Official Freewing 90mm F-15C Eagle Thread

[flyinhigh042]

You can fly the stock F-15 as is, just don't expect it to take off and climb out at a fast pace, when you rotate, pull the gear up asap and let it clean up and it will get going, it's not bad, I flew mine stock for a few flights and sold it because of the performance just wasn't there for me, bought another one and put the FW 4068-1680kv unit in, it flies so much better, I also tried the new FW 4068-1835kv unit and that works even better, longer flight times and a little more vertical. It is worth the investment and I did use the stock ESC with no problems so far, but that is up to you to decide if you want to stay with the stock ESC.

That’s excellent info, thanks for taking the time. I live in Colorado at about 4500’msl. The air is a little thin up here. I’m tempted to get a few flights on it before spending the upgrade $$$. If I like the F-15 overall after a couple flights, then the upgrade would be worth it.
Thanks again.

[DCORSAIR]

I’m all but ready for the spring flying season to arrive... I have a question regarding the stock F-15 outrunner. I’ve been getting feedback lately from various people on the Motion RC Facebook fan page that state the outrunner version is lackluster and overall provides poor performance. And, the inrunner upgrade is the only way to go. Any input from members of this group would be greatly appreciated. I have no issue upgrading to the inrunner if it’s worth it.

Would the inrunner upgrade require full replacement of the fan unit? And how about the stock ESC?

Thanks all!
Jeff

You can fly the stock F-15 as is, just don't expect it to take off and climb out at a fast pace, when you rotate, pull the gear up asap and let it clean up and it will get going, it's not bad, I flew mine stock for a few flights and sold it because of the performance just wasn't there for me, bought another F-15 and put the FW 4068-1680kv unit in, it flies so much better, I also tried the new FW 4068-1835kv unit and that works even better, longer flight times and a little more vertical. It is worth the investment and I did use the stock ESC with no problems so far, but that is up to you to decide if you want to stay with the stock ESC and take a chance, and yes it is a complete fan and motor replacement. Get the 4068-1835kv complete unit and it is a drop in fit, you will have to change your CG, the upgrade is a heavier unit. Well worth the $150 investment.

Some people will tell you to try the FMS 90mm 1900 and it works better and all that blah blah, I tried it and it wasn't much better than stock, maybe I didn't have it set up right or something but it didn't work for me.

[flyinhigh042]

I’m all but ready for the spring flying season to arrive... I have a question regarding the stock F-15 outrunner. I’ve been getting feedback lately from various people on the Motion RC Facebook fan page that state the outrunner version is lackluster and overall provides poor performance. And, the inrunner upgrade is the only way to go. Any input from members of this group would be greatly appreciated. I have no issue upgrading to the inrunner if it’s worth it.

Would the inrunner upgrade require full replacement of the fan unit? And how about the stock ESC?

Thanks all!
Jeff

[adb2@suddenlink.net]

Does anyone happen to know the length of the nose gear from the begining of the shaft to the tip of the tire. I want the fold back gear on my Raptors nose gear and it looks like the F 15 nose gear might fit but can't find any dimensions.

[flyinhigh042]

Welcome to Hobby Squawk!!! The F-15 is a nice bird!!! Happy New Year!! Jerry

Thanks Jerry! Looking forward to getting this thing going. And Happy New Year!

[Hardway]

It’s here! Thanks Motion RC. This thing is beautiful. Next up, order an Admiral Carbon 5100...

Welcome to Hobby Squawk!!! The F-15 is a nice bird!!! Happy New Year!! Jerry

[flyinhigh042]

It’s here! Thanks Motion RC. This thing is beautiful. Next up, order an Admiral Carbon 5100...

[rifleman_btx]

That looks really nice!

[gooniac33]

I've been flying mine with a RoaringTop 6S 6250 35C, and after 3 minutes of spirited flying I still have like 3.76 left in the pack.

If I hadn't been flying like an idiot I am sure that it would have been about the same. However my current set up pulls around 145amps peak. Here are the videos of those 2 flights... the plane was very happy!!
.

[bill34207]

I use a pair of 4s 5000's and get around 3 and a half minutes, lands around 3.8 per cell.

