I thought about selling my 70 a few times, but cant let it go... flies so damn smooth.

Originally Posted by Vapor Trails

I thought about selling my 70 a few times, but cant let it go... flies so damn smooth.

I hear you. It is really a fantastic flying airplane. I only have about ten flights on mine but I am loving every moment of it!!

Originally Posted by Nixus

I hear you. It is really a fantastic flying airplane. I only have about ten flights on mine but I am loving every moment of it!!

Did you say "Loving every minute of it"?

https://video.search.yahoo.com/yhs/s...3&action=click

Don't get me wrong. I love my 70" Extra. I'm only thinking about it because a friend convinced me that I will love the 78" even more. I can't keep both because I don't have room to store it, so I figured I would explore my options.

Also, my other two planes use 6S 5000mah packs. If I make the 78" a 12S plane, I can use the same packs for all my planes to make my life easier.

Originally Posted by gobigdave

Don't get me wrong. I love my 70" Extra. I'm only thinking about it because a friend convinced me that I will love the 78" even more. I can't keep both because I don't have room to store it, so I figured I would explore my options.

Also, my other two planes use 6S 5000mah packs. If I make the 78" a 12S plane, I can use the same packs for all my planes to make my life easier.

Do you think 5000mAh might be a little big for the 78" Extra? Looks like 3700mAh are recommended, although Ben says that he uses 4400mAh on the 78". Seems like 5000mAh would be better suited to the 60cc planes:

XPWR 40CC applications:

The 40CC is intended for the 78" Extra at around 14+ lbs and the 79" Slick at about 15+ pounds. I have one in a 78" MXS and it's outstanding (you can see it ripping out of hover in the video) but totally excessive. Fun, though. In the Extra it provides power for the kind of big, roaring upline maneuvers the plane wants to do. Fly this one on a 21x10 or 22x10 prop, whatever gets you a little over 4000 watts. For me, that's a 21x10 most days, and 12S 4400mah packs. That gives me 4300 watts for about 300 watts/pound in the MXS. On the Slick I swap back and forth between 12S 4400 and 12S 5000 on a 22x10. This gives about 4500W or, again, close to 300 watts/pound, but propping down to a 21x8 or 21x10 doesn't give up much, and is still about 280 watts/pound, and I do this on hot days. For the 78" MXS and Extra, order our BlazingStar standoff kit. The 40CC with a 22x8 or 22x10 also works well for the lighter class of 50CC airplanes, like the classic 3DHobbyShop 87" Extra 300 SHP. 4500 watts gives about 250 watts per pound on a plane like this. Plenty. Much more than we used to have back on the day when we thought 3000 watts was "killer" on a 50CC plane. Heh. Use a 120 amp ESC minimum on the 40CC.

XPWR 60CC applications:

Big 50-60CC planes or 70CC planes. All the extreme flight 88-91" planes. We fly this on 12S 5000-6000mah with 24" props 9-10-12" pitch. Whatever prop it takes for your setup to have about 6000 watts is good. You have about 300 watts per pound to play with, and as you can see in the video, it tosses the big 91" Yak around like nothing. Use a 160 amp ESC, nothing less. BlazingStar standoff kit is on the way.

Originally Posted by wkener2

Do you think 5000mAh might be a little big for the 78" Extra? Looks like 3700mAh are recommended, although Ben says that he uses 4400mAh on the 78". Seems like 5000mAh would be better suited to the 60cc planes:

XPWR 40CC applications:

The 40CC is intended for the 78" Extra at around 14+ lbs and the 79" Slick at about 15+ pounds. I have one in a 78" MXS and it's outstanding (you can see it ripping out of hover in the video) but totally excessive. Fun, though. In the Extra it provides power for the kind of big, roaring upline maneuvers the plane wants to do. Fly this one on a 21x10 or 22x10 prop, whatever gets you a little over 4000 watts. For me, that's a 21x10 most days, and 12S 4400mah packs. That gives me 4300 watts for about 300 watts/pound in the MXS. On the Slick I swap back and forth between 12S 4400 and 12S 5000 on a 22x10. This gives about 4500W or, again, close to 300 watts/pound, but propping down to a 21x8 or 21x10 doesn't give up much, and is still about 280 watts/pound, and I do this on hot days. For the 78" MXS and Extra, order our BlazingStar standoff kit. The 40CC with a 22x8 or 22x10 also works well for the lighter class of 50CC airplanes, like the classic 3DHobbyShop 87" Extra 300 SHP. 4500 watts gives about 250 watts per pound on a plane like this. Plenty. Much more than we used to have back on the day when we thought 3000 watts was "killer" on a 50CC plane. Heh. Use a 120 amp ESC minimum on the 40CC.

XPWR 60CC applications:

Big 50-60CC planes or 70CC planes. All the extreme flight 88-91" planes. We fly this on 12S 5000-6000mah with 24" props 9-10-12" pitch. Whatever prop it takes for your setup to have about 6000 watts is good. You have about 300 watts per pound to play with, and as you can see in the video, it tosses the big 91" Yak around like nothing. Use a 160 amp ESC, nothing less. BlazingStar standoff kit is on the way.

I use 5000 mah in my 78 Extra V2 with the Xpwr 40cc and for me they are perfect.

And there's your answer

now that my 74 is flying, i went ahead and put the 70Extra back on the bench to get swapped over into the Horus. the extra will get my first Horus flights....

im finally ditching 6s in favor of an 8s setup, and was curious what size props you all are putting on your 8s ships. guidancd is appreciated!

My 8S Motrofly ~300kv swings a 19x10. Plenty of power/speed and with 5000mah packs, I easily get 7+ minutes of mixed flight time. The 19x10 is the same prop I was using when I was 6S, but a rewind of the motor plus 8S completely changed this airplane. It's so much better on 8S. I wish I hadn't waited so long to convert.

How many watts are you pushing out?

I metered my tired asss old 6s batts and could not sustain 1000w.
I want to go 8s for now, but I am really tempted to put in the xpower 30cc when I have the funds.

I am really tempted to put in the xpower 30cc when I have the funds.

Yes.

It won't even compare to this tired and rusty ole axi5325/16...

It's been a while since I put the watt meter on, but I recall around 75amps with charged packs. That's in the 2400W range. FYI, this is a Motrofly 4325 wound to ~300kv.

My 6S packs were getting killed trying to get 90+ amps out, and things were getting weak towards the end of any flight.

Crashed my Extra today... dual elevator servo failure about four minutes into flight (running 5245Mg's). Went to pull out of a knife edge spin and the plane moved so that it was pointing straight down, and went down into the grass.

If anyone has a fuselage you want to sell PM me

OR

If anyone is interested in a set of wings, SFG's, or elevators let me know

Some pictures for your enjoyment: