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Jan 21, 2019, 06:58 AM
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Cybear_GBG's Avatar

Ground effect vehcile


I scratch built this vehicle based on films i watched of other designs on youtube. It is a bit long 1000mm x 70mm (full length of the white foam board I used). It can do a stable flight but lacks in maneuverability so I need alot of space to fly it.

Clip of my ground effect vehicle

RC WIG Ground effect vehicle (2 min 31 sec)
Last edited by Cybear_GBG; Jan 21, 2019 at 07:26 AM. Reason: Adding the clip, spelling
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Jan 21, 2019, 01:09 PM
Registered User
Quote:
Originally Posted by Cybear_GBG
I scratch built this vehicle based on films i watched of other designs on youtube. It is a bit long 1000mm x 70mm (full length of the white foam board I used). It can do a stable flight but lacks in maneuverability so I need alot of space to fly it.

Clip of my ground effect vehicle

https://youtu.be/Dio4uW-n0co
need to add FPV cam so you can long range test it on a lake
Jan 21, 2019, 01:20 PM
Registered User
Quote:
Originally Posted by hamburger
Lipo postion can be either on front or rear wing.
anyone have advice for dimensions of clearance at trailing edges? Would the craft benefit if the entire chambers were larger - I could increase height of the sides.
There were some posts about a similar tandem wing design way back at the start of this thread, unfortunately a lot of the pictures were hosted on now defunct sites leaving us with just the text. Nevertheless here is some info:

https://www.rcgroups.com/forums/show...18&postcount=7

https://www.rcgroups.com/forums/show...87&postcount=8

If you search for 'tandem wing' or 'jorg flairboat' I think there are others. The main thing is that the front wing needs to be at a higher angle than the rear one, the opposite of what you have now. A suggested CG position was around the trailing edge of the front wing. Never experimented with tandem wings myself so can't help out more but that may be a good starting point.

Quote:
Originally Posted by Cybear_GBG
I scratch built this vehicle based on films i watched of other designs on youtube. It is a bit long 1000mm x 70mm (full length of the white foam board I used). It can do a stable flight but lacks in maneuverability so I need alot of space to fly it.
Can never have too many bixels!

May have seen the video on youtube already but here is a bixel build I done a few years ago. It was a lot more successful that my other recent bixel attempt here. I think the main thing is keeping it close to parallel with the ground rather than sitting up steep on the floats/skids. Also try extending the skids forwards past the leading edge to get the contact point further forward, mitigates the tendency to dig the nose in from the drag.

I've not got any WIG projects on the go anymore, lack the space to run them properly. Still trying some interesting stuff with hovercraft on the other thread.
Jan 22, 2019, 05:36 AM
Hamburger
hamburger's Avatar
Quote:
Originally Posted by FiftySlicks
There were some posts about a similar tandem wing design way back at the start of this thread, unfortunately a lot of the pictures were hosted on now defunct sites leaving us with just the text. Nevertheless here is some info:

https://www.rcgroups.com/forums/show...18&postcount=7

https://www.rcgroups.com/forums/show...87&postcount=8

If you search for 'tandem wing' or 'jorg flairboat' I think there are others. The main thing is that the front wing needs to be at a higher angle than the rear one, the opposite of what you have now. A suggested CG position was around the trailing edge of the front wing. Never experimented with tandem wings myself so can't help out more but that may be a good starting point.
good info, thank you. I will give it another try soon
Jan 25, 2019, 05:57 PM
Really?
dll932's Avatar
Quote:
Originally Posted by Cybear_GBG
I scratch built this vehicle based on films i watched of other designs on youtube. It is a bit long 1000mm x 70mm (full length of the white foam board I used). It can do a stable flight but lacks in maneuverability so I need alot of space to fly it.

