Official Freewing 90mm F-16 V2 EDF Jet Thread

[f4u ausie]

Lb. The more complicated... The more interested U r. Luv it:face_with_monocle:

[Elbee]

Hard to say... they were sent to me privately through Discord and Facebook Messenger, sooo...

I could bug a friend to post his 3DP files somewhere though.

AG,

I could design it, just like to see his methodology.

Did he cut off and reuse the OEM LE? Does it drop downward, slide forward, or a bit of both?, stuff like that.

Always thought an additional 0.5" at the root and a 0.5" at the tips 2" overall in wingspan would help and still not ruin the wing shape.

Fun things to ponder.

Best, LB

[Airguardian]

Airguardian.
Where do suppose I might find a picture of two of said modifications?

Best, LB

Hard to say... they were sent to me privately through Discord and Facebook Messenger, sooo...

I could bug a friend to post his 3DP files somewhere though.

[Airguardian]

Fully agree. Lighter wingload would be great, but working LEFs would work better and make the jet more interesting ;)

[Aros]

The F-18 problems are the result of the lack of working leading edge flaps. LEFs imcrease the usable sustained-high-alpha range and fix the nasty stall that haunts the airframe, as demonstrated by many people already, who modded the jet with working LEFs ;)

IF FW develops a new gen version, I hope it comes with LEFs! That and/or a slightly lighter wing load.

[Elbee]

Airguardian.

Where do suppose I might find a picture of two of said modifications?

Best, LB

[Airguardian]

The F-18 problems are the result of the lack of working leading edge flaps. LEFs increase the usable sustained-high-alpha range and fix the nasty stall that haunts the airframe, as demonstrated by many people already, who modded the jet with working LEFs ;)

[Aros]

I've actually had great success with my 8S version. No gyro, bone stock. I bring mine in much like xviper described in an earlier post. Nose high, manage throttle for altitude, bring her in with brakes. Plops down scale and unceremoniously every time. Even does great fully loaded. Unlike the F-18 which has given me inexplicable problems, this one seems like a sweetheart.

[Airguardian]

A tail-heavy setup run by a gyro is not 'child's play'. It will still be twitchy and sensitive. The gyro makes it usable and the aft CG enables crazy maneuverability, but it's a long shot from being 'child's play' ;)

My F-16's CG is about 35-40mm behind the manufacturer recommendation. The jet is beginning to be actually tail heavy at that spot. If I turn the gyro off, the jet becomes almost unflyable. But this way I can maneuver a lot more agile and do things that a normal setup isn't capable off, no matter how much you program on a tx. ;)

[xviper]

Oh wow. Mine is now 10 mm. Bhind Should I b nervous.. maybe sneek back to25 or just go to it. It has a plus as3x in it

I tend to start mine as close as possible to the published CG and see how it flies. If it flies the way I want it to, I leave it alone. My F-16 is about 10mm back, like yours. I did it because I wanted to be able to more easily get the nose up on final for the landing. This seemed to achieve that so I've left it there. If you like doing high alpha passes as a regular thing, then perhaps going even further back is worth a try but do it a few mm at a time. Even though this doesn't apply in most cases anymore, I'm still haunted by that old saying, "Nose heavy will fly OK. Tail heavy will fly once." Today, we have fancy TXs that can easily give us rates, expo and various mixes that help our planes fly and do things we used to have to do by finger intelligence. Then there are these new fangled gyros that can make many RC models (especially helicopters) operate like "child's play".

[f4u ausie]

Thanku airgardian

[Airguardian]

What xviper said.

Years ago, in the age of sh*tty low-blade-count EDFs, I used to default to high timing to give my birds a bit more oomph.

Nowadays, with the stock 9-12 blade setups most of us run, increasing timing is borderline suicidal. On something like a twin 70mm (Say, Freewing Su-35), going to high timing on modern EDFs can result in 160-180A current peaks if you are using good lipos.
Get ready to smoke them in a heartbeat and get 2-3min flight times if you aren't careful. Of course, your mileage may vary depending on the particular EDF and setup. The most sensible way to experiment with this is by having some measuring equipment or in-flight telemetry so you can quickly work out the effect of your changes before you get a nasty surprise. Most current-modern 12b EDFs I suspect must be running on medium timing by default... maybe low timing in some cases?

[f4u ausie]

Ok thanx

[Evan D]

I don't have a gyro in mine at that point.

[f4u ausie]

Oh wow. Mine is now 10 mm. Bhind Should I b nervous.. maybe sneek back to25 or just go to it. It has a plus as3x in it

[Evan D]

Where's your balance? About 25mm behind the factory CG is about right.

[f4u ausie]

Think I had to much elevator 8 mm more than high factory... Did that when on 6s. To pop it off the grass. 8 s gets off easily have reduced. Will try nose high bit further out.

[xviper]

Mine is also 8S. I fly it as it came. I can slow it down by opening up the speed brakes on final and getting into a nose high attitude about 100' from the apron. Then regulate the throttle so it doesn't fall too fast while keeping the nose high-ish. 8S, for me, tends to have plenty of poop and when I want a little more, I just use HV bats. The difference is noticeable but not enough to make me get more HV batteries. Today's newer batteries, even the lesser known ones seem to work quite well in my jets, even though the high "C" ratings are very much exaggerated.

[f4u ausie]

As always great info guys. The car analogy good!!! Evan at this stage it's regarding V2 F16.. we both have 8s. Think I will leave mine alone.. having enuf trouble landing it(compared to f4 phantom easy). My friend is retired so has more time to experiment .. but we r having a blast and do Wana get better thanx again

[Evan D]

Craig, what planes and set ups? Absolutely put a watt meter on anything first and after any changes. Many of the current FreeWing jets are at or even well over the rated amperage of the ESC in it. My 80mm's are 105-125A out of the box with a 100A. My 8S 90's are 115-125A on a 125A ESC. These are all on standard voltage batteries. HV are significantly more,