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  1. #251
    Jim Cattanach's Avatar
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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    Finished building the Gryphon today. It is powered by a Merlin VT80.
    With 500grams of lead in the nose, along with a 4000ma ECU battery & two 2.2ma Rx batteries, it weighs 8.8Kg with full UAT.
    Unfortunately the weather is unusually bad for Cyprus over the next few days, so the maiden will be delayed.
    In a weeks time, I am also having a part removed (gallbladder), so more delay.
    JET FLYING:- Resistance is futile. You will be assimilated.

  2. #252

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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    Hi Jim,

    am also waiting to maiden mine when our site is in a better state! However mine came out to 11kg with an AMT Mercury!! I have around 450gr of lead in the nose, and have moved the turbine about 2.5cm forward. I also changed the rather heavy tailpipe to a lighter one. Has anyone's weight come out to 11Kg? Any chance of some info about the model's flying characteristics at this weight?

    Thanks and best regards

    Joseph

  3. #253
    Migf117's Avatar
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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    Hi Joseph

    mine is 10.8Kg so very close to yours, it flies like a fast pattern ship.
    very stable, I think at this wight give it a bit of ground speed before you pull the stick (that is what I do) so you get a smooth & scale like takeoff.
    the landing speed is not high, I mixed a bit of up trim with the flaps, it doesn't pick a lot of speed if the nose dropped a bit on the landing.
    the stall speed is quit low.

    I fly it just like flying a pattern ship even I do the basic routine of the IMAC with & it dose it perfectly.

    good luck with your maiden.

    Regards
    Moatasem

  4. #254

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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    Hi Moatasem,

    thanks for the info, will let you know how it goes.............

    best regards


    Joseph

  5. #255

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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    Hi Guys,

    What throws are you running for sport flying and also C fo G.

    Cheers, Craig.

  6. #256
    Jim Cattanach's Avatar
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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    Lost my Gryphon yesterday. It had about ten flights on it. It was a nice & easy jet to fly. I started an Immelman turn, with good speed, at the top of the turn all control was lost & the jet spiralled to the ground. All the control surfaces are fine, as are the servos. I can only think that the large wings blocked the airflow over the elevator, the jet stalled & went into the spiral dive.
    I have seen a similar thing happen on Viperjets. Just a point to watch out for.
    This post is just to warn others, not to complain.
    JET FLYING:- Resistance is futile. You will be assimilated.

  7. #257

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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    Is there any info on the orion jet , how to find price , avaliability , more pictures , colour schemes ?

  8. #258
    marc s's Avatar
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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    Yes indeed please email me - note you are talking the Orion which is a different jet to the one on this thread?

    marcs

  9. #259

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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    Hi Marcs

    I am testing a different set of landing gear for other Gryphon. What landing gear do you recommend? I am thinking about using electric version.

    Thanks,

    Mike
    Global Jet ARF PRO- Air-C-Race-Germany, CNC-Italy, Feibao, Gryphon/Redwings, Der Jet, Jet Legend, Ripmax Xcalibur, Aurora & more - globaljetclub.com

  10. #260
    marc s's Avatar
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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    Electron 50 series electric retracts and jet1A legs and wheels - very good combo.

    marcs

  11. #261
    ceffi's Avatar
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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    What landing gear do you recommend?
    Hi Mike,

    Dirk and I ordered yesterday an Electron 40, should be strong enough.
    Legs, Brakes and Wheels from Gaspar.

    Will keep you informed.

    Christian

  12. #262
    tirley154's Avatar
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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    Hi All,

    Just thought I would chip in with my thoughts. I have had several flights with my Gryphon now and have to say it's awesome. As I fly off a 100 meter grass strip, the barn door flaps and large wing area were essential in my choice and have proved a perfect combination. Fitted with a JetCat P80SE, kit supplied thrust tubes, Electron 40 retracts & sprung struts, it needed all batteries up the nose to obtain the CG. Landings are at walking pace into a headwind with good control, even with over half a tank on board. Flying characteristics are akin to a pattern ship, smooth, accurate and with an impressive turn of speed. I dislike the fuel tank shape, it's a poor design for fuel pick up during aeros. I opted to put a 500ml header tank (Sullivan Vee type + bubble trap clunk) in the wasted space underneath it, which so far has been great. No bubbles, no flame outs, I'm happy. All in all, a great sports Jet!

