BJCraft Episode
11-15-2011, 07:03 AM
#26
Member
Join Date: Jun 2005
Location: West Jordan,
UT
Posts: 52
Likes: 0
Received 0 Likes
on
0 Posts
RE: BJCraft Episode
Man, If it were not for Dave having drawn up and kitting these awesome wings, I would have been begrudgiingly building my 11,000th set of foam wings and stabs. The weight savings is a great benefit and the jig really makes for a very straight wing. Most important to me is that I get to build a beautifully thought out wing. I love building at least as much as flying. I have missed it a lot these last several years. When I saw Jeff's Lightning and Dave Snows wings, I had to dive back in!
11-15-2011, 10:12 AM
#27
My Feedback: (34)
RE: BJCraft Episode
I agree completely. I am still considering buying an inexpensive router/laser cutting solution so I can play with different wing ideas. You can build a built-up wing much stiffer than a foam wing with a lot more 'options' available in planform and construction.
11-15-2011, 01:24 PM
#28
RE: BJCraft Episode
ORIGINAL: Doug Cronkhite
That's entirely possible Ryan. I know Christophe added the area from his canalizer into the total wing area on his Axiome, although there is some efficiency lost due to it being effectively a very asymmetric biplane.
What we REALLY need is for someone to tuft up a couple airplanes, and take a look at them in a real wind tunnel to see what's going on. I'm curious as to the effectiveness of CPLR's canalizer vs Naruke's fuselage strakes on his Asyuler External.
ORIGINAL: Ryan Smith
Correct me if I'm wrong, Doug.
My thought is that they are looking for a way to increase the wing area of the airplane. It has always been my understanding that winglets reduce the amount of vorticies present at the tips, making the outer 20% or so (I believe), more effective. Looking at the numbers, I think that they are making the wing smaller in area for both better snaps, and also because they are relying on the canalizer for a lifting surface. I would conclude that they are trying to increase effective wing area without actually adding it.
Correct me if I'm wrong, Doug.
My thought is that they are looking for a way to increase the wing area of the airplane. It has always been my understanding that winglets reduce the amount of vorticies present at the tips, making the outer 20% or so (I believe), more effective. Looking at the numbers, I think that they are making the wing smaller in area for both better snaps, and also because they are relying on the canalizer for a lifting surface. I would conclude that they are trying to increase effective wing area without actually adding it.
What we REALLY need is for someone to tuft up a couple airplanes, and take a look at them in a real wind tunnel to see what's going on. I'm curious as to the effectiveness of CPLR's canalizer vs Naruke's fuselage strakes on his Asyuler External.
anyone have a CAD model... I can run it in CFD!!
I modelled up a Yak 55 in Pro/E and ran a series of simulations in a KE condition.. moved the tail up and down on the fuse... and sure enuff... with a High Tail, I got a low pressure on top (push to nose) and a low tail would cause a high pressure on top (pull to canopy) and I could put the tail where it was perfectly null... at least at a specific Beta ...
Interestingly ... with zero beta, and rudder deflected 45 degrees.... regardless of where the tail is located, there is a nose up tendency...
on another note....
Others have commented on efficiency... funny... the fuselages are fatties, and the current Design Du Jour is a high drag rudder.....
I don't think we need any more efficiency!! lol
ORIGINAL: patternflyer1
..............I commend the designer of this airplane for thinking outside the box and trying something new. Without new ideas like this, there would be little advancement in designs. Does it work? I don't know, none of us do. Does it not work? We don't know that either. People are quick to speculate as to why things won't work though. In theory, I agree, this seems odd and theoretically, you all make sense to me.... Would love to have a plane I could chop us to try a bunch of different things on as Doug said.. Would be quite fun really.
Chris
..............I commend the designer of this airplane for thinking outside the box and trying something new. Without new ideas like this, there would be little advancement in designs. Does it work? I don't know, none of us do. Does it not work? We don't know that either. People are quick to speculate as to why things won't work though. In theory, I agree, this seems odd and theoretically, you all make sense to me.... Would love to have a plane I could chop us to try a bunch of different things on as Doug said.. Would be quite fun really.
Chris
Nice that he tried the winglets... (If in fact he has flown with them.. I dunno.,.. did he??)
But winglets are reasonably well understood... and as he has them shown will produce predictable consequences...
It is great that RC Models can evolve at a much more rapid pace than real aircraft!!! the turn around time is a couple orders of magnitude less as well as the financial risk being a fraction.. not to mention.. no human life at stake.....
But I bet the marketing department put those winglets on!!
lol
11-15-2011, 01:34 PM
#29
RE: BJCraft Episode
ORIGINAL: Doug Cronkhite
I agree completely. I am still considering buying an inexpensive router/laser cutting solution so I can play with different wing ideas. You can build a built-up wing much stiffer than a foam wing with a lot more 'options' available in planform and construction.
I agree completely. I am still considering buying an inexpensive router/laser cutting solution so I can play with different wing ideas. You can build a built-up wing much stiffer than a foam wing with a lot more 'options' available in planform and construction.
Woodie
11-15-2011, 02:13 PM
#30
RE: BJCraft Episode
ORIGINAL: woodie
I own a CNC machine (small one) and believe me, there is no 'inexpensive router/laser' solution. Talk about a money pit!!!
