RC Jets Discuss RC jets in this forum plus rc turbines and ducted fan power systems

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

Reply
Old 01-06-2013, 04:37 AM
  #251
Jim Cattanach
 
Jim Cattanach's Avatar
 
Join Date: Mar 2003
Location: Larnaca, , CYPRUS
Posts: 2,085
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default 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.
Jim Cattanach is offline  
Reply With Quote
Old 01-06-2013, 10:07 AM
  #252
kkn
 
Join Date: Mar 2005
Location: GhajnsielemGozo, MALTA
Posts: 87
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default 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
kkn is offline  
Reply With Quote
Old 01-06-2013, 04:13 PM
  #253
Migf117
 
Migf117's Avatar
 
Join Date: Sep 2005
Location: Perth, AUSTRALIA
Posts: 55
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default 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
Migf117 is offline  
Reply With Quote
Old 01-06-2013, 09:41 PM
  #254
kkn
 
Join Date: Mar 2005
Location: GhajnsielemGozo, MALTA
Posts: 87
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default 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
kkn is offline  
Reply With Quote
Old 01-07-2013, 01:51 PM
  #255
craigdyer
 
Join Date: Sep 2004
Location: Sydneynsw, AUSTRALIA
Posts: 194
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default 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.
craigdyer is offline  
Reply With Quote
Old 02-24-2013, 12:25 AM
  #256
Jim Cattanach
 
Jim Cattanach's Avatar
 
Join Date: Mar 2003
Location: Larnaca, , CYPRUS
Posts: 2,085
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default 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.
Jim Cattanach is offline  
Reply With Quote
Old 03-23-2013, 08:18 PM
  #257
cassiemitch
 
Join Date: May 2010
Location: Herveybay, AUSTRALIA
Posts: 153
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default 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 ?
cassiemitch is offline  
Reply With Quote
Old 03-24-2013, 12:52 AM
  #258
marc s
Thread Starter
 
marc s's Avatar
 
Join Date: Jan 2007
Location: farnborough, , UNITED KINGDOM
Posts: 3,131
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default 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
marc s is offline  
Reply With Quote
Old 03-26-2013, 07:13 AM
  #259
mikedenilin
 
Join Date: Jan 2004
Location: Irvine, CA
Posts: 1,686
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default 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
mikedenilin is offline  
Reply With Quote
Old 03-26-2013, 09:27 AM
  #260
marc s
Thread Starter
 
marc s's Avatar
 
Join Date: Jan 2007
Location: farnborough, , UNITED KINGDOM
Posts: 3,131
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GRYPHON - build thread (sports/trainer 2m composite jet)

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

marcs
marc s is offline  
Reply With Quote
Old 03-26-2013, 11:39 PM
  #261
ceffi
 
ceffi's Avatar
 
Join Date: Dec 2003
Location: 34590 WabernEurope, GERMANY
Posts: 239
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GRYPHON - build thread (sports/trainer 2m composite jet)

Quote:
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
ceffi is offline  
Reply With Quote
Old 04-28-2013, 01:23 AM
  #262
tirley154
 
tirley154's Avatar
 
Join Date: Dec 2003
Location: Norfolk, UNITED KINGDOM
Posts: 22
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default 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
tirley154 is offline  
Reply With Quote
Old 04-28-2013, 02:29 AM
  #263
marc s
Thread Starter
 
marc s's Avatar
 
Join Date: Jan 2007
Location: farnborough, , UNITED KINGDOM
Posts: 3,131
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default 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

Attached Thumbnails
Click image for larger version

Name:	Sq48138.jpg
Views:	72
Size:	68.1 KB
ID:	1876674  
marc s is offline  
Reply With Quote
Old 04-28-2013, 11:08 AM
  #264
ceffi
 
ceffi's Avatar
 
Join Date: Dec 2003
Location: 34590 WabernEurope, GERMANY
Posts: 239
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default 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
Attached Thumbnails
Click image for larger version

Name:	Eb86782.jpg
Views:	85
Size:	61.0 KB
ID:	1876803   Click image for larger version

Name:	Bw72576.jpg
Views:	165
Size:	58.7 KB
ID:	1876804   Click image for larger version

