsa sheet to cover fuselage's bottom, forward and rear."
I see that for cover bottom forward, I need 1/8 balsa or hard balsa and in the rear part, I don't see balsa cover. What do you thing about it ?

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