rcjets_63

My Feedback: (4)

You can order replacement pins from Airpower or Dreamworks. Comp-Arf may have them too.

Regards,

Jim

joeflyer

My Feedback: (48)

Stainless steel is too hard. It's better to break or bend the pin than destroy a retract or retract mount. It would be better to have a solid pin than threads on part of it.

Don't you have a hardware store nearby? If you don't want to make yours then you can try Dreamworks, Robart, or McMaster-Carr. Some of the larger hobby shops in the UK may also have them.

Joe

rcjets_63

My Feedback: (4)

Edited and reposted.

siddus74

Jim,

I cant offer any advice on your colour schemes ...

On the dreamworks site the list the retract makes, what make can I use for getting the replacement pins for my retracts?

Anybody?

Scott.

rcjets_63

My Feedback: (4)

Scott,

The first thing you need to know is the diameter of your steering pin. Once you have that, it's easy. Don't worry about the length; anything you order will be long enough that you might have to cut it a bit anyway.

Most likely you've got a 6mm pin, in which case you'll want the RA-250 pin from AirPower. See [link=http://www.airpowernet.com/twe3/product_info.php?products_id=158]http://www.airpowernet.com/twe3/product_info.php?products_id=158[/link]. They are only $4 US so order 2-3 so you have spares.

If you have a 1/4" pin, then you'll want the Dreamworks 1/4" pin. See [link=http://dreamworksrc.com/catalog/14-steering-pin-p-1185.html]http://dreamworksrc.com/catalog/14-steering-pin-p-1185.html[/link]. They are $7.49 for a pair.

If you have a different sized pin, just do a search on "pin" and "axle" on the Dreamworks site and you'll get items in a variety of sizes including 3/16".

Either way, you'll probably end up ordering from Dreamworks since they have recently taken over all orders from AirPower due to Dirk (AirPower) being in a recent accident. If you haven't ordered from Dreamworks before, fear not, they have awesome customer service.

Regards,

Jim

ron Sweeney

Hi Scott, The replacement is a High Tensile steel cap headed machine screw of the correct diameter. Your local ''fastening' shop will have them any length and diameter. Look them up on the net or in yellow pages. Ron.

rcjets_63

My Feedback: (4)

Hi Gents,

Well I got the color scheme sorted out so I edited my earlier post; here is what I found that is applicable to Swiss, Czech, and Hungarian Gripens.

According to a letter I have from Saab Aerosystems, the colors for the Gripen are custom but correspond to the following colors in FED-STD-595.

- Upper Surfaces: FS36173
- Lower Surfaces: FS36375
- False Canopy (Hungarian): FS36076


The markings are also done in these colors. Markings are as follows:
- Markings on the upper surfaces (over FS36173 base color) are FS36076.
- The Emergency Opening, Emergency Engine Shut Down, Fire Fighting, and Cut Here markings are FS36076 over a field of FS36375
- Markings on the lower surfaces (over FS36375 base color) are FS36173

Attached is a graphic showing the various markings based on a scan of a decal set. The writing is too small to make out in many cases so I've duplicated the wording and stated the location of the markings.

Regards,

Jim

roydefiant

great detective work thanks roy

siddus74

Jim,

Can you photograph your canard deflection for landing please?

Scott.

tuan lam

My Feedback: (1)

1/4" up on canard 1/2" up elve landing with power nose up 45 degree touch down like a kite and this one I can flying knife edge all day who said Delta wing can't fly knife edge?

rcjets_63

My Feedback: (4)

Scott,
For landing, the canards are deflected 9mm up (measured at the leading edge of the canard at the root chord) and the mix between from elevators/canards is turned off (canards don't move with elevator input).

Tuan,
Thanks for posting photos of your bird; it looks great. What field do you fly out of in Texas?

Regards,
Jim

siddus74

So you have active canards during the flight but raised 9mm and static for landing? elevon control only? does this de-sensitise it?

Scott,

rcjets_63

My Feedback: (4)

Yes, yes, and yes.

Jim

siddus74

SAAB 78

I use same setup as Jim and I confirm it works great!

coolt5

My Feedback: (2)

hi all

i just get one jas-39 from Jetlegend and i have a jr 11X TX so can any one help me how to setup my TX to get 3 mode flight for the jas-39 pls .

thanks

coolt5

My Feedback: (2)

any help pls

rcjets_63

My Feedback: (4)

Coolt5,

Sorry, I didn't see your earlier post.

I have a 12X transmitter and would expect the programming is approximately the same as the 11X. The mixes are all basically associated with the canards. You want to mix elevator to canards using the 3 position switch to enable/disable the mixes. My mixes are (approximately as follows)
- 3 position switch in up position - Mix 1 on Elevator to Canard, high % mix - this moves the canards at high rate (use for takeoff)
- 3 position switch in middle position - Mix 2 on, Elevator to Canard, low % mix - this moves the canards at low rates (used for flying)
- 3 position switch in down position - Mix 3 on, Landing gear to Canard, adjust % mix to give 9mm up canard - this deflects the canards up 9mm and there is no elevator/canard mix (used for landings)

Let me know if you need anything else.

