Folks seem to really like the umph available from the FW 4068-1835 6s, but one characteristic seems to pop up in everyone's take on it, and that is shorter flight times due to its thirsty nature. The FMS setups, in my experience increase thrust and efficiency resulting in longer flights. Too me, flight duration is just as important from a performance standpoint as power.
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I upgraded my FW F-4 right out of the box when I built her, due to the lack luster performance I experienced with my FW 90mm F-16 in stock trim. So I cannot compare the stock version with the re-powered FMS version. I just know that the F-4 also came in an 8s option and to me that's a red flag telling me that the 6s will probably have anemic performance. At the time I upgraded, the FW 90mm 4068-1835 6s was out of stock, already having the FMS 80mm in my F-86 and being very happy with both the additional thrust and flight time endurance I naturally grabbed the 90mm FMS. This was the second upgrade for my 90mm F-16 as I'd previously used the 8s 90mm setup from FW to give her more pep. I didn't care for her heavier flight characteristics and decreased vertical as an 8s bird, which motivated me to upgrade yet again for the FMS 90MM 6s setup. Was so happy with the results, I put the same setup in my F-4 right out of the box.
Folks seem to really like the umph available from the FW 4068-1835 6s, but one characteristic seems to pop up in everyone's take on it, and that is shorter flight times due to its thirsty nature. The FMS setups, in my experience increase thrust and efficiency resulting in longer flights. Too me, flight duration is just as important from a performance standpoint as power. -
You're probably right, I saw those stats as well but I already had the Freewing in my F-16 and was more than happy with it so that's what I put in the F-18's and F-4's. Better to dance with the devil I knew rather than the devil I didn't. And I was fairly confident I wouldn't know the difference with the FMS fans and an extra 2.5% of thrust anyway. Rarely at full throttle except at take-off. I will say the FMS fans I put in the SU-30 were outstanding and completely transformed that bird from the gerbil wheels it came with, so convinced their fans are more than up to the task as well. Either one will put the F-4 "over the top".Leave a comment:
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That's what I am running in my current F4...nothing wrong with it at all but the two 70mm FMS fans REALLY outclassed the Dr Mad Thrust fans I changed out in the SU 35
Hugh I'm looking at the stats for the FMS and it might have the edge on the Freewing...... 1850kv --- to 1835 kv 4000gm thrust to 3900gm thrust........
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I put the 12 blade inrunner in both my F-4's that originally came with that 1650 Kv outrunner. The increased performance was outstanding and as much as I enjoyed it with the outrunners, it flies awesome with that 12 blade inrunner. Unlimited vertical and gives me over 4 minutes on an SMC 6200. Take off on grass is less than 70 feet. IMO, well worth the upgrade despite the hefty price. I've installed the 12 blade inrunner in both my F-18's and F-16 as well as it's now my EDF of choice.
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I will be upgrading my older F-4 that has the 90mm Outrunner with the Freewing 4068-1835 Inrunner 12 Blade within the next couple of weeks. It is on my "to do list." Out of all of my EDF's, my F-4 is my favorite Jet. Some of the reviews on the Motion website have been very good regarding this upgrade.Leave a comment:
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Anyone running an FMS 90mm 12 blade in their F4? I like the 70mm ones I put in my SU 35 so might try one in the new F4 if anyone has good things to say about them !!
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Hi Locharrow, Glad she’s going again.
If you do experience a loss of control event in the future, the chokes might be a consideration for any follow-on bird with a high-current ESC.
-GGLeave a comment:
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GG... just have a wee choke round the ESC - Rx lead.
I put a deep V cut along the crack in the wing, roughed it out and filled it with dry brown rice mixed with 1/2 hr epoxy, tamped mix into the V, let it dry, sanded, coat of fine filler paste,sanded again and primed. Works a treat....Didn't paint it as might re-do the whole plane. Flew it again this afternoon ...no problems at all. I'm beginning to think there was fairly stiff turbulent breeze above the trees in the park even although it appeared fairly calm at ground level.
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Are you using RF Chokes? The time I had an A-10 and F-4 do this, I added chokes to the next/new replacements. Since I added chokes, no more loss of control issues.Nose gear was holding up OK...... till this afternoon!