[crxmanpat]

I've been flying mine with a RoaringTop 6S 6250 35C, and after 3 minutes of spirited flying I still have like 3.76 left in the pack.

[gooniac33]

I got a flight this past weekend with the Hobby Star 6s 50c 6200mah pack and man was it a blast! My plane is modded but usually gets 3 mins flat... no time to spare... I flew really hard and would have normally depleted my pack. Landed with 3.65v per cell... I may have a new fave F-15 pack....

[DCORSAIR]

I've got the 1835kv 90mm inrunner to try out in mine. Winter weather pretty much set in here. I'll do some static testing . Compare numbers to the stock setup. Won't be till after xmas though..

Yes, please let us know how that power plant works out in the F-15, I'm happy with mine the way it is but want it for a couple of other 90mm jets that I might purchase, I can't find the 1680kv unit anymore, don't know if they are going to be replaced with the 1835kv or what but they seem to be out of stock.

[Lon]

I've got the 1835kv 90mm inrunner to try out in mine. Winter weather pretty much set in here. I'll do some static testing . Compare numbers to the stock setup. Won't be till after xmas though..

[RMatteson]

The reason I put it in was it has a lower amp draw then the inrunner, which I hope might be easier on my lipos. This is the same fan used in the new Raptor, which if you go by advertised weight is very close to the F-15 and also the F-4. I'm not sure why the Raptor was pushed as lighter then the F-4, but when I get mine we will see, where they all come in on weight. I have watched the video of both the F--22 and F-4 and for my flying style and comfort zone,, they fly plenty fast. I don't have a super large area to fly out of our bounds of our club field, as I see in some of the videos. Many of you guys are lucky to have such huge fly over areas where you can wring out these jets to the max. It is the beginning of the crap weather here in upstate NY, so I don't think I will get it out to try to spring.

[DCORSAIR]

I like the sound of the 4068-1680kv is my problem, it has a nice woosh that sounds good to my ears for some reason, I like sound better than performance so that is why I went with the 4068-1680 in all my 90mm jets, didn't care for the whine of the 9 blade, but I gained both so I'm happy with the upgrade. Hope you like the 9 blade, it will fly the F-15, watch your timer because when I had the stock F-4 Phantom I was only able to get 2 1/2 minutes and that was it on a 5000 60C battery, don't know how others were getting 3 minutes, flight times were no better when I tried it in the F-15.

[C17loadmaster]

I’m curious about the 9 blade too... I have a brand new one that I will put in one of my planes eventually. I bought the 8s version of the F-22 and the 6s unit if I prefer that

[DCORSAIR]

I don't use any mix on mine, sure others do but mine is fine with full flaps, I even pop the speed brake out on final and add a little power for the extra drag, the F-15 is one of the best ones on landings. I'm curious how the 9 blade works in yours, I tried it and it wasn't much better than stock so I went with the 4068-1680kv and that works very well. Let me know how it goes.

[RMatteson]

Just got a ARF Plus of the F-15 which I installed the new 9 blade FW fan from the F-4. I have watched the build and flight review, but they did not talk about elevator to flap mix. The F-16 needs up trim as nose pitches down with flaperons, and the F-4 needs up elevator as well. So what does the F-15 need when flaps are deployed ?? Thanks for input

[Flanker271]

This was tested in the plane. Not a true measurement since I only have acces to a kitchen scale and I only wanted to see what the fms put out. I’m going to try the original hp version fan. I’m just disappointed in the performance in this f15. She seems to drag it’s butt all day long, while my f14, l39, Avanti, 70mmf18, f16 move in a more authoritative way. If that makes sense.

A personal friend of mine was a Strike Eagle Weapons Systems Officer (sits on the back seat). He mentioned that aerodynamically, the F-15 airframe actually has the second worst energy retention in a turning fight out of all "teen-series" fighters. The reason the F-15 performs so well in combat is because of the two massively powerful F100 engines, which literally use brute force to achieve dominance in any AOA situations. We also talked about the MiG-25, which has similar aerodynamic configuration as the Eagle, and the maneuverability also sucks. It was quite an interesting conversation.