    Updates over the next few weeks,

    Dave

  13. #263
    marc s's Avatar
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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    For anyone interested I have a hand made tank for the Gryphon which I made for mine as I too felt the tank shape was too long and thin to allow proper fuel collection during aeros, the tank I have slots straight in the space between the ducts as per the original but is deeper and more 'square' in shape so much better for fuel delivery.

    If anyone is interested then PM me as I don't have a requirement for it anymore.... the tank is fully plumbed with my Pro-Filler end cap.

    A few pics of the tank...

    marcs

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  14. #264
    ceffi's Avatar
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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    Hi all,

    today I had the maiden with the Gryphon.
    One click on hight, thats all I had to trim.
    It flies great.
    I use a JetsMunt VT 80, electron retracts and struts and elektric brakes from JetsMunt.
    Works all fine.
    But dry wight is 10,6kg.

    CG is 185mm.

    Christian
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  15. #265
    tirley154's Avatar
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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    Hi Christian,

    Congrats on your successful maiden! Looks a nice tidy install, certainly neater than mine, lol. You might want to pull that CG back when you get used to it though. The Gryphon comes alive at 200 to 210mm. Not sure what mine weighs, will let you know. I expect they always come out at around 10kg dry though, it's quite a big jet.

    Dave

  16. #266
    ceffi's Avatar
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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    Hi,
    I think, CG can more to the rear.
    Short to the front of the wing tube should be a good position.
    I will try it.
    But next week we have a nice model fair (ProWing) and I will fly the Gryphon as DemoJet.

    All changes I will do later.

    Christian

  17. #267
    tirley154's Avatar
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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    Hi,

    Just weighed mine and it's 9.8 kilos dry (plus 2.5kg wet) with the fairly heavy JC P80SE and kit tail pipe. Batteries are 2 x 3000mah Life & 1 x 3200mah Lipo, mounted on a plate, right up the nose. Hope this helps?

    Dave


  18. #268
    sandrocacciola's Avatar
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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    These is my Gryphon...
    I have a problem with the exaust pipe: it's too heavy. Does anyone know how I can find one a lot lighter? And it's possible use one exaus pipe single?
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  19. #269
    ceffi's Avatar
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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    Hi Sandro,

    I would not use a single pipe due to the heat.

    I removed approx 200g lead. CG nearly by 200mm.
    Pics from the ProWing fair.

    The smoke by landing is from my JL Viper, flown by a friend.

    Christian
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  20. #270
    sandrocacciola's Avatar
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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    Hello!
    how did you remove 200 grams from the exhaust pipe?

  21. #271
    tirley154's Avatar
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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    I think he removed 200g lead from the nose to get the CG to 200mm. Not removed weight from the tail pipe.

    Dave


    ps. Love the scheme on your Gryphon!!!

  22. #272
    ceffi's Avatar
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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    I think he removed 200g lead from the nose to get the CG to 200mm.
    that's right

    Christian

  23. #273
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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    I have the opposite problem: have too weight rear becosuse my plane it's very light now: 8,1k dry..

  24. #274
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    RE: GRYPHON - build thread (sports/trainer 2m composite jet)

    Hi all,

    Had a dozen or so more flights now and must say it just gets better! With full rates and the cg at about 210mm, it's completely neutral and fully aerobatic. I settled on 15 degrees take off flap and 50 degrees for landing. Just for fun I GPS speed tracked it today, peaked at 188mph. Not bad for a little ole JetCat P80SE. Final AUW dry is now 9.5kg (21lbs), definately a keeper now it's all sorted.

    Dave


  25. #275
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    Just wandering if any others had experienced the fuel draw problems as Marc and a few others had commented on? Also is there another solution to this problem using the stock tank? I am planning on using a standard BVM uat installed on front tray bulkhead.

    thanks


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