Official Freewing 90mm F-15C Eagle Thread

[Hugh Wiedman]

I took my F-15C Eagle out for its second test flight early this morning. Nice time to fly, cool, and light winds. I recently purchased a SMC 6S 5000 MaH battery that Hugh Wiedman had suggested I give a try, since my last flight with the Eagle was pretty doggy. I always fly my T-33 first as a weathership before taking up a more valuable plane like my F-18, F-4, F-15, or B-2 Spirit. I brought the new SMC battery with me, but didn't feel comfortable making its first flight in my new F-15, so I put it into the T-Bird to see how it went.

My thoughts were that performance improved with the SMC battery in the T Bird. I don't have empirical evidence to back that up, but it did seem to fly with more authority and at a lower power setting. It is also a bit smaller size than the comparable MRC Admiral batteries, so that was a good test of the battery before I put it in one of my other jets.

I used a pretty new Admiral 6S 5000 MaH battery for my second flight of the F-15. I have installed a new 12 blade fan and the stock inrunner motor that is currently sold with F-15 kits. I do have a little extra weight with the JP Brakes and wheels and a simulated afterburner in the tail.

Takeoff was normal when I started near the approach end of the runway for a full run at our approximately 500 foot long runway. Still, it took up much of the runway to take off. The whole flight was better than the first with the outrunner motor and 9-blade fan I had on the first flight, but still, I'd have to say "pretty doggy." (My field elevation is 5,000 feet MSL.)

Next flight I will use the new SMC battery to see if that helps its "dogginess" a bit. It's still a fun plane to fly, but even my T-33 totally outclasses it in performance at this time.

Interested in how the F15 performs with the SMC. Good luck!

[davegee]

Interested in how the F15 performs with the SMC. Good luck!

Hi Hugh: I just got back from the field. I have flown the SMC battery on my T-33 yesterday, and one flight on my F-15C this morning. I started near the very beginning of the runway and went to full power for takeoff right away. It accelerated pretty well, and sorta lifted off by itself with plenty of runway to spare. Once I got the gear up, the plane still seemed to be a bit "doggy" and I didn't try any maneuvers except for a bunch of passes at about 80 percent power. It still definitely lags behind planes I have like the F-18 and the T-33. I did have an issue with the right gear wheel hanging up on the wheel well (these are 60mm wheels and electric brakes) so it was less than perfect aerodynamics for the flight. I think probably the biggest issue I have is the altitude that I fly at, and the Density Altitude, which makes it worse. I only fly in the early mornings when the air is smooth and it is relatively cool. If I was flying at sea level, I would bet the performance would be much better. But I can live with what I have flying at my home field.

It still comes around nicely for landing in a high-alpha pitch attitude perfect for landing. Brakes work great and there was no damage to the plane on its 3rd flight.

I like what I've seen with the SMC batteries, and think I'll order at least one more of these for further evaluation. It is a bit smaller, slightly heavier than the Admiral batteries on my scale, but with the tight space of a plane like the F-15 for batteries, anything smaller is good, and I think the performance is probably better than the Admirals. I also like the pricing, too!

Thanks for recommending these batteries. I could see slowly transitioning to these over the Admirals down the road.

Happy flying!

Cheers

Davegee

[shortround91]

Just got to speed test my new 90 F15 today she’s all stock exception FW twin burner, running SMC hivlt 53-4600 packs getting 3-4 min flights. She’s so forgiving to fly not as fast as my J-10 but not bad either

[shortround91]

Another successful day flying the F15 not a scratch seems like 106 is all she’s gonna get other than steep dives. Super happy with this plane even more forgiving than the J-10 on grass, gets a little hard to see up there but what a amazing sound it has

[Icarus the 2nd]

[Coconut]

Is that 6 or 8S? What modifications was done besides the paint scheme?

[Reptielenfreak]

4075 is 8s i think

[Evan D]

It is 8S, the current 8S that FW is putting in their 90's, F-22, J10, Zeus, Eurofighter, etc.

If you click on the youtube link it has more info.

"Nice new scheme on pilot's Uwe Freewing F-15. He upgraded this model recently with the newest Freewing 90mm 4075-1350kv 12 blade EDF power system running on 8S lipos. Enjoy the vid which had the best parts of 2 flights."

[shortround91]

Swapped the F15 to tailerons the other day a few flights have gains etc worked out super dialed in. She still fells like it is lacking thrust on our grass field, ordered a set of inserts for the exhaust outlets. Hoping they help sweet flying plane very stable forgiving other than the thrust, anyone has more thoughts on a way to improve please post something like to fly her more had one launch I could even rotate yesterday

[shortround91]

Just upgraded the 90 F15 to 8s I made a set of exhaust reducing nozzles which made an amazing improvement over stock 6s. Not sure if anyone else has gone 8s also and should I make another reducer set with slightly larger outlets

[Shaun Evans]

Hi,

I wonder if anyone can please tell me the center-to-center distance between the tailcones on this bird? Thanks!

[shortround91]

On my 90 center will be 35mm measured from the inner cone

[Shaun Evans]

On my 90 center will be 35mm measured from the inner cone

I meant the distance from the center of one cone to the center of the other cone. But I got the measurement I needed. Thanks!

[shortround91]

Sorry about that

[Shaun Evans]

JL conversion pipe for the F-18 works perfectly for this!

[Shaun Evans]

JL conversion pipe for the F-18 works perfectly for this!

[shortround91]

Wow that looks nice I made my own this would have been much nicer. I used a PCV pipe joiner opened up to 55mm exit worked best for me on 6s, haven’t flown her on 8s yet sure I will try some different sizes

[Evan D]

His is a turbine conversion

[shortround91]

Ah my club allows them but for me to get certified is a 3 1/2 hour ride each way. Maybe some day

[Reptielenfreak]

Honing for an update version of the 90mm since everything is sold out..