Fresh cut grass, no dogs or footballers so good to go. Got up, gear up, flaps up, gyro on...all the auto take off things done. I noticed the plane tipping on way then the other which in calm conditions ain't good. I then felt the plane slow to react to input so decided to do a circuit and come in but there was no way it was willing to do what it was told so I did a down wind dump while I had the chance. Bent nose gear pin, doors bust and cracked wing where the mains leg took the brunt of the dump. Fortunately all fixable but it makes powering up the new one more and more appealing !!! 
Search on RF chokes or chokes and read the posts.
-GGLeave a comment:
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Nose gear was holding up OK...... till this afternoon! Fresh cut grass, no dogs or footballers so good to go. Got up, gear up, flaps up, gyro on...all the auto take off things done. I noticed the plane tipping on way then the other which in calm conditions ain't good. I then felt the plane slow to react to input so decided to do a circuit and come in but there was no way it was willing to do what it was told so I did a down wind dump while I had the chance. Bent nose gear pin, doors bust and cracked wing where the mains leg took the brunt of the dump. Fortunately all fixable but it makes powering up the new one more and more appealing !!!
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All points taken but the superglue pad I put on the running bar switch tag has worked great and is still going strong. Time will tell. Went out today but dog "instructor" with sucker clients in tow screwed it up !!
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Good deal…my concerns are:
Lead is soft and may deform and allow the play to return. And, super glue easily fractures.
Might eventually need to use a different metal and a flexible adhesive like foam tac or Gorilla glue.
-GGLeave a comment:
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The play was caused by a gap between the fulcrum and the running bar flat top. Not having a solder gun I tried hammering a strip of lead really thin and cut it roughly to the size of the running bar flat top and super glued it on. I trimmed it to the bar shape and did a few up and down tests. Had to trim it again as it sounded very painful but after another wee shave or two it worked great.
Have it installed and it's rock solid. !! The weather is still great so it's all good to go !
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Locharrow, use a soldering gun vs iron. I was happily surprised how nicely the fulcrum wetted with solder. Use a washer type that also wets well.
Nice to have an understanding spouse! Get her something special, too.
-GGLeave a comment:
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Thanks GG. I didn't think that fulcrum would solder but I'll give it a try. I had one unit where the travelling bar went too far and allowed the fulcrum to slip. I built up a superglue pad on the wee tag that hits the switch to stop it earlier and that. fixed it.
Shredded the nose of the SU35 yesterday in trees ...pure pilot error .. ..new fuselage needed....wife encouraged me to buy it 
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Assuming the play is fore/aft play along the retract axis…you can disassemble the retract servo and remove the large silver rotating part. Then solder a thin washer to the side that hits the plastic body when in the gear down position. This thin washer will fill the gap and the play will be greatly reduced or eliminated. Use a washer that has the diameter of the width of the rotating body.
Reassemble the unit and check for proper operation.
-GGLeave a comment:
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Out with the beast or/and the SU35 every day this week, some days two sessions. Unbelievable flying weather, very calm, light cloud with an odd light shower but not the blinding sunny days like last week. Fulcrum in the nose gear unit seems to have a fair bit of play after the pummelling of the hard pitted grass surface...any easy fixes or is it a new servoless retract unit ???
Temptation is getting the better of me, moved the new F4 from the spare room to the dining room table ...........
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Those are the best kind, a warrior with experience still capable of going back into battle. Mine fly best the more epoxy they have and the more times it's been fixed after "mishaps". Trees are there for alternate runways. Just "fixed once" means it's virtually brand new! The aircraft I have problems flying are those that have never been repaired and are in "pristine" condition, they make me way too nervous. Fortunately, I have very few of those left in my hangar.
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Your further back than me Hugh, I came forward of 195mm because of the sensitive stab. I had a problem with wing rocking on nose high landing approaches but the gyro fixed that. I also removed a large section of the fan cover, framed it with 1/8th balsa strip and laid in a fine mesh grill to get air into the fan.
I'm thinking about retiring the beast as it has been up trees, landed in bushes and just plain crashed and fixed once. I have a new one in the spare bedroom that I look at and drool . Problems problems .................
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