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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/12/2012 12:29 PM   
marc s



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Status: offline 		Mike,

I think Scott used the standard pipe and bypass, so as you say seems to be OK. it will be good to see the difference in nose weight required when I set mine up.

I am installing Electron retracts in mine as the GBRJET electric units are a little behind schedule, hope to have electric brakes running at CJ though.

marcs

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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/12/2012 12:46 PM   
BaldEagel



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I think there will be a big market for electric brakes, especially as that will get totally rid of the reliance on an air system for the UC, with the ultra reliable A123 batteries these systems will become more of the norm IMO.

Mike

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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/12/2012 1:08 PM   
Robrow



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quote:

ORIGINAL: marc s

Mike,

I think Scott used the standard pipe and bypass, so as you say seems to be OK. it will be good to see the difference in nose weight required when I set mine up.

I am installing Electron retracts in mine as the GBRJET electric units are a little behind schedule, hope to have electric brakes running at CJ though.

marcs


Marc, I have a couple of sets of Behotec wheels I would like converting to electric brakes, are there any prerequisites?

Rob.

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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/12/2012 1:38 PM   
marc s



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I depends a little on the hub and wheel.

Once we have the production Stinger units shipped which should be very soon we can look at the aftermarket options, the key is the electronics that drive it and this part is done and working 100%.

marcs

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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/13/2012 6:01 AM   
Migf117



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Status: offline 		Hi

I've received my Gryphon last week & I started working on it. It is great model. The quality is amazing & the very light Wight is a big bounce.
I finished building one wing & I did reinforce to the nose wheel mount.

Scott, What about the control surfaces throw???!!!

I managed to get 25mm on the ailerons & around 35 degree on the flaps. Will I need more on the flaps?


Cheers
Maotasem

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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/13/2012 10:59 AM   
marc s



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This should help.

marcs



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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/13/2012 11:11 AM   
BaldEagel



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Status: online 		Unless you know what movement 100% is trying to work out 40% is impossible.

Mike

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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/13/2012 11:12 AM   
schroedm



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Status: online 		Marc,

I assume you mean degrees and not % on those movements?

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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/13/2012 11:28 AM   
DominicM



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Status: offline 		100% = 90degs I'd guess.

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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/13/2012 11:31 AM   
madmodelman



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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/13/2012 12:31 PM   
Duncan



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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/13/2012 12:45 PM   
madmodelman



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Status: offline 		Max control surface movement 90 degrees each way = 100% movement each way, not rocket science really.

Rock on Dom!

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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/13/2012 12:52 PM   
BaldEagel



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Status: online 		Big assumption left open to lots of interpretation, and if it can be interpreted in a different way someone will do it, as Schroedm said giving the movements in degrees leaves no one in doubt how large the deflection should be no matter where on the surface it is measured.

Mike

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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/13/2012 1:03 PM   
steve2972


 

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Status: offline 		I never bother paying attention to recomended throws.I just program my Tx rates at 60%,80%,and 100% before a test flight and adjust after.


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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/13/2012 1:25 PM   
marc s



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Status: offline 		Degrees lads, degrees.....

Revised schematic attached

marcs


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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/14/2012 1:52 AM   
Migf117



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Status: offline 		Thank you Marc.

now I've to find a way to increse the thorw on the falps. I'm no way near 60.



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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/14/2012 3:39 AM   
mikedenilin


 

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Status: offline 		Hi All,

Here are some photos of Gryphon maiden. What's wrong with RCU? I can't load my pictures for the past one hour and I am in the USA, not Iraq. Finally got them up there.

Photo 1: Scott was polishing my Italian ride. That's added pressure for me on a maiden.
Photo 2&3: Taxiing it.
Photo 4-6: In the air. My cameraman did not have the camera ready when I took it off. Straight run down the runway with 15 degrees of flaps. Very smooth rotation
Photos7-9: landing - It's easy to land. Flaps all the way, carrying 2 to 3 clicks of throttle until it's over the runway and cut the power and flare. It lands slow. Brake is a bit too tight so I have to pause the brakes until it stops, but still can't prevent creating some flat spots on the tires.

First flight: C.G was at 180mm and it's nose heavy. By the third flight we took out 16 oz or more - I forgot the exact number, Scott has all the settings and data. He should come on the threads and give you an update.

The flight went very well. The VT-80 push it very good and has a very balanced power. It flies a lot like a pattern plane. If you decide to put a 100N engine, it will fly like a rocket with almost unlimited vertical. I prefer the 80N engine as it has adequate thrust for beginner/intermediate jet pilots. The top speed can reach about 180 mph after 1 big lap. Each flight takes 10 minutes with about 1/4 fuel left in the tank.

It's an impressive plane in quality. I hope Scott will load up some photos of his excellent installation shortly, and the current setting. I will sneak out on Thursday and fly some more.