Woodie
ORIGINAL: Doug Cronkhite
I agree completely. I am still considering buying an inexpensive router/laser cutting solution so I can play with different wing ideas. You can build a built-up wing much stiffer than a foam wing with a lot more 'options' available in planform and construction.
I agree completely. I am still considering buying an inexpensive router/laser cutting solution so I can play with different wing ideas. You can build a built-up wing much stiffer than a foam wing with a lot more 'options' available in planform and construction.
Woodie
sure there is!!
lol
http://www.youtube.com/watch?v=pX1cO...eature=related
11-15-2011, 06:56 PM
#31
Senior Member
Join Date: Mar 2003
Location: Perth, AUSTRALIA
Posts: 1,881
Likes: 0
Received 0 Likes
on
0 Posts
RE: BJCraft Episode
That's not bad fidelity, but the head is small and the material is soft.
The cheapest way I've found of CNCing parts is to not own the router. Be the nerd who does the 3D work, and know when the machine is idle, and slip bits in to get done every now an then
The cheapest way I've found of CNCing parts is to not own the router. Be the nerd who does the 3D work, and know when the machine is idle, and slip bits in to get done every now an then
11-15-2011, 10:54 PM
#32
Join Date: Jan 2006
Location: Kaohsiung, TAIWAN
Posts: 134
Likes: 0
Received 0 Likes
on
0 Posts
RE: BJCraft Episode
BJ get aerospace engineering degree in Korea and he has good skill on pattern flying,I compet with him in 2006 Asia cup and his flight was excellent
His design combine the knology of aeromechanics and Pattern fly experience,So I think that will be the key for success on BJ Plane.
The most important of all......BJ Craft product was not expensive.
We really need this kind of product,Good performance good quality with cheap price!!![sm=thumbs_up.gif]
Go BJ
His design combine the knology of aeromechanics and Pattern fly experience,So I think that will be the key for success on BJ Plane.
The most important of all......BJ Craft product was not expensive.
We really need this kind of product,Good performance good quality with cheap price!!![sm=thumbs_up.gif]
Go BJ
11-16-2011, 06:15 AM
#33
RE: BJCraft Episode
ORIGINAL: Rendegade
That's not bad fidelity, but the head is small and the material is soft.
The cheapest way I've found of CNCing parts is to not own the router. Be the nerd who does the 3D work, and know when the machine is idle, and slip bits in to get done every now an then
That's not bad fidelity, but the head is small and the material is soft.
The cheapest way I've found of CNCing parts is to not own the router. Be the nerd who does the 3D work, and know when the machine is idle, and slip bits in to get done every now an then
Woodie
11-16-2011, 09:33 AM
#34
Member
Join Date: Dec 2008
Location: LiegeLiege, BELGIUM
Posts: 52
Likes: 0
Received 0 Likes
on
0 Posts
RE: BJCraft Episode
Hello,
It's possible to obtain a good router for a quite low price but you need (i) to have access to a mill and a lathe (ii) to find some salvaged materials and (iii) the most important... motivation.
Here is mine:
[youtube]http://www.youtube.com/watch?v=Vv-iV2ZrEAk&feature=player_embedded[/youtube]
It's possible to obtain a good router for a quite low price but you need (i) to have access to a mill and a lathe (ii) to find some salvaged materials and (iii) the most important... motivation
. Here is mine:
[youtube]http://www.youtube.com/watch?v=Vv-iV2ZrEAk&feature=player_embedded[/youtube]
12-05-2011, 04:49 PM
#35
Junior Member
Join Date: May 2011
Location: zhuhaiguangdong, CHINA
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
RE: BJCraft Episode
Hi pattern flyers....!
EPISODE wood working finish.
http://rcone.kr/board/index.html?id=bjair1&no=72
Have a nice pattern!....
EPISODE wood working finish.
http://rcone.kr/board/index.html?id=bjair1&no=72
Have a nice pattern!....
12-05-2011, 05:49 PM
#36
Join Date: Oct 2010
Location: Valencia,
CA
Posts: 44
Likes: 0
Received 0 Likes
on
0 Posts
RE: BJCraft Episode
This “EPISODE” starts test flies this week.
Designer BJ Park said “we want to talk together about new color scheme for Episode model".
Anyone have good color idea. please upload what is your idea.
12-06-2011, 09:26 AM
#42
My Feedback: (5)
RE: BJCraft Episode
Yellow base color with metallic purple (or metallic blue), red, silver trim. As for scheme, the Nuance scheme is pretty good. Go with red on the bottom wing with white or silver stripes for orientation. Stay away from a silver base color, it disappears in the overcast skies. I've flown a plane that was silver, long ago. Never again.
I like this yellow mid rex bipe scheme shown on the contra drive page.
I like this yellow mid rex bipe scheme shown on the contra drive page.
02-09-2012, 01:20 PM
#50
Senior Member
Join Date: Apr 2010
Location: Cape Town, SOUTH AFRICA
Posts: 2,744
Likes: 0
Received 1 Like
on
1 Post
RE: BJCraft Episode
very nice
not too concerned about the wing tips. They improve efficiency in lift but a wing is always lifting while its flying. You can bend those tips down if you like...