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I still haven’t received mine but have a preliminary suggested setup and CG I sent Denis for Grega to use. Once you receive yours, I will send you that sheet or an updated one if I’ve managed to fly mine already.
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It interesting how F5J planes have to almost be designed around a certain motor and battery in order to get CG right. I guess that's the advantage of designing the fuse so that the tail servos set WELL back and front part of fuse is long enough to be able to shift battery back and forth to achieve proper CG. Also I don't get these designers going with slimmer and slimmer Fuses,, this doesn't seem to make sense from an equipment install point of view ,, especially since my understanding is a slightly wider fuse doesn't make THAT much difference in drag right?
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Got my Ultima 2 prototype today.
Fit and finish is excellent, production parts are going to be incredible! Some quick pics of the parts. I expect the short tip version to way just shy of 1200 gr and with the long tips just shy of 1230 gr. The joiners are way stronger and wider than the Ultima 1 and have geometric features to help get a tight fit with lower friction during assembly. More information when I get the time. For now I’m racing forward to get it into the air as I have a competition next weekend 😉 |
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Absolutely beautiful Roy!! Great job man! you deserve applause for everything youve done for the Vortex/Ultima evolution in the past 2 years!!
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Last edited by FlyingGorilla83; Apr 25, 2018 at 12:42 PM.
Reason: needed more coffee
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HI Roy,
nice pics. Looks good the Ultima 2 I love the new design features and how you think about the details...as always smart engineering of team vortex I am excited to see it on competitions or maybe have it in my hands sometime Hope you are doing build pics and settings like in Ultima 1 thread. Regards Lukas |
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The build is progressing well. Hope to finish and maybe even maiden it this weekend
I will make more detailed posts of the build at a later time but in the meantime some random pics ImagesView all Images in thread
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Seems to be a step up on the build and design
Can’t wait to see one up close |
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Quote:
Grega’s model has a ballast tube and mine has a plate. I finished the build last night and hope to find some time for a maiden flight this weekend. With the short tips my weight is 1230 grams and long tips are at 1260 grams. I didn’t try to save any weight during the build, even my harness is over weight. With a cleaner build I could probably have knocked off another 20-30 grams. Carbon pushrods, Tenshock Viper 14T, 50 amp Graupner controller with telemetry, 850/1000 mah battery (allows cg changes of 3-4 mm), MKS HV6110 all around (flaps, ailerons and tails) The 2.4 solution is a nice feature but will evolve a bit in the production planes. In the meantime, I have my antennas mounted on a removable piece of wood which allows to break down the fuselage if required. ImagesView all Images in thread
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DS Composites new web site is in the air. It is still being updated but you will already find a lot of useful information in it.
http://vortex-soaring.com/ |
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WOW!
First day with the Ultima 2 and I LOVE IT!!! Went flying in the afternoon, medium wind when I got to the field, light wind to dead air when I left as the sun set. I flew both short and long tips and both are incredible. The short has amazing handling, the long has incredible performance and an unbelievably tight turn when needed. Impossible to stall the Ultima 2 in a turn, every time you think it’s too slow and you pull the stick and the wing gives a bit more and closes the turn. Long tips came out at 1260 grams, light tips at 1230 grams, even at such low weight penetration is excellent. Noam and Oury took turns flying the model and both loved it and remarked how easy both tips are to fly. In the following link a short clip of Oury flying the long tips in very light air is attached, its just 2-3 minutes after Oury took the controls of the Ultima for the first time, ended as a 10 min flight under 50 meters 😁 https://www.facebook.com/roy.dor.3/p...47828148607223 |
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Geeze Roy
Your killing me absolutely killin me! Now what?????
Cary |
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I couldn't resist and went flying again today.
First flights with an altimeter, attached are some of the logs. Task for today was to fly until I felt good about my potential and then start a landing timer and practice some landings. Air today was a bit tricky and was hard to climb high, above a certain altitude the air flattened out, inversion layer I guess... Still, quite a few very low starts (I wanted to see how low could I go) and the highest launch today was just around 60 meters. All flights today were with the long tips, I think I have it set up pretty good already so will measure my throws and prepare a setting chart. After the competition next weekend I will post my settings. Also played with CG today, workable CG is quite wide, I flew from 105-96 mm (remember it's a narrow wing) and all worked well although 15 was a bit aft to my liking and 96 was as far forward as I would go. I think for those who like aft CG's could probably go to as back as 110 mm. A good starting CG would be around 100 mm. I really like the way this plane lands, I usually like to come in "hot" and punch in the breaks at the last few seconds and the Ultima 2 breaks really well this way. The center is short but the flaps are wide and very effective. I'm actually landing the U2 better than the U1 which probably means I need to go back and modify my landing settings in the U1 a bit. Elevator is mounted a bit higher on the U2 so I also have lots of authority to push the nose down when needed and I also have snap flap to help bring the flaps up really fast when pushing down. I also flew with ballast today, the wind didn't require it but I wanted to feel the model with ballast and get to know it. I put 200 grams in it and it still breaks great in low wind with ballast, handling is good, turns tight and feels really well. Still climbed from low altitude and worked light bubbles well (last graph is with ballast). The 2.4 friendly solution seems to work well already and once we make the changes we're thinking about it should be really fantastic. Long tips are strong and even looping with 200 grams of ballast they held up well, a bit bendy but held well. I talked to Denis and production version will have a bit more spar to reduce the bending even further. This is just the second Ultima 2 flying so I am really impressed with it, fit and finish is really good, strength and weights are good,a few more models to work out the last details and it will be perfect! |
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