Jim

coolt5

My Feedback: (2)

rcjets_63

thanks for replay

I just need more details on how to connect the servo also for the right mix.. EXP

The tow servo on the wings. One of them will go to elevator and the other one will go to aileron and I will setup my transmitter to elevon so they will work together as elevon

The canard will go in to ????? aux 1 or 2 and then use mix program to mix it with the elevator ? is this right .

And as u said Mix 3 on, Landing gear to Canard, adjust % mix to give 9mm up canard - this deflects the canards up 9mm and there is no elevator/canard mix (used for landings) in this

case the canard will be fixed 9mm up without movement at all and only elevon will control the landing from the back...

thanks for ur help man

rcjets_63

My Feedback: (4)

Coolt5

The two servo on the wings. One of them will go to elevator and the other one will go to aileron and I will setup my transmitter to elevon so they will work together as elevon
Correct!

The canard will go in to ????? aux 1 or 2 and then use mix program to mix it with the elevator ? is this right .
Correct. It doesn't matter which Aux you use (I use Aux1). Then the mix elevator to it.

And as u said Mix 3 on, Landing gear to Canard, adjust % mix to give 9mm up canard - this deflects the canards up 9mm and there is no elevator/canard mix (used for landings)
Correct!

In this case the canard will be fixed 9mm up without movement at all and only elevon will control the landing from the back...
Correct!

Regards,

Jim

coolt5

My Feedback: (2)

Thanks jim for ur help and u r funny way of answer LOOOOOOL but sorry I am still learning that’s way I was precise.


something else i have the jas-39 from jet jet legend and i doesn’t have awing tube is that right or its missing . i just have to pieces of metal going to the fuselage and also the wing dost have opening or slot for the wing tube.....?

rcjets_63

My Feedback: (4)

Coolt5,

The Jet Legend Gripen doesn't have a wing tube. It uses aluminum blade spars that are glued into the wing and fit into recepticles attached to fuselage formers. You can see them in the bag on the right in the photo below.

Jim

whitcombe

Guys I spent 11 years carrying out functional tests and fault diagnostics of flight controls and there stability systems on Sea Harrier FA2's and Harrier Gr7's with her Majesty the Queen. I have been flying for over 24 yrs with 14 years on turbines and have recently been fine tuning and flying a FEJ Rafale. Its the same configuration as the gripen with the close coupled canard and wing and seems to show similar charactoristics. I have been flying with the canards set slightly up on takeoff and have had no sudden leaps into the air. Canards are disabled once the wheels are up and I have been able to get good high alpha in the turns and barrel roles with no nasty habits. Landings are nice and controlled with no pitchiness. Anyway, what I was thingking about was the feasibility, on the gripen, to have no input to the carnards during flight i.e fixed but with a rate gyro connected to the canards but getting its signal input from the elevator channel with a mix which cancels out the canard movement during stick movementonly i.e the canard is controlled solely by the gyro. So when you initially put in an up elevator command the canards remain fixed and the elevons deflect up. The aircraft rotates but the carnard reacts to any uncommanded increases in pitch rate and thus captures the aircrafts nose. When the elevator is released the gyro equipped canards maintain any pitch angles until a commanded pitch input is given i.e elevator stick. That way the gyro maintains independant control of the canards and any pitch undulations and the elevons handle the commanded flight movements.

This is just purely hypothetical but just wondered if it was feasable. And before anyway say's "well you try it and let us know" I will first try it in a ground based functional test/simulation before risking any models.

Thought ??

Tim

rcjets_63

My Feedback: (4)

Tim,

That's an interesting proposal. We've pretty much confined the fixed up canard configuration on landing; I don't think anyone has tried it yet on take off. While the Rafale and the Gripen both have canards and delta wings, I THINK the Rafale doesn't have it's wheels as far aft as the Gripen and certainly it doesn't have the wide almost flat-bottomed fuselage nose as the Gripen. I've flown the Fei Bao Rafale (as well as watched others fly it) and it doesn't leap off the ground to the extent of the Gripen.

I'm not sure that I follow your explanation of the way the gyro would be connected. If I'm understanding you correctly, you would connect the signal input to the elevator and then cancel it out with a mix? Why not just connect it to an unused channel? What defines an uncommanded increase in pitch RATE? Isn't releasing the elevator a commanded pitch input?

I think the problem with the leaping off the ground is that it takes a lot of up elevon (and up canard) to lift the nose and, once lifted, air gets under the nose causing it to continue to rise. The pilot must immediately counter by reducing the up elevon/canard to prevent over-rotation. I try to accomplish this but am only successful about 1/4 of the time. On the full-scale Gripen, the canards elevate to raise the nose then depress to control the angle of attack (see illustration below). I would think that the canards being connected to a gyro with an inclinometer input which tries to maintain a given nose up angle (say 3-5 degrees) is the solution. However, perhaps I've misunderstood your suggestion; please elaborate.

Regards,

Jim

rcjets_63

My Feedback: (4)

Double post - sorry.