FlyFly F-86 build

thehaze · January 29, 2013, 08:51:07 PM

Looks fantastic!

flying saucer · January 29, 2013, 10:42:13 PM

Nice job on the install, you're right, that looks like a beast of an ESC. Probably won't even break a sweat

Wingnutz · January 30, 2013, 11:48:54 PM

Thanks for the encouragement guys. The RCGroups gang tell me I have to cut the nose of the fuse back a bit before I mount this nose cone to get a scale look. I kinda think they're right but I haven't got that brave yet.
Re-painted the nose cone with the correct gold...looks better and insulated and installed the motor lead extensions. Double shrink wrapped and wrapped the connections with electrician's tape as there'll be 100A ish through these and they sit pretty close together, running in a channel above the fan.
Do thrust tubes need to be glued in? This one fits really snugly and there's no way you can move it by simply pulling on it.

Wingnutz · February 01, 2013, 05:55:16 PM

Ran the motor (6S)very briefly...not as much as I'd expected. It did blow the plans stuck on the wall all over the basement!
Max A - 83.8
Max Watts - 1647
Min V under load - 19.2
Max RPM 27-28,000
This was obviously a static test so I dunno if the fan was stalled and drawing fewer amps or the batteries sagged too much under load. Everything I'd read said to expect 100A...didn't happen according to the data log. Still the early FlyFly F-86's flew well with 5S and 1200W so maybe it'll be enough.

sihinch · February 01, 2013, 05:58:34 PM

What's that, about 80A and 1700W, Bill?

Wingnutz · February 01, 2013, 06:15:34 PM

Simon,
You're quick! Hadn't even finished the initial post and you'd asked about Watts and Amps! Re-posted with the readings from my logged data.

sihinch · February 01, 2013, 06:57:16 PM

Like you said re: FlyRC review on the Hunter, that also flew on 5S, so I think we should be OK on 6S with the better fans we're using.

Ededge2002 · February 01, 2013, 07:25:26 PM

Warm packs should yield higher voltage under load. If your going to give it a shot again warm the packs to about 80degrees and I bet there is improvement. It takes quite some time to get big packs up to temperature. As the voltage climbs so will the amps remember.

Wingnutz · February 01, 2013, 09:55:04 PM

Thanks Ed,
My batteries have been sitting in my unfinished basement and it's pretty cool down there. I'll charge them and warm them and try again.

flying saucer · February 01, 2013, 10:00:46 PM

Bill, looking at the specs of your fan you should be closer to 2200watts and 97 amps peak with a fully charged battery. I believe RC Lander use a power supply set at 22Volts for their testing. This is roughly equivalent to a good 45C 5000mah pack under load. Either way the 19.2 you are seeing is far too low at just 3.2volts per cell. Are you sure the battery was fully topped up?

Wingnutz · February 03, 2013, 06:27:16 PM

I originally thought this would be a one week project...it's an ARF for crying out loud! It's almost two years and although I worked on the model again this weekend, to look at it you'd swear it's gone backwards!

Decided to go for the more scale look of the Air Sally nose cone and the shortening of the nose entailed in that choice... usually this means cutting one inch off the front of the fuse and covering the surgery with the new cone...
Nope...if I cut this much off, the area of fuse where I'm mounting the retract plate would be cut in half...so, sand, sand, sand!
Along the way I decided to re-design the retract mount to give it a lower profile...nothing's ever simple!
I'm glad jets day is not this month!
Will re-try the motor test when my basement warms up!

Michael · February 03, 2013, 08:17:08 PM

That's an amazing job on the nose retract!

Very impressive!

Ededge2002 · February 03, 2013, 10:44:11 PM

Bill there is one at the lake in Trenton if you get out that way. Its static mounted on a pillar. I have some pictures of it but I don't know where they are right now. Just some inspiration for all your hard work.

http://www.google.ca/search?q=f86+trenton&hl=en&tbo=d&source=lnms&tbm=isch&sa=X&ei=oy0PUaf8GejJ0wGrnoD4Dg&ved=0CAcQ_AUoAQ&biw=360&bih=515&sei=qC0PUavHLYeB0AGviIGAAw

Wingnutz · February 04, 2013, 10:57:35 AM

Thanks Ed,
That's one of the best groupings of Golden Hawk Sabre photos I've seen. The shot from behind with flaps and air brakes deployed has got me thinking! A couple of the guys over on RC Groups have already done it but their photos weren't as inspiring!

Wingnutz · February 23, 2013, 12:21:47 AM

Been busy with other projects but managed to get a few hours in on the Sabre. Finished the nose job...shortening the nose so that the aftermarket nose cone wouldn't look way too long and then filling, sanding and painting...filling, sanding and painting...
Photos show the nose before and after the Park Flyer nose cone was replaced with the Air Sally nose cone. Never used the FlyFly nose as it really didn't capture the character of the real aircraft.
Epoxied the nose retract mount into the model and as the work on the fuse is nearly done, couldn't resist applying one of the graphics Callie did for the model.