Cheers,

Mike

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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/14/2012 7:11 AM   
steve2972


 

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Status: offline 		Looks great,glad maiden went well


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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/14/2012 7:23 AM   
Jeremy_D



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Status: online 		Well done on the Maiden Flight!! Looks great


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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/14/2012 7:35 AM   
Migf117



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Status: offline 		Congratulation Mike...

I hope will have more & more successfully flights.

I can't wait to finish & fly mine.

I've a question, is the elevator servos save where they are above the trust tube???

It’s my 2nd jet & my first had no servos close to the engine. So I don't know.

I'm isolating all the wires coming from the tail servos of course. But what about the servos?



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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/14/2012 7:52 AM   
mikedenilin


 

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Status: offline 		Thank you all. Our camera lady was at Tuscon Jet Rally so we don't have high quality video, except an iPhone video taken by a local member. I will try to get a copy from him.

The stock pipe runs very cool. We can actually touch the single wall pipe while engine is running. I don't think your elevator servos are going to have heat issues. However you might want to cover them with some aluminum heat shield materials just in case you have a hot start.

This Jet is simple to operate than most of my scale jets, and the red and yellow shows up very well in the air. I am very happy that I did not put any scratch or dents on this plane except some dead bugs and finger prints. We will remove more lead from the nose and will find a sweat spot for CG.

Here is what I have

Jr 10x converted to 11channel ACT. Radio with plotless servos 10Ch ACT RX with smart fly turbo EQ6, Merlin VT80, euro kit retract and landing gear, CAT air trap. Weights 21lbs empty. Has about 20oz of nose weight, but expect to go lower with newer pipe.

Mike

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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/15/2012 3:04 AM   
Migf117



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Status: offline 		Thank you Mike.

Great feedback.

I'm going to use a bit bigger engine on it " as it is the only engine I have now", it TJT Eagle 3000 which 12kg trust.
I know it is a bit over kill but I'll dial it back a bit. I'm sure I'll need more Wight in the nose as my engine is bigger, I'll push all the batteries to the nose & I hope that will help.

Mike, in your landing pics, you said that you had the flaps all way down & in the pics It was only like 30 degree, so is that the max throw you got?


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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/15/2012 4:16 AM   
mikedenilin


 

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Status: offline 		Flaps angle - it's about 35 on my setting. It can be more. I will talk to my builder and see if we can increase the angle even more, say 60 or so, than I can really slow it down. Mike

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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/15/2012 9:51 AM   
marc s



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Status: offline 		I did find myself easing the joint between wing and flap to get the 60 degrees travel, just make sure the horn allows this movement - if it does get in the way you can always notch the wing skin in this area.

marcs

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RE: GRYPHON - build thread (sports/trainer 2m composite... - 3/27/2012 7:21 PM   
marc s



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Status: offline 		OK back on the project following some time on pressing 'other' jobs.

Now the retracts from Electron have arrived and the legs from Jet-1A, who I have to say are very helpful indeed and offer a great service.

Having heard from a few the nose gear and mains mounting plates are a little weak I added and beefed up the nose gear mounting with some extra ply formers glues to the existing and Aeropxied in place, I also added some extra ply to the rails to add some thickness to them to help achieve a stronger frame.

The Electron nose retract has the built in steering coupling, its a nicely made unit but I was struggling to work out how to hook up a servo to it without having to use wire connections which I personally hate. The Gryphon has a servo plate already fitted just forward of the tank but I decided to try a more direct linked system. I cut a piece of FR4 to fit round the main retract body and use the mounting holes as a fixing point, the FR4 plate then extended away from the main unit to allow for a servo to be mounted on it a few inches away from the steering tiller. I connected the servo to the tiller with clevis links and made sure the hole positions for the servo arm matches those of the tiller arm to avoid issues. The unit seems strong and fits nicely inside the nose section, gives positive steering, no slop and no wires to get hung up.

The wing wheel well cut-outs were not centralised on one wing, I suspect the template used to cut these moved during the routing process. Looking at the tyre options from Jet-1A I wanted to use as large a wheel as was possible, three reasons, one its better for grass to have a bigger wheel, second the ones I have seen fitted to some Gryphon's just seem a little too small, and third as I want to try to fit our new e-brakes I needed to give myself as much room as possible in the wheel hub area. I chose 75mm diameter wheels and 147mm long legs which seemed about right.

I had a friend cut me a couple of ply jigs to re-cut the wheel cut-outs, these included an 85mm diameter wheel hole to allow for the new bigger 75mm unit. A Proxxon drill, small flanged bearing and cutter through its centre was used to run round the template and re-cut the new opening.

Nose wheel is now in, mains are awaiting some 8mm dowels to connect them to the retracts. I still need to strengthen the main retract plates before final gear fitment but should have this done during the next few days.

marcs

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