Small site DS? - RC Groups
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May 05, 2010, 09:38 AM
Long to be flyin'
Antonsoarer's Avatar

Small site DS?

Anyone else had any results DS'n very small sites?

I don't have any decent DS sites locally so I had a go at a hill-fort cut on top of a local site. I was really surprised at the sound and acceleration! I now see why DS at any speed is so addictive. I was only able to manage asymmetric DS circuits (judging by the single loud 'crump' sound) losing everything I had gained as I came round for another dive in. It was interesting to note how the smoother air delivered more acceleration and passing thermals killed it.

Missing the lip by inches added to the fun and I soon learnt that gentle turns delivered the most but I think I need a purpose built model to retain the gains. This site is covered in dense heather and I was using a robust composite design so impacts were no issue.

I have seen the Co guys doing road cut DS which looked similar but this site is much smaller and the shear makes a lot of noise.

Once I sort out a new design I am thinking I will need to do about 40' circuits to keep things moving, without a gyro I imagine my reflexes won't be able to correct things quick enough.

Last edited by Antonsoarer; May 05, 2010 at 02:28 PM. Reason: typo
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May 05, 2010, 11:56 AM
Modelrater Deluxe
1-26 Flyer's Avatar
Keep at it... small sites are always a huge challenge and when the time comes to get to fly at a big site you will be amazed at how much easier it is.
May 05, 2010, 02:18 PM
Registered User
Daemon's Avatar
Ya, we've DS'ed road cuts that are only one lane instead of two, which is about
the scale that you're working with. If there's a place with wind, and another
without wind, you can DS between them if you've got a plane that'll make the turns

I've not had much luck with flat ground bush/hedge and tree DSing but we know
it's possible.

May 05, 2010, 02:38 PM
Objects in mirror are losing
1000MPH's Avatar

We have a slope called Red Rock that has a backside about 15' high. Before I knew what I was doing I tried to DS it with disasterous results. After learning to DS the "proper" way it was challenging but lots of fun. The spot is just West of the Reno air race site.
Here's a pic that is of no help.
May 05, 2010, 07:30 PM
Secret clown business
gizzo's Avatar
A buddy and I have been having fun DSing this carpark, on top of a cliff about 100' high with the bushes on the very edge, makes quite a calm area. The circuit goes from the bushes in front (or out the front, depending what you feel like) and the nature strip by the road, by the small pine trees. very small circle compared with a big hill. Just yesterday Dave was ripping it with his Gulp DS. Just up the path is another bush that can be DS'ed behind with a weael or some such, about 15' laps will do it. A hill fort, I wish. Luxury...
May 05, 2010, 10:36 PM
C'mon more Energy
Swoopdown's Avatar
I have even done small laps with a Bee behind a few shrubs. Ugly but it worked.
Lots of fun and great for the reflexes though tough on models.
May 07, 2010, 05:44 AM
Registered User
I'm a new pilot, only been at it about 3 months, but gliding, and I'm 43.

Our local slope is actually a cliff, but there's a valley next to it that I fly sometimes. The long time fliers all warn not to go there, but it's more challenging flying, and great for working on your reflexes.

I was flying there yesterday in a northerly (we need some west to fly properly off the cliff), and noticed that we had some boundary layer turbulence about 10-12 meters off the ground, coming from wind shearing off the ridge on the side of the valley. I'm thinking that ridges are possibly easier to DS in, because they provide a longer and more predictable route to fly along while building speed in whichever layer you are accelerating in.

My last DIY plane is much faster than anything else I've built to date, not sure if I can get it doing anything halfway respectable though, it's only got corflute ailerons. got to start somewhere though !
May 07, 2010, 03:29 PM
Registered User
Guys can you help me understand road cut DS a little better? I think I understand the idea, but not 100% sure I have it right. Is the circuit kind of flat horizontal, out over the edge and back in again?

Would this kind of DS also be possible on a cliff i.e. with flat horizontal circuits? What's the best way?

Thanks for any help!

May 07, 2010, 06:55 PM
The Predator
The Predator's Avatar
I made this video:
Scratched (4 min 14 sec)
for Antonsoarer being so grateful for the AWESOME airfoil designs he created for me! Hope it help Zimodile. And yes you can DS cliffs just the way you think but, in general the best time to do it, in my experiences, was using a light wind otherwise the shear tends to lean to far over leaving you with only a small wedge of calm air or no shear at all as wind speeds increase. . . opps!
May 07, 2010, 07:13 PM
Secret clown business
gizzo's Avatar
heres a vid of Dave and I DSing our local carpark, as described earlier.
the name of the game (3 min 36 sec)
May 07, 2010, 07:18 PM
Registered User
Thanks for those videos guys. I love the phrase "Dsing my local car park" - that's awesome! And top work on the videography both time - DSing and scratching tracks together twice in one evening - yeah baby!

May 07, 2010, 08:14 PM
Registered User
Sleedo's Avatar
Truro High Head DS 10-16-09 (2 min 26 sec)

My experience DSing in Cape Cod, light wind works best as Karl mentioned above as the shear disappears and there is too much wrap around from the sides in stronger conditions. Knap of the earth flying is always exciting even if the top speeds are nothing to brag about.

May 08, 2010, 12:49 PM
Registered User
thanks man - thanks cool - show's how it works really nice in that vid.


May 09, 2010, 11:43 AM
Registered User
Great videos! Thanks for sharing! I guess over here, you'd be arrested after 5 mins when you try to fly at such a site...
May 09, 2010, 07:22 PM
Secret clown business
gizzo's Avatar
Originally Posted by Sleedo

My experience DSing in Cape Cod, light wind works best as Karl mentioned above as the shear disappears and there is too much wrap around from the sides in stronger conditions. Knap of the earth flying is always exciting even if the top speeds are nothing to brag about.

How high is the front of the dune? I've tried a similar looking site with very limited success.

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