Flying wing scratch

[MeePokMan]

Joe, your Zagi is really very chio!

Flying is good ah? OK, will start to build one tonight.

I downloaded the MH60 airfoil, but I don't have the plotting software to make the ribs. So I guess I will aga-aga the airfoil based on the picture files I downloaded. Joe, what do you think?

Hey, Viper, not inspired to make another one?

[joe yap]

Joe, your Zagi is really very chio!

Flying is good ah? OK, will start to build one tonight.

I downloaded the MH60 airfoil, but I don't have the plotting software to make the ribs. So I guess I will aga-aga the airfoil based on the picture files I downloaded. Joe, what do you think?

Hey, Viper, not inspired to make another one?

Kah Lup,

You can use the Profili freeware to plot the individual rib profile. After getting them printed out, you can manually plot the spar, LE and TE position. In the worst case, a little 'Agaration' will not hurt either. People are already flying depron wings with flatplate airfoil. How bad can this be?

Only if you pay for the full version, the program will do these detailings for you.

You are right about the flying. It is no surprise at all. Very easy to fly even with 16oz AUW. I can even cruise around at about 1/2 throttle for my setup. Easily the smoothest powered flying wing I ever flown. Best of all, this wing does not tip stall. Yank as much up elevator as you want, and the nose just drops and pitches up again until you let go of the stick. If this is the CSP Jazz Xtreme, you'll can be certain that it'll fall out of the sky.

[Ghostfit]

...Huh ! ...the MeePokMan is Lee Kah Lup ?



Learn something new everyday !



PS: How are you Kah Lup ? ...remember me ?

[MeePokMan]

...Huh ! ...the MeePokMan is Lee Kah Lup ?



Learn something new everyday !



PS: How are you Kah Lup ? ...remember me ?

How can I forget you Tony? You and your super-bikes with modified exhaust!

I am good. Still working from London, running around Europe. Flying RC.

And yes, learning something new every day!

[joe yap]

How can I forget you Tony? You and your super-bikes with modified exhaust!

I am good. Still working from London, running around Europe. Flying RC.

And yes, learning something new every day!

Selling mee pok?

[Babylon5]

Hi, very inspiring and interesting thread on DIY flying wing.
Am also interested in the flying wing.
I got this 100 grams outrunner motor that can swing a 8-6 prop at around 30 over amps and delivered some good thrust ,sitting and collecting dust. I would like to use this motor on a flying wing of around 400-450 sq in , wing span around 1-1.2m and weights below 1 kg.

Where can I get the plans?

Thanks.
B5

[randomtask]

Hi Joe,

I was wondering how do you apply the tyre-patterned covering on the bottom. Do you cut out the shape first or do it once the covering is applied on the bottom. Thanks.

Cheers,
Adnan

[joe yap]

Hi Joe,

I was wondering how do you apply the tyre-patterned covering on the bottom. Do you cut out the shape first or do it once the covering is applied on the bottom. Thanks.

Cheers,
Adnan

Hi Adnan,

I covered the entire bottom with silver first. Then I used CAD to draw the tyre thread patterns and printed it out on an A4 size paper. I just taped the A4 paper with the patterns on a piece of black Monokote and manually cut out cut pieces of the pattern with a penknife.

To apply the patterns cut early on the wing, I started off by placing the pattern on one side and tacked it down with an iron at low heat. Once it is in place, I used it as the reference and tacked each individual pieces until all the pieces are in place, before turning up the iron temperature and pressed them down again.

Not that difficult, but need smoe patience. But I personally think that the easiest way is simply put it under your car and drive over it. Just joking.

Anyway, I had another idea before I did this. I thought of putting a sheet of Monokote or Oracover under my car wheel, apply some black paint and drive over it. However, the trick is to avoid the hot iron from contacting the paint when applying it over the wings. Another idea is to apply some paint over a spare tyre and manually roll it over the covered wings. Whatever it is, I think you can come up with a lot more.

[viper1990]

Hey, Viper, not inspired to make another one?

Of course i'm inspired to make another one! haha.

Except it'll be a foamy. Won't be cp or balsa.

Reason:

Foamies , build, crash, repair
Balsa , build, crash, wallet gets lighter suddenly(for me). haha!

Anyways, i must say dazi is really easy to fly and newbie-proof. I had once flying my wing pretty high up when suddenly i lost total control of the plane for whatever reason, my dazi just glide backdown and land as if its on autopilot, and to everyone that saw it they went "WOW"

Lastly, i did some research on airfoils, like the MH-60 range airfoils and came out with some specs.

MH60
Thickness: 10.12%
Comparatively high maximum lift coefficient.
Low moment coefficient of cm c/4 = +0.0140.
Can be used at Reynoldsnumbers of 150'000 and above.
Has been used successfully in F3B tailless model airplanes.
Similar to the MH 45, which might be better suited for Reynoldsnumbers below 150'000.

