R/C Rocket Glider (S8E-P) Landing Practice onboard video

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georgegassaway

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Recently I began more intensive practice flying for the FAI’s S8E/P (E R/C Rocket Glide) event which will be held at the 2010 World SpaceModeling Championships (WSMC) being held near Belgrade, Serbia.

I am mostly practicing the landings. The most effective way to practice the landing part is to use a small hi-start, to pull the model into the air sort of like pulling a kite into the air. I explain the hi-start in the videos so I will not explain further. An extra plus is that it is CHEAP, once the hi-start parts have been obtained. It costs nothing per flight since the only thing expended from flight to flight is my own physical energy to go get it, hook it up, stretch it out, and make another flight.

I have been practicing from a local soccer field. Hi-starts do not work well in weeds, so the soccer field was the most practical site for me to use.

Friday, I did some practice flying with a keychain video camera onboard, borrowed from BRB member Jonathan Dill. And that is really the main reason I am posting this, the three videos linked below:

First landing practice video is posted here:
https://www.youtube.com/watch?v=TdB_ZezOZlA

Second landing practice video is posted here:
https://www.youtube.com/watch?v=tZ12ntQal4c

Third landing practice video is posted here:
https://www.youtube.com/watch?v=SdIz5NaWg0k

The videos turned out very nicely.

The model is a Stingray-Flap design which goes back to 2002 when the S8E event changed from pure duration (Max times of 7 minutes), to S8E/P (the P for “Precision”). The model uses three channels, two for the inverted V-tail and one for the flap in the center section.

The flap is very important because the landing rules are different now. They used to be a “runway” landing, with a 50 meter long line, we tried to land close to the centerline of the 50 meter long runway. Now, it is a bull’s eye Spot Landing. Landing within 1 meter, get 100 points. Landing within 2 meters, 90 points, and so on, to 10 meters, 10 points, then zero outside of 10 meters. There is still a target time of 6 minutes, or 360 seconds. So the perfect score would be to land right at 6 minutes, for 360 points, and to land inside of 1
meter, for 100 landing points, for 460 total.

So this is why in the video I am trying to land as close as possible to the red cup that I am using as the spot. Not the landing tape, that is used only for measuring distance, the red cup is the target.

I am also doing rocket boosts for practice, of course. But the scoring mentioned above is why it is more important to practice the landings a lot more than the boosts and the glide. That assumes one has a good model to begin with, that is set up well for doing the boosts, and a lot of experience doing boosts and flying thermals in glide.

Attached are some photos of one of the Stingray-Flap models.

Last photo is Greg Stewart, myself, and Kevin Kuczek with our models in Lleida, Spain at the 2008 WSMC.

- George Gassaway

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Very cool George, thanks for posting.

I flew RC HLG for years. This would be a great way to combine my passions.

Are there plans or kits for these?
 
>>>>>>
Are there plans or kits for these?
<<<<<

Plans, I'll have to get back to you.

Kits, there used to be some good ones by VectorAero, the original Stingrays and Cuda, but those are long OOP. The &#8220;Cuda&#8221; was the lower priced one, using foam core balsa skinned wings and partly balsa fuselage front section that the builder made. While the Stingrays had the wings and tail surfaces prefabbed, plus a fiberglass nose section, and cost several times more.

I put some web pages about the Cuda on my website:

https://homepage.mac.com/georgegassaway/GRP/GLIDERS/CUDA/CudaMain.htm

There is a small HL glider, I think the Colibri, that some have converted for rocket boost.

>>>>>>
Which Stingray is that you added the flap to ? I or II ?
<<<<<<

None of the above. In late 2001 to early 2002, Phil Barnes, Dave O&#8217;Bryan, & I discussed what kind of design we&#8217;d like to use for the 2002 WSMC. We agreed on a wing that did not have the constant curve of the original Stingrays, so that the center section could be flat for a flap (Curved dihedral as the previous Stingrays used, does not work for a hinged flap). Phil did most of the fabrication for the semi-kits, Dave O&#8217;Bryan assisted, and we all three flew them. While the Chicago-built Stingrays of the 1990&#8217;s got numbers, like 3, 4, 5, and 6, we called those 2002 models &#8220;Stingray-Flap&#8221;. Also unlike the previous Stingrays which used fiberglass skins, these used Kevlar skins for extra strength to help make them hold up better due to landing abuse. I have called the event &#8220;Precision Crash&#8221; for a reason.

Now what could be considered a kit that I &#8220;added&#8221; a flap to, could perhaps be the Cuda. I made some Cuda-Flap models in 2001 to use at the Team flyoffs. But the main thing I used was the foam cores, skins, and the basic layout for the tail planform. I totally revised the fuselage layout (engine under the wing, wing on top of fuselage) and used a lighter graphite tailboom than the Cuda kit had. Also I had to do major reinforcement to the wing during fabrication to make it strong enough to hold up on boost due to the strength and torsional rigidity lost to cutting out the flap area. You can see it on this page:
https://homepage.mac.com/georgegassaway/GRP/GLIDERS/CUDA/CudaFlap.htm

BTW, my first airborne videos were with a modified Stingray-Flap model. Using a GearCam. I added a special camera pod on top of the wing that could be set to point to the rear for boost. Then when I wanted to during glide, I could use the 3rd channel to flip the pod around 180 degrees to point forward for the rest of the flight. You can look for my other YouTube videos and find some of those flights.

- George Gassaway

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Uploaded three more videos of landing practice. These are single flights, with video less than 2 minutes long. Since the previous three videos, the field has now had the soccer markings added. So I did a lot of flying using the center field circle for the location for the red target cup. Then due to a wind shift which brought one of the goals into the approach area, I moved my red target cup (and measuring tape) over to a different area.


https://www.youtube.com/watch?v=bEytql2tTwA

https://www.youtube.com/watch?v=qP6KwebSh9w

https://www.youtube.com/watch?v=7AeugRsEYhE

- George Gassaway

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