Official Freewing JAS 39 Gripen 80mm EDF Jet

[Icarus the 2nd]

Hi all, big fun a few days ago, a friend recorded some footage from a different angle

[Airguardian]

6S 6000mAh is way too big and heavy of a pack to use on the Gripen, at least without some serious tail ballast to make up for the balance.
Try the 4000mAh pack first and see if that gets you off the ground. Chances are, you are trying to take off with a jet even more nose heavy than the already ridiculously nose heavy factory recommendation. I mean, most people here are flying 25-30mm behind the marks. Some of us go even further back to 40mm (hard to achieve). If you are AHEAD of the CG marks, then I'd dare say it's a good thing that your jet never lifted off the ground. That flight wouldn't have been pretty.

[muzamilabbasi]

2100kV is a 70mm EDF motor... There is no way to get a good balance with a 6000mAh battery. Even balanced by the marks under the wing the Gripen flies very nose heavy. Read about how all of us, at least most of us are balancing ours.

A lot of delta's rock. Especially if it's windy for some reason. Yes, high gains cause oscillations.

Sorry for the incorrect info, it came with upgraded 3658-2150Kv

[muzamilabbasi]

Thanks guys, will try out a 4000mah battery next. Also I didn't had any gyro turned on the day wasn't that windy. Will retry it thank you

[Evan D]

Exactly my point, two different things.

[kallend]

A lot of delta's rock. Especially if it's windy for some reason. Yes, high gains cause oscillations.

Oscillations due to gain being too high are usually very fast. "Rocking" due to delta aerodynamics are generally much slower. It's pretty easy to to tell the difference. I found the Gripen to be particularly susceptible to rocking. I don't remember how I cured it since it was 3 years ago, but I think a HobbyEagle gyro with fairly high yaw gains did the trick.

[Evan D]

A lot of delta's rock. Especially if it's windy for some reason. Yes, high gains cause oscillations.

[Evan D]

2100kV is a 70mm EDF motor... There is no way to get a good balance with a 6000mAh battery. Even balanced by the marks under the wing the Gripen flies very nose heavy. Read about how all of us, at least most of us are balancing ours.

A lot of delta's rock. Especially if it's windy for some reason. Yes, high gains cause oscillations.

[Reptielenfreak]

Rocking is mainly caused by to high of a gyro rates. A delta winged jet is sensetive to gyro corrections making is wabble

[muzamilabbasi]

Hi I flew with jeti assist rx, 6000 mah hrb 60c 6s pack

[kallend]

I just flew the Grippen, I had a 6s 6000mah pack, had a hard time taking off and felt loss of power even on full throttle. Now this model is running 2100kv motor, I also noticed the wing was rocking and noticed that when you open gear door it flies better. Has anyone. experienced anything similar?

Thanks

It would help if you told us your setup (receiver, gyro, etc.)

[muzamilabbasi]

I just flew the Grippen, I had a 6s 6000mah pack, had a hard time taking off and felt loss of power even on full throttle. Now this model is running 2100kv motor, I also noticed the wing was rocking and noticed that when you open gear door it flies better. Has anyone. experienced anything similar?

Thanks

[Gizmo6023]

What is the trick to removing a canard servo? Seems the servo lead is stuck, likely got glued to something.

[Gizmo6023]

You have a warranty, have Motion send you a replacement, whether a wheel or assembly.

Warranty expired 23 days ago while I was out of state for work so I am now looking for a suitable replacement to purchase.

[kallend]

You have a warranty, have Motion send you a replacement, whether a wheel or assembly.

Both the kits I bought this year came with big yellow notices saying the warranty is only good for 30 days. So it's best not to dilly-dally in checking everything.

[Evan D]

You have a warranty, have Motion send you a replacement, whether a wheel or assembly.

[Gizmo6023]

Just started on my Grippen and discovered one of the nose wheel tires is out of round, checked the site for spare parts and the only nose wheels are part of a nose gear set, no separate wheels.
Does anyone know of a suitable replacement for the stock nose wheel assemblies?

[kallend]

They are located deep in the recess of where it popped out. there is a plastic piece with a hole for the nub. Took me using a dental pick to find it ! The nubs I created with toothpicks were actually too long, once I shortened them and knew where they went they popped right in. Gear doors fixed. Did not cancel the order for the gear doors, old adage, if you have the spare parts on hand you'll never need them. It's the ones you don't have that you need!

Oh, OK. I thought you meant you'd found them for sale on the Gripen spare parts list somewhere.

[Tipstalled10]

Where did you find them?

They are located deep in the recess of where it popped out. there is a plastic piece with a hole for the nub. Took me using a dental pick to find it ! The nubs I created with toothpicks were actually too long, once I shortened them and knew where they went they popped right in. Gear doors fixed. Did not cancel the order for the gear doors, old adage, if you have the spare parts on hand you'll never need them. It's the ones you don't have that you need!

[kallend]

Found the hidden hardpoints. Ordering new gear doors.

Where did you find them?