Clip of my ground effect vehicle

https://youtu.be/Dio4uW-n0co
Nicely done.
Feb 03, 2019, 06:03 PM
Hamburger
hamburger's Avatar
Quote:
Originally Posted by hamburger
good info, thank you. I will give it another try soon
I built a second one following all intel I could find but never got into ground effect. The tandem is fast gliding on the skids but no more. Maybe it is just too heavy or too slow? It is fun and welcome deviation nevertheless
Feb 22, 2019, 12:58 PM
Registered User
Quote:
Originally Posted by hamburger
I built a second one following all intel I could find but never got into ground effect. The tandem is fast gliding on the skids but no more. Maybe it is just too heavy or too slow? It is fun and welcome deviation nevertheless
I'd wager the high motor mounts are pushing the nose down under power and preventing a proper liftoff. My first thought is to put the motors right at the leading edge of the front wing so they blow air underneath. This should easily get it skimming in ground effect but might become a little bit too much at higher speeds. Would also have to watch the CG after moving the motor weight around.

If you keep the rear mounted motors, lower them as much as possible, if you could get the blades just above the top surface of the rear wing that would be good. Maybe also add in some down-thrust. There's a really delicate balance to keeping the nose down enough in flight so it doesn't flip back, but not so much that it prevents the nose lifting off completely.
Feb 22, 2019, 06:24 PM
Hamburger
hamburger's Avatar
Quote:
Originally Posted by FiftySlicks
I'd wager the high motor mounts are pushing the nose down under power and preventing a proper liftoff. My first thought is to put the motors right at the leading edge of the front wing so they blow air underneath. This should easily get it skimming in ground effect but might become a little bit too much at higher speeds. Would also have to watch the CG after moving the motor weight around.

If you keep the rear mounted motors, lower them as much as possible, if you could get the blades just above the top surface of the rear wing that would be good. Maybe also add in some down-thrust. There's a really delicate balance to keeping the nose down enough in flight so it doesn't flip back, but not so much that it prevents the nose lifting off completely.
Next I will try lowering the rear motors, possibly with down-thrust.
If not successful, then I would try either a bixel style or something like this https://www.rcgroups.com/forums/show...4&postcount=13

Thanks for the guidance and encouragement
Mar 31, 2019, 12:39 PM
TheyreComingToTakeMeAway!
derk's Avatar
With my tandem, I found that using 2 different airfoils helped keep the stall speeds different, the high lift wing in the front has a lower stall speed, so the nose will keep up. It also lifts first but carries more weight than the rear. It seemed to work well on pavement but never got very high in flight. The front wing has more angle of attack than the rear the rear is very low, maybe 2 degrees, the front is more like 6.
Mine had wheels to lower the starting friction, but they only held it up off the ground a few mm. Here is an on board video:
WIG2.AVI (0 min 28 sec)


Feel free to ask about it if you need additional information.
Derrik
Apr 09, 2019, 08:53 AM
Registered User
Quote:
Originally Posted by Cybear_GBG
I scratch built this vehicle based on films i watched of other designs on youtube. It is a bit long 1000mm x 70mm (full length of the white foam board I used). It can do a stable flight but lacks in maneuverability so I need alot of space to fly it.

Clip of my ground effect vehicle

https://youtu.be/Dio4uW-n0co
VERY IMPRESSIVE! im impressed that the pontoons are dragging with no tendency to ground loop!

i like the Bixel design except that the weight needs to be far forward to fly properly

i hope u develop tis further and make larger models for water testing.

maybe a small fixed canard close to the wing root at about 10 degrees dyhedral may help it to maintain height in turns.
Last edited by captarmour; Apr 09, 2019 at 09:00 AM.
Apr 09, 2019, 09:16 PM
Usually lurk'n, not post'n

Full size plane / hovercraft


Hi everyone.
Just dropping this link here for your interest & viewing pleasure.
A full size ekranoplan hovercraft made in a shed. Sorry, but I don't have any details beyond the news story linked below.

https://www.abc.net.au/news/2019-04-...ntion/10985994
May 20, 2019, 11:34 AM
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S_Vladimir's Avatar


LUCH-5 - new ekranoplane project.
Until will present platform (wings in the process)
May 20, 2019, 11:48 AM
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S_Vladimir's Avatar


LUCH-5 - the first access to the water
Модель СВП ЛУЧ-5 (rc-model LUCH-5) (4 min 8 sec)


View from aft camera
Боковая камера модели СВП ЛУЧ-5 (5 min 46 sec)
May 21, 2019, 11:40 AM
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S_Vladimir's Avatar



LUCH-5 - tried on wings:


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