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Jul 04, 2019, 12:40 PM
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Gregertman's Avatar
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I just got off the phone with my friend Tom. His 85 extra (the one I weighed and posted up here) is powered with the EME 60 a falcon 23X9 prop (spinning to 7200 rpm on the ground in 90 deg heat) He has the EF carbon spinner For control he used some servos he had laying around (hitec 7955s in the tail and MKS 777 ailerons) He was bieng weight conscious so he left off the wheel pants and landing gear cuffs. He also used the wheels and axles from the 74 slick instead of the 85 extra ones. The 74 slick wheels are 1.5 oz lighter each. His all up weight with two 2550 pulse receiver batteries and a 9310 powersafe rec. and a full 17 oz fuel tank is 16 lbs even.
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Jul 04, 2019, 12:59 PM
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Dennis C's Avatar
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Originally Posted by YellowJacketsRC
Dennis, You correct that I did not include some of those things. Some of the numbers I used came from AP's lists, so its a guess. Chris' came in at 16 Lbs so it's likely mine will too. I did include the silicone spacers for the pipe support. But you mentioned Zip Ties. Is that for the Pipe? or just for the random things we might use them for?

I ask because I am a little concerned with my pipe braces. I had to make my own by copying the stock ones, only I had to make the center hole smaller to fit my pipe. So the pipe does fit perfectly inside the braces and up against the silicone spacers. BUT it is not tight inside them. In fact there is little pressure against the pipe from the spacers. Will this be an issue?

I am done measuring though. On with the build!
I am sorry I should have put a smillie at the end of my post, I think that we are getting a little pickie and that this will fly absolutely fantastic with any of the recommended components gas or electric. Maybe not so much with a Da 70 and a 32oz tank or heavy HK 7000 Ma Graphine packs

There are some excellent 5000 Mah pack's that are 76 grams lighter/pack than the one's listed by AP, that alone would be a saving of 156 grams for a 12s system.

Dennis
Jul 04, 2019, 04:28 PM
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YellowJacketsRC's Avatar
Ah. Thanks Dennis!

Very valid points
Jul 05, 2019, 08:53 AM
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Aeroplayin's Avatar
Quote:
Originally Posted by YellowJacketsRC
Ah. Thanks Dennis!

Very valid points
Dennis is correct about the main battery pack weight. I went back to look at some the best light batteries I've owned and by going with 12S 45C 5000mAh Glaciers, you can drop almost 0.4 pounds in the 50cc electric powered version. 17.05 lbs.

DA-50L with stock exhaust = 16.31 lbs
Xpwr40 with 4400mAh = 16.58 lbs
DA-50L with a pipe = 16.76 lbs
DM5335 with 5000mAh = 17.05 lbs

16.3 lbs gas and 17 lbs electric for a 50cc plane is the lightest in 'modern ARF era' where the fuse is long and wide. so there is never going to be an issue with how it flies, if you like light and powerful planes. I thought I had the lightest 50cc ten years ago when I had a kit-built to under 18 lbs wet. The problem was that it was almost 19 pounds with all the electric power gear that was available then to get only 4500W.
Jul 05, 2019, 09:03 AM
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Aeroplayin's Avatar
I just found the weights for the plane I mentioned above. Like I said, I thought it was the lightest 50cc around at the time. It has a 85.5" wingspan and a fuse length of only 76" and the empty airplane weighs 10.78 lbs. So the EF 85 Extra is a full pound lighter than what I thought was the lightest 50cc around and it has a much longer, and probably wider, fuse.
Jul 05, 2019, 10:59 AM
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YellowJacketsRC's Avatar
I am just excited to get mine in the air!

Slow going though. I am SUPER busy at work and little time to mess with it. Every time I DO I realize I am missing something. I am now waiting on some 7" Bolts to mount the motor, and a new RX. I reckon I am going to attempt to fly with HS7955s. But will prolly be buying new servos soon.
Last edited by YellowJacketsRC; Jul 05, 2019 at 06:19 PM.
Jul 05, 2019, 02:41 PM
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YellowJacketsRC's Avatar
If you had to chose between using a Savox 1270 on rudder, and MKS 777A+ on ailerons, or the other way around, which would you do?
Jul 05, 2019, 02:45 PM
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dhooks6's Avatar
Quote:
Originally Posted by YellowJacketsRC
I am just excited to get mine in the air!

Slow going though. I am SUPER busy at work and little time to mess with it. Every time I DO I realize I am missing something. I am now waiting on some 7" Bolts to mount the motor, and a new RX. I reckon I am going to attempt to fly with HS7995s. But will prolly be buying new servos soon.

Why not just run them on hv, 7.4 an be done with it. Hitec will tell you it's perfectly safe,and bumps you to around 400 oz
Jul 05, 2019, 02:47 PM
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dhooks6's Avatar
Quote:
Originally Posted by YellowJacketsRC
If you had to chose between using a Savox 1270 on rudder, and MKS 777A+ on ailerons, or the other way around, which would you do?
Either probably works, possibly look more towards if you need more or less weight in the tail to balance the plane,. Or is a pull pull setup?
Jul 05, 2019, 02:47 PM
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Dennis C's Avatar
Did you mean 7955 servos?

Run them on 2s lipo or 8 volts and they will be perfect.

Dennis
Last edited by Dennis C; Jul 05, 2019 at 02:55 PM.
Jul 05, 2019, 02:49 PM
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YellowJacketsRC's Avatar
Quote:
Originally Posted by Dennis C
Sport flying and non aggressive flight on low rates and they will work.

With high throws and speed you will get blow back, snaps will be hard to stop on point, don't dirt flirt, you may not have room for recovery.

anxiously awaiting for some flight reports and new video from Extreme Flight.

Dennis
Which ones? Both? Neither are sufficient for rudder or ailerons?

What is sufficient?

I AM running HV BTW
Jul 05, 2019, 02:57 PM
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Sideslip's Avatar
I would have to believe that the MKS 777A+ would be fine on aileron or rudder. Just look at the torque numbers = 561 oz-in @ 8.4V. And the speed isn't all that bad. They are a touch heavier, but not that bad. I'd be inclined to run them on everything, and probably will if I end up buying an 85.
Jul 05, 2019, 03:06 PM
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Aeroplayin's Avatar
As long as the 777A+ are more reliable than the 777 and are really 75g, they may be a really good option. The 1270's are really 65g and very reliable but not quite as strong at 7.4v as the A+. But cheaper and lighter and I'm not sure what kind of torque we'll need on this plane. What's the aileron area? We can calculate it quickly.

In spite of the fact that I just trashed the 777's, I have two new ones I'd sell for $80 shipped if you're interested. They are 86g though.
Jul 05, 2019, 03:49 PM
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YellowJacketsRC's Avatar
36" Long
5.5" from hinge to TE at Root
5.25" Hinge to TE at Tip
Jul 05, 2019, 03:58 PM
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YellowJacketsRC's Avatar
Who here knows about tuned pipe install?


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