Name:	Mr39841.jpg
Views:	128
Size:	48.9 KB
ID:	1876805  
ceffi is offline  
Reply With Quote
Old 04-28-2013, 12:10 PM
  #265
tirley154
 
tirley154's Avatar
 
Join Date: Dec 2003
Location: Norfolk, UNITED KINGDOM
Posts: 22
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default 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
tirley154 is offline  
Reply With Quote
Old 04-28-2013, 12:27 PM
  #266
ceffi
 
ceffi's Avatar
 
Join Date: Dec 2003
Location: 34590 WabernEurope, GERMANY
Posts: 239
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default 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
ceffi is offline  
Reply With Quote
Old 05-03-2013, 07:40 AM
  #267
tirley154
 
tirley154's Avatar
 
Join Date: Dec 2003
Location: Norfolk, UNITED KINGDOM
Posts: 22
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default 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

tirley154 is offline  
Reply With Quote
Old 05-14-2013, 06:02 AM
  #268
sandrocacciola
 
sandrocacciola's Avatar
 
Join Date: Aug 2006
Location: Grosseto, ITALY
Posts: 212
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default 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?
Attached Thumbnails
Click image for larger version

Name:	Vt58751.jpg
Views:	80
Size:	107.8 KB
ID:	1881882   Click image for larger version

Name:	Hc93733.jpg
Views:	59
Size:	105.9 KB
ID:	1881883  
sandrocacciola is offline  
Reply With Quote
Old 05-14-2013, 08:01 AM
  #269
ceffi
 
ceffi's Avatar
 
Join Date: Dec 2003
Location: 34590 WabernEurope, GERMANY
Posts: 239
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default 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
Attached Thumbnails
Click image for larger version

Name:	Db86026.jpg
Views:	79
Size:	56.4 KB
ID:	1881896   Click image for larger version

Name:	Zv66740.jpg
Views:	69
Size:	72.8 KB
ID:	1881897   Click image for larger version

Name:	Ty65810.jpg
Views:	60
Size:	9.3 KB
ID:	1881898   Click image for larger version

Name:	Tm30914.jpg
Views:	65
Size:	26.5 KB
ID:	1881899   Click image for larger version

Name:	Do82366.jpg
Views:	61
Size:	29.9 KB
ID:	1881900  

Click image for larger version

Name:	Lc49119.jpg
Views:	67
Size:	23.0 KB
ID:	1881901  
ceffi is offline  
Reply With Quote
Old 05-15-2013, 05:52 AM
  #270
sandrocacciola
 
sandrocacciola's Avatar
 
Join Date: Aug 2006
Location: Grosseto, ITALY
Posts: 212
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GRYPHON - build thread (sports/trainer 2m composite jet)

Hello!
how did you remove 200 grams from the exhaust pipe?
sandrocacciola is offline  
Reply With Quote
Old 05-17-2013, 08:46 AM
  #271
tirley154
 
tirley154's Avatar
 
Join Date: Dec 2003
Location: Norfolk, UNITED KINGDOM
Posts: 22
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default 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!!!
tirley154 is offline  
Reply With Quote
Old 05-17-2013, 12:06 PM
  #272
ceffi
 
ceffi's Avatar
 
Join Date: Dec 2003
Location: 34590 WabernEurope, GERMANY
Posts: 239
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: GRYPHON - build thread (sports/trainer 2m composite jet)

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

Christian
ceffi is offline  
Reply With Quote
Old 05-20-2013, 06:28 AM
  #273
sandrocacciola
 
sandrocacciola's Avatar
 
Join Date: Aug 2006
Location: Grosseto, ITALY
Posts: 212
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default 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..
sandrocacciola is offline  
Reply With Quote
Old 06-02-2013, 01:59 PM
  #274
tirley154
 
tirley154's Avatar
 
Join Date: Dec 2003
Location: Norfolk, UNITED KINGDOM
Posts: 22
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default 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

tirley154 is offline  
Reply With Quote
Old 03-17-2014, 11:48 AM
  #275
voodoodb
 
voodoodb's Avatar
 
Join Date: Jun 2002
Location: Flora, MS
Posts: 532
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

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
voodoodb is offline  
Reply With Quote
Reply


Thread Tools
Search this Thread
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 02:04 AM.