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Old Apr 13, 2010, 02:02 PM
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United States, KY, Prospect
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Andy,

Crack me up...... First time I have seen that.
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Old Apr 13, 2010, 02:23 PM
You down with EPP?
johnnyrocco123's Avatar
Houston, Tx
Joined May 2009
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Originally Posted by Red5 View Post
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
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Old Apr 13, 2010, 05:07 PM
RIP Ric
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Marietta, GA
Joined Jun 1999
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It's called "teach a man to fish"..
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Old Apr 18, 2010, 07:15 PM
You down with EPP?
johnnyrocco123's Avatar
Houston, Tx
Joined May 2009
6,780 Posts
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
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Old Apr 18, 2010, 08:00 PM
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PA
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How do you know it's tail heavy? Mine flies pretty good back farther
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Old Apr 18, 2010, 08:12 PM
RIP Ric
Andy W's Avatar
Marietta, GA
Joined Jun 1999
43,312 Posts
Read this thread. Several people put it at 85-90mm, some even 90-100mm.
..a
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Old Apr 18, 2010, 08:29 PM
The Kid
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Detroit, MI
Joined Dec 2007
2,585 Posts
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
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Old Apr 18, 2010, 08:34 PM
RIP Ric
Andy W's Avatar
Marietta, GA
Joined Jun 1999
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well within the limits of every component
erm.. not exactly.

I can pretty much guarantee the airframe will not survive 2200W.
..a
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Old Apr 18, 2010, 08:59 PM
The Kid
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Detroit, MI
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Originally Posted by Andy W View Post
erm.. not exactly.

I can pretty much guarantee the airframe will not survive 2200W.
..a
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?
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Old Apr 18, 2010, 09:19 PM
You down with EPP?
johnnyrocco123's Avatar
Houston, Tx
Joined May 2009
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Originally Posted by nate 1001 View Post
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.
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Old Apr 18, 2010, 09:42 PM
The Kid
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Detroit, MI
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Originally Posted by johnnyrocco123 View Post
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.
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Old Apr 18, 2010, 10:04 PM
You down with EPP?
johnnyrocco123's Avatar
Houston, Tx
Joined May 2009
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Quote:
Originally Posted by Thekid3418 View Post
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
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Old Apr 19, 2010, 01:35 AM
The frigin Catalina wine mixer
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USA, CA, Buena Park
Joined Oct 2006
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Quote:
Originally Posted by Thekid3418 View Post
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'''
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Old Apr 19, 2010, 06:53 AM
RIