Experimental Cub Kit with Slotted Wing 180 Hp and Big wheels any suggestions on kits
- Thread starter Lowleveldevil
- Start date
flyrite
Registered User
Lyons,GA
Didnt install mine for low AOA’s obviously , and discovered only afterwards that they are much more effective at helping the wing than VG’s at producing lift at ALL AOA’s. Was a Unintented benefit that was gained.
I’m sure at the expense of some cruise. Not a factor for me . If I’m going somewhere I chose a different mount.
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BC12D-4-85
SPONSOR
Fairbanks, AK.
I wonder if adding a short metal trim strip to the bottom of the slat would control the AOA when they deploy? Some sort of right angle piece of metal like a Gurney Flap perpendicular to and sticking down into the airflow that would add more resistance so they fully retract in cruise flight. May just be a solution looking for a problem.
Gary
Gary
Southern Aero
SPONSOR
kcco/1ga2
If you add a good flap to the mix the slats come out a lot sooner than a clean wing..... less AOA. Here's a good demo of the Helio in a couple of you tube videos. One is a old factory video that sux, hard to see. The other is at an airshow with pretty good video. The Helio CAN fly at those high AOAs but doesn't need to........ save that for the flair. .........FWIW
https://www.youtube.com/watch?v=tKCRuNYDOh4
https://www.youtube.com/watch?v=XRU5BLMnOCA
https://www.youtube.com/watch?v=tKCRuNYDOh4
https://www.youtube.com/watch?v=XRU5BLMnOCA
Lowleveldevil
MEMBER
Thx Phil I would be very interested in your machine details and rough cost in home building. Performance and suggestions all appreciated. I will be in the US in April to check some stuff out.
cubdriver2
FRIEND
upstate NY
After watching that Langley video would it be that hard to add a slot/slots just behind the leading edge and in front of spar to a stock flap? Looks like it would be beneficial?
Glenn
Glenn
mike mcs repair
Registered User
chugiak AK
isn't that what the backcountry rev 3 wing has? stewart might have a link to the video/picture of it
BC12D-4-85
SPONSOR
Fairbanks, AK.
CamTom12
Registered User
Huntsville, AL
I think it’s really important to point this out because it’s a common misconception. I do not intend to come across as priggish.
Airplanes have pitch attitudes. Wings have angles of attack.
AoA is the angle between the chord line and the relative wind.
When you change the configuration of the wing (by deploying flaps, and certain leading edge devices (no slats)), you automatically change its AoA by changing its chord line.
It seems like petty semantics but here the words have meanings: the slats on the Helio pop out sooner when the flaps are deployed because at a given fuselage pitch attitude, the wing is flying at a higher AoA with the flaps out than with them retracted.
https://www.grc.nasa.gov/www/k-12/airplane/geom.html
Airplanes have pitch attitudes. Wings have angles of attack.
AoA is the angle between the chord line and the relative wind.
When you change the configuration of the wing (by deploying flaps, and certain leading edge devices (no slats)), you automatically change its AoA by changing its chord line.
It seems like petty semantics but here the words have meanings: the slats on the Helio pop out sooner when the flaps are deployed because at a given fuselage pitch attitude, the wing is flying at a higher AoA with the flaps out than with them retracted.
https://www.grc.nasa.gov/www/k-12/airplane/geom.html
mike mcs repair
Registered User
chugiak AK
site seems like spam... wants to give you a download of flash no mater which button you choose... malware I bet!!
BC12D-4-85
SPONSOR
Fairbanks, AK.
Does nothing with my I-Mac but show pics and play videos. Like this:
https://scontent-dfw5-1.cdninstagra...n.mp4?_nc_ht=scontent-dfw5-1.cdninstagram.com
Gary
CamTom12
Registered User
Huntsville, AL
They should close up when the flaps are retracted. Do the ones on the shock cubs not do that?
aktango58
FRIEND
18AA
Isn't that what the Dakota Cub wing is?
Designed after the military slotted cub wing. Pretty incredible wing- just adds weight.
You have to look at the flap to see what I mean. Take a standard flap and add a fixed slot on top of it. Now take that flap and stick on the wing. The top flap seal covers both slots but the bottom now has two open slots instead of one like you have in a normal flap. Looks like it should just bolt on with no extra moving parts.
DENNY
DENNY
Southern Aero
SPONSOR
kcco/1ga2
Usually wing tips and nose
Cubus Maximus
Registered User
I've seen it both inboard and outboard of the slot. (or one put on the cabane)
mike mcs repair
Registered User
chugiak AK
I've seen it both inboard and outboard of the slot. (or one put on the cabane)
I wouldn’t want inboard like that.
Sent from my iPhone using SuperCub.Org mobile app
mike mcs repair
Registered User
chugiak AK
wireweinie
FOUNDER
Palmer, AK
The spar is the main structure there. The rest pretty much holds the correct shape. Lights that close inboard are going to create lots of glare issues.
Web
mike mcs repair
Registered User
chugiak AK
and light up the prop, ruining your night vision....
Southern Aero
SPONSOR
kcco/1ga2
The farther the light is laterally or vertically from your line of sight, the better you can see......... less light reflected directly back to you.
Confucius say............... :lol:
Confucius say............... :lol:
Gordon Misch
MEMBER
Toledo, Wa (KTDO)
Right. Did that once and never again. Can't see a thing past the prop.
Lowleveldevil
MEMBER
Thx Phil that is exactly what I wanted to hear
pittsdriver
MEMBER
Here is the airplane exactly configured like the OP and all these discussions are about. Airframes Alaska widebody fuselage, Dakota Cub square tip wings with fixed slots, Lycon 220hp O-360, MT9 constant speed prop. 2200gw, 1270ew. Cruise 110mph, stall 30ish. This airplane performs really well. With a light breeze gets off in a couple of fuselage lengths and lands in 100' without too much drama. I would not use the slotted wing as like bill says it really doesn't start working until you are at a high angle of attack. It is almost stall/spin proof as you can do whatever you want with the stick and pedals and it just wallows around and never breaks. But if it were mine I would go with the Javron wing and Keller flaps. The customer wanted to keep it certified so I had to go with the Airframes Alaska fuselage. I will never use one again. It was not even close to the quality of a Javeron.I know I could do a Javeron in the 1100-1150ew range. So yes this combination works pretty good but I think there are better ways to go.
Attachments
RVBottomly
PATRON
Asotin County Washington (KLWS)
I'm curious about details regarding the slotted wing. It performs really well but you wouldn't use them? Is it because of drag? I know folks talk about them only working at high angles of attack, but that's been balanced by folks who use them day to day.
I have trouble keeping up with the latest, but do you think a Javron wing with Keller flaps is a better choice than a Mackey slatted wing with Keller flaps? Just trying to sort out things.
Also, for anyone to answer--Can one still get the Mackey slats as a kit? Other than this thread, it seems like discussion on them dropped off around 2013.
Thanks,
Vic
pittsdriver
MEMBER
They are heavy, roll rate is less than a Javron square tip wing and angle of attack. The customer insisted that i use the Dakota Cub wings so that's what I used. The customer is always right.
