Originally Posted by Andy W

http://lmgtfy.com/?q=Turnigy+480L
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Andy,

Crack me up...... First time I have seen that.

Originally Posted by Red5

Do you have a link to this motor? Does it offer enough power to make things interesting?

don't know what that link is above. Looks like it took him more time to do that than actually give you the real link.

Here it is, don't know how interesting you want it, but it will run 4S on a 11x6 prop or 3S on a 13x7.


http://www.hobbycity.com/hobbyking/s...idProduct=9384

It's called "teach a man to fish"..

With my 3S 2200mah shoved all the way to the front of the battery tray, my Siren balances at 90mm from the leading edge of the wing. I don't think this is good!!!

When I tried the recommended 75-80mm it is very tail heavy. With this big of a difference in CG, adding nose weight is not an option. Just to take a picture of the plane on the balancer, I had to put a strand of 84g of lead on the front of the fuse. (balancer at 75mm on wing)

What should I try?

Thanks guys

How do you know it's tail heavy? Mine flies pretty good back farther

Read this thread. Several people put it at 85-90mm, some even 90-100mm.
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Game time!

These batteries will make up 40C-3000mah batteries up to 10S, but will really only be used for 4s, 5s, and 6s. Coupled with 6s and my ICE 100 Lite, it should be 2200W or near abouts, well within the limits of every component, which is a high-light to me!

Kid

Originally Posted by Thekid3418

well within the limits of every component

erm.. not exactly.

I can pretty much guarantee the airframe will not survive 2200W.
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Originally Posted by Andy W

erm.. not exactly.

I can pretty much guarantee the airframe will not survive 2200W.
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This may be true, Andy.

In which way are you concerned that the airframe will fail? As I have done in the past, the power will only be used for fast climbs, climbs no faster then the flat and level flight speed the airframe has already experienced. After the fast climb, the flight envelop will strictly be for smooth cruising, with the occassional roll

I completely agree that the airframe would likely fail if the power was used leading into a tight/abrupt turn or for a high-speed pass. But it will strictly be used in the vertical direction. Is there something I have been missing?

Originally Posted by nate 1001

How do you know it's tail heavy? Mine flies pretty good back farther

I guess I will try 90mm. It's amazing that that it is so far off the factory recommended CG. I have read this thread and it seemed that the furthest back I saw was 80mm.

The last thing I want is an extremely tail heavy plane, not on my first flight with at 2m wing.

Originally Posted by johnnyrocco123

I guess I will try 90mm. It's amazing that that it is so far off the factory recommended CG. I have read this thread and it seemed that the furthest back I saw was 80mm.

The last thing I want is an extremely tail heavy plane, not on my first flight with at 2m wing.

Johnny, why not wire up a parellel connector and throw another battery in there? It will only improve performance, and will help with making it more nose heavy, as long as you can keep it forward...

I would move it further forward then 90mm if this is your first big plane of this type.

Originally Posted by Thekid3418

Johnny, why not wire up a parellel connector and throw another battery in there? It will only improve performance, and will help with making it more nose heavy, as long as you can keep it forward...

I would move it further forward then 90mm if this is your first big plane of this type.

I would love to throw another battery in there but I don't have any room. I really didn't want to hammer out the tray. I dremeled it and widened it considerably. I suppose I could just dremel it right out of there. In that case I could throw in a 3300mah or maybe (2) 2200mah's.

Yes, first big wing. I have a small pylon and I used to have an easy Glider "rip off". This falls somewhere in the middle.

BTW, I still haven't built my sunracer, now that I am really comfortable with my VIP-1, I think I am ready. I can't get an answer to my question about the elevator, I am going to pm you

Originally Posted by Thekid3418

This may be true, Andy.

In which way are you concerned that the airframe will fail? As I have done in the past, the power will only be used for fast climbs, climbs no faster then the flat and level flight speed the airframe has already experienced. After the fast climb, the flight envelop will strictly be for smooth cruising, with the occassional roll

I completely agree that the airframe would likely fail if the power was used leading into a tight/abrupt turn or for a high-speed pass. But it will strictly be used in the vertical direction. Is there something I have been missing?

You will need a beefier firewall'''

The Siren won't exceed about 90 in a vertical dive. 2200W will (try to) pull it along at 150 or more. I don't think the Siren airframe can handle that speed, I don't think the wing will stay on the airframe, if it does, I don't think it will stay together for long.
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Originally Posted by Andy W

The Siren won't exceed about 90 in a vertical dive. 2200W will (try to) pull it along at 150 or more. I don't think the Siren airframe can handle that speed, I don't think the wing will stay on the airframe, if it does, I don't think it will stay together for long.
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This may be true, and time will tell. But this is why I got enough batteries for 5s also, so that 2200W can be eased into. By my figuring, I should be right around 8500 RPM if these batteries hold as high of voltage as I expect. That is only 1500 RPM higher then where I already am (1400W). I guess if things go wrong, you'll be able to throw a big "I told you so" in my direction

Flightmare,
I already have a new motor mount installed, but this one will have to be tapped out as well, as the bolt pattern won't match the P32. What I have planned is a 1/4" plate of G-10, milled part way through for the GB to nest in. This should offer all kinds of strength, as well as allow the spinner to line up flush with the nose of the plane

Kid