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Dec 02, 2018, 12:35 AM
looking up, down under
scruffy1's Avatar
i'm merely suggesting externally linked images might still work okay, seeing that youtube links are posting here okay

and it appears they do
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Dec 02, 2018, 07:27 AM
I Look, Listen, and Learn
Timbo383's Avatar
Ok, thanks Scruffy. I did go back and shrink the images to half of the size I usually post and they did work this time....maybe rc groups changed their mb allowance on pics. Or as the usual case, I don't know what I'm doing.
Dec 02, 2018, 09:43 AM
Quad and foam adept
Hermani's Avatar
Quote:
Originally Posted by scruffy1
i'm merely suggesting externally linked images might still work okay, seeing that youtube links are posting here okay

and it appears they do
BTW you're posting a nice picture of the Wright flyer. I was wondering about that airfoil. I searched online and found this page from NASA: https://wright.nasa.gov/airplane/lift1.html.

However having thrown the aircraft together in a bicycle workshop and being the first to actually fly I doubt that they really knew much about airfoil design and just tried what they thought might work and gave it a shot.
Last edited by Hermani; Dec 02, 2018 at 09:49 AM.
Dec 02, 2018, 10:35 AM
Registered User
Dickeroo's Avatar
Quote:
Originally Posted by Hermani
BTW you're posting a nice picture of the Wright flyer. I was wondering about that airfoil. I searched online and found this page from NASA: https://wright.nasa.gov/airplane/lift1.html.

However having thrown the aircraft together in a bicycle workshop and being the first to actually fly I doubt that they really knew much about airfoil design and just tried what they thought might work and gave it a shot.
Hermani.....

You might find this Wright Brothers video interesting....

Documentary: The Wright Brothers' Story (9 min 41 sec)
Dec 02, 2018, 02:00 PM
Build straight - Fly twisty
Whiskers's Avatar
Quote:
Originally Posted by Hermani
BTW you're posting a nice picture of the Wright flyer. I was wondering about that airfoil. I searched online and found this page from NASA: https://wright.nasa.gov/airplane/lift1.html.

However having thrown the aircraft together in a bicycle workshop and being the first to actually fly I doubt that they really knew much about airfoil design and just tried what they thought might work and gave it a shot.
You are a long way from the truth here.
I fact they started out by reading what all the so called experts in the world were doing and found that every one of them was wrong and they had to start from scratch,
They built a wind tunnel and conducted extensive experiments and refined their airfoil section to a high degree.
Such was their brilliance that when it came to designing their propellers they were able to use their own data and design propellers that were so efficient that their plane flew on 8 hp.
Do not entertain any idea that they were tinkerers who got lucky. They were brilliant, although somewhat flawed, men.
Dec 02, 2018, 11:49 PM
Registered User
davereap's Avatar
[QUOTE=Thomas B.;40568725]Here is my combat bird for 2019: an aggressive green woodpecker. I chose this bird because of the low aspect ratio and the forward swept wing.
It flies very well. Great tracking, Very agile. Capable of extremely tight turns. KFm 2 airfoil.


another good looker that flies well.... I love the wood pecker colouring
Dec 03, 2018, 12:39 AM
Quad and foam adept
Hermani's Avatar
Quote:
Originally Posted by Whiskers
Do not entertain any idea that they were tinkerers who got lucky. They were brilliant, although somewhat flawed, men.
Thanks for the insight, Whiskers. I did not mean to discredit their accomplishment, although I didn't know about their windtunnel experiments.
Latest blog entry: WoodQuad
Dec 25, 2018, 05:21 PM
scratchbuilder
Thomas B.'s Avatar

Temco Pinto


I finished the plan of my father's Pinto design. Very easy to build and relaxing to fly !
It will be a free Modell-Aviator downloadplan in spring. Anyone interested in test building and flying it before send me a PM.
Temco Pinto Tuning Version (2 min 19 sec)
Dec 25, 2018, 10:54 PM
skumgummi dave
Thomas B.

Das ist prima!
Dec 27, 2018, 10:41 AM
What could possibly go wrong?
nickchud's Avatar
Quote:
Originally Posted by Whiskers
You are a long way from the truth here.
I fact they started out by reading what all the so called experts in the world were doing and found that every one of them was wrong and they had to start from scratch,
They built a wind tunnel and conducted extensive experiments and refined their airfoil section to a high degree.
Such was their brilliance that when it came to designing their propellers they were able to use their own data and design propellers that were so efficient that their plane flew on 8 hp.
Do not entertain any idea that they were tinkerers who got lucky. They were brilliant, although somewhat flawed, men.
Quite right, and they built their own engine too. All available engines had cast iron blocks, so they made one out of cast aluminium. But, 'tinkering' i n the sense that they had no backing from the military or business. They had a pretty good network of contacts who were building gliders, making trial and errors, getting themselves killed, even back in the 1850s. David McCullouch's book on them is fascinating.

There was another tinkerer who did a pretty good job at the same time. Richard Pearse was a farmer in an isolated part of New Zealand who also built his own engine and flew about 100yds into a tree before the Wright brothers flight.

The Fiddlers Green website hs a lot of info about Pearse. You can order plans for a successful balsa model of his plane from Ivan Pettigrew
Last edited by nickchud; Dec 27, 2018 at 10:58 AM.
Dec 27, 2018, 10:44 PM
My cat moderates better
BillzillaAus's Avatar
Quote:
Originally Posted by nickchud
There was another tinkerer who did a pretty good job at the same time. Richard Pearse was a farmer in an isolated part of New Zealand who also built his own engine and flew about 100yds into a tree before the Wright brothers flight.
FWIW he did at least three flights before the Wright Brothers. The most impressive one was about 900 metres, some of it out of ground effect as well.v That was on the 11th of March, 1903.
Dec 28, 2018, 12:01 AM
Build straight - Fly twisty
Whiskers's Avatar
Quote:
Originally Posted by BillzillaAus
FWIW he did at least three flights before the Wright Brothers. The most impressive one was about 900 metres, some of it out of ground effect as well.v That was on the 11th of March, 1903.
He himself did not make such claims.
See: https://en.wikipedia.org/wiki/Richard_Pearse
Also note how 'claptrap' his aircraft was compared to the Wright's machine.
Dec 29, 2018, 10:00 PM
Registered User

airfoils


I have a large lazy bee, this winter I built a original size lazy bee with the kf airfoil, later I will cut another wing from foam and test the differences, the ones I.ve made are from foam. the original with the stick and tissue buils would be lighter, but foam is quicker
Jan 12, 2019, 02:04 PM
Registered User
I.ve built the original size bee and have finally got it tweaked out, with the set up right it flies as well as the original stick and tissue but is heavier, now to make a foam wing with the airfoil on it to compare the flight of the two and the weight
Jan 13, 2019, 03:30 PM
scratchbuilder
Thomas B.'s Avatar
Happy New Year.
Here is my first 2019 KFm 4 project. It is the biplane version of my Trottel design, Inspired by the Avicraft Panic:
The Trotteldecker. 60cm, 280g.
Trotteldecker Testflights (3 min 39 sec)


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