MH61
Thickness: 10.28%
Comparatively high maximum lift coefficient.
Low moment coefficient of cm c/4 = +0.0175.
Can be used at Reynoldsnumbers of 150'000 and above.
Has been used successfully in F3B tailless model airplanes

MH62
Thickness: 9.30%
Comparatively high maximum lift coefficient.
Low moment coefficient of cm c/4 = -0.0004.
Can be used at Reynoldsnumbers of 150'000 and above.
Has been used successfully in F3B tailless model airplanes.

Ok heres my question.

1)why MH60 out of so many avalible airfoils? Or do you just agar agar pick one and go with it?

2)and other question about "Can be used at Reynoldsnumbers of 150'000 and above." So what if i use under 150'000, the airfoil becomes less efficient?

[joe yap]

Of course i'm inspired to make another one! haha.

Except it'll be a foamy. Won't be cp or balsa.

Reason:

Foamies , build, crash, repair
Balsa , build, crash, wallet gets lighter suddenly(for me). haha!

Anyways, i must say dazi is really easy to fly and newbie-proof. I had once flying my wing pretty high up when suddenly i lost total control of the plane for whatever reason, my dazi just glide backdown and land as if its on autopilot, and to everyone that saw it they went "WOW"

Lastly, i did some research on airfoils, like the MH-60 range airfoils and came out with some specs.

MH60
Thickness: 10.12%
Comparatively high maximum lift coefficient.
Low moment coefficient of cm c/4 = +0.0140.
Can be used at Reynoldsnumbers of 150'000 and above.
Has been used successfully in F3B tailless model airplanes.
Similar to the MH 45, which might be better suited for Reynoldsnumbers below 150'000.

MH61
Thickness: 10.28%
Comparatively high maximum lift coefficient.
Low moment coefficient of cm c/4 = +0.0175.
Can be used at Reynoldsnumbers of 150'000 and above.
Has been used successfully in F3B tailless model airplanes

MH62
Thickness: 9.30%
Comparatively high maximum lift coefficient.
Low moment coefficient of cm c/4 = -0.0004.
Can be used at Reynoldsnumbers of 150'000 and above.
Has been used successfully in F3B tailless model airplanes.

Ok heres my question.

1)why MH60 out of so many avalible airfoils? Or do you just agar agar pick one and go with it?

2)and other question about "Can be used at Reynoldsnumbers of 150'000 and above." So what if i use under 150'000, the airfoil becomes less efficient?

I just pick an airfoil which is very much proven for a flying wing, which is not too thick to avoid laminar seperations, and yet still can accomodate the equipment within its thickness. RE 150000 is already pretty low and powered model like this can easily fly beyond this figure. If you fly too slow below tihs reynold's number, the airflow above the airfoil will not follow the curvature anymore and laminar seperation will occur. If the airflow re-attach itself just ahead of the TE, a lamination bubble will form and it will increase and drag. If it never re-attach, the wing is stalled, even at low angle of attack.

However, the elevons of the Zagi is a flat sheet and they are more like an extension beyond the original airfoil itself, thus a practical increase in chord. This helps to increase the reynold's number practically and allows you to fly at lower speeds.

[Ghostfit]

How can I forget you Tony? You and your super-bikes with modified exhaust!

I am good. Still working from London, running around Europe. Flying RC.

And yes, learning something new every day!

...Ah you remind me of the good ole days ! ...remember 1/2A paw 09 team racing ? ...you and MSC, Simon Khoong and Fabian and me and Michael.

Opps ! OT aredi

Back to the flying wing, I wonder if Raven finished his CF moulded Zagi ? ...Raven, you there ?

[MeePokMan]

Haha! Good old PAW 0.49 diesel engine...really missed that smell now!

But I like electric motor now - so clean and efficient. No more cleaning up after flying, no fuel tanks to make etc..

Back to the flying wing - I've made the wing ribs using Adobe Photoshop to help me scale the MH60 airfoil and print them out, glued to the 1/8 balsa and cut out the shape. Will glue them on tonight.

Hope to finish by next weekend.

[joe yap]

Haha! Good old PAW 0.49 diesel engine...really missed that smell now!

But I like electric motor now - so clean and efficient. No more cleaning up after flying, no fuel tanks to make etc..

Back to the flying wing - I've made the wing ribs using Adobe Photoshop to help me scale the MH60 airfoil and print them out, glued to the 1/8 balsa and cut out the shape. Will glue them on tonight.

Hope to finish by next weekend.

You probably mean PAW 149 which is .09 cuin and 1.49cc. I still have one along with the 249. Think you miss the ether too much.

[MeePokMan]

Haha...you're right! I am still holding on to those diesel vintage stuffs.

Ether! Ahhhh......can you still buy them now? Or are they too dangerous?

I still have a bottle of Amyl Nitrate - not opened. I remembered it cost us S$50 then! It's like Viagra to engine! Such increase in performance! Steam koyok!

[MeePokMan]

OK, I've done the ribs. They are as close to the MH60 as I could possibly made them. Glued the LE and TE to the ribs.

Putting the 4800Kv motor besides it, the 36" wing span looks small. I guess after making 2m gliders, this is a very small wing!