Freewing 90mm F-22 Raptor - Official Thread

[jasmith41]

T

As always, you're a wealth of information - thank you for all of that as well - very helpful. However, i was flying the eflite viper 90mm that fell out of the sky, and you're exactly correct - it started flailing like a fish out of water (yaw and roll) when it tip stalled... twice... :)

[Airguardian]

Tip stall is when the airflow detaches from the tip of the wing. On most backwards-sweep designs, tip stall also implies you partially or totally lose aileron control. To make things worse, tip stall will pretty much never occur in a symmetric way, so it causes the plane to yaw and roll out of control. Attempting to roll the plane back level only worsens the condition (due to asymmetric drag from the stalled tips) and instead gotta try to compensate with rudder when possible, or at least a combination of rudder and roll.

Tip stalls are usually not a big deal on a plane like the F-22 because you don't really lose roll control when the jet stalls, particularly if you have tailerons enabled.
That's not to say the plane can't depart controlled flight, but in the case of the F-22 that's more due to a lack of lateral stability once the vertical stabs get deprived from clean airflow due to building excessive angle of attack and not having ventral fins to compensate. #stealth

This said, you will more likely tip stall from planes being nose heavy than tail heavy. Nose heavy planes load more their wings, so you are constantly flying closer (in terms of AoA) to tip stalling. Having a nose heavy CG also makes corkscrewing dynamics much worse, further complicating tipstalls. So no, I don't think you experienced a tip stall on your F-22 because of being tail heavy. You probably just exceed too much AoA and lost directional stability.

If you had SAFE active, and being that an auto-level stabilization mode, chances are, once you lost speed, and hence, control authority, the plane started rolling and the gyro commanded counter-roll to compensate. In a near stall condition, counter roll will not actually produce a rolling outcome but instead a yawing in the opposite direction, what is used to flat spin these jets without thrust vectoring. Only you probably weren't commanding it consciously, but rather flying in SAFE mode turned out to be not that safe... I still encourage to use gyros in normal 'rate' stabilization mode and totally forget about auto level options (SAFE included) or just keep them for emergency situations in case you lose orientation. Flying with SAFE by default is outright dangerous IMO.

[jasmith41]

What is "tip stall"? I'll do the capacitor thing to be safe. I greatly appreciate all the info. from you'all. Thank you. John

While coming around on final either too slow or too nose high - probably both - she more or less rolled over to the inside. I'm also not sure my cg was correct either (probably not) - it could have been too tail heavy as well - and i had safe on, so that kicked in and it was all over the place coming down and the second time it happened (same flight), i couldn't save her - ripped both main wings off and broke one side of the tail wing.

It was a learning moment. New wings on and she still flies like a dream... thankfully.

[Evan D]

I've flown 6, 8, 10 and 12S... 5 or 6... The F-22 has a lot of lifting area. You may feel a slight difference if you are really in tune to this plane but probably not. The CG will move a little bit depending on battery, I would guess maybe 1/4". You will get more flight time if flying in the same manner, 30 seconds to a minute...

[Abwagner121]

For those of you using the 6S setup, are you running the 5k or 6k MAH batteries? I don't do much in the way of acrobatics or fly wide open for an entire flight. Has anyone tried both? If so, is there much of a change in CG? Or flight time?

[Warthog]

What is "tip stall"? I'll do the capacitor thing to be safe. I greatly appreciate all the info. from you'all. Thank you. John

[jasmith41]

Many have claimed to have issues with the BBs and a few have proven issues with them. Still others have swapped out or added higher voltage (6V or more) BECs and caused issues by doing so.

People claim it’s the radios fault when they crash?

#beenthere #donethat

Apparently tip-stalled my 90mm Viper on second maiden flight. After much advice and analysis by a bunch of good folks on here, i went thru every bird adding capacitors and rf chokes, and then the last time i flew the Viper perfectly, i took the time to make sure the cg was where it should have been and was careful not to slow down too much on final and she flew perfectly...
Chalking that one up to nothing more than operator error, and i learned what 'tip-stall' meant. New wings around and she's just like new.🤣🤣🤣

[crxmanpat]

The only time I had an issue with the blue box was when I was using XPS in my JR9303. For some reason it did not like that protocol. When I switched to Graupner the issues went away. I heard there were some Spektrum RX's it does not like either.

[Evan D]

Many have claimed to have issues with the BBs and a few have proven issues with them. Still others have swapped out or added higher voltage (6V or more) BECs and caused issues by doing so.

People claim it’s the radios fault when they crash?

[Warthog]

I have seen a few utube videos where the plane crashed because of a radio or servo glitch. Has anyone had a problem with this or the "blue box" in the plane?

[Warthog]

They were done by Alpha and are in this thread:

https://www.hobbysquawk.com/forum/rc...mm-f-22-raptor

Thank you!! I appreciate this.

[jasmith41]

They were done by Alpha and are in this thread:

https://www.hobbysquawk.com/forum/rc...mm-f-22-raptor

Freewing F-22 Upgrade/Accessory Parts by ShadowVFX - Thingiverse

[crxmanpat]

Oh! I’m looking for the kit files for the F-22 Raptor cockpit.

They were done by Alpha and are in this thread:

https://www.hobbysquawk.com/forum/rc-airplanes/rc-military-jets/161174-3d-printed-part-sets-freewing-90mm-f-22-raptor

[jasmith41]

Issue resolved!

8S F-22 Raptor - ESC out of sync due to my error when setting throttle endpoints.

Trying to use the Freewing ESC programming card to reset the ESC and I can get it to power up. The 150A ESC has a separate BEC with a switch. Tried plugging up the throttle wire to BEC on the cardper the instructions and the switch to the battery port. No luck. The ESC will go be quiet for a few seconds after I plug the battery into the main ESC (EC5), then go to a single repeating beep like it does when it is waiting to sync to the radio.

Any help would be greatly appreciated!

Did you get this resolved...?
Every time I get an error on bind, it's usually due to my incorrectly calibrating the ESC. I just have to start over and do it again to get rid of it. If I wait too long to pull the throttle stick back, the ESC goes into some other unknown (to me) programming mode. It's been a real pain in the ass sometimes, not knowing what i'm doing. The Mud Duck has been a great source of knowledge and help to me, as has XViper, Hugh Wiedenman, AirGuardian, and everyone else on here...

[Warthog]

Oh! I’m looking for the kit files for the F-22 Raptor cockpit.

[Warthog]

Could someone send me the link to the 3D printer file for the cockpit and any other upgrades? Thank you. John gforce@uia.net

[jasmith41]

Hi all,

the F-22 seems to be my next 90mm jet. I’m wondering if it makes sense to buy the 8s version. I’d like to start flying with a 6s setup and then switch to a 8s setup later when I’m more familiar with the airplane. What do you think, does this makes sense? Can you fly the 8s version with a 6s setup?

Thanks in advance for your advice!

6s

[McHero]

The 8S on a 6S battery may get off the ground (if flying off pavement) but it won't fly very fast, probably full throttle will be like 2/3 normal 6S throttle.

Thanks Evan! So, I’d better choose the 6s setup.

[Evan D]

The 8S on a 6S battery may get off the ground (if flying off pavement) but it won't fly very fast, probably full throttle will be like 2/3 normal 6S throttle.

[McHero]

Hi all,

the F-22 seems to be my next 90mm jet. I’m wondering if it makes sense to buy the 8s version. I’d like to start flying with a 6s setup and then switch to a 8s setup later when I’m more familiar with the airplane. What do you think, does this makes sense? Can you fly the 8s version with a 6s setup?

Thanks in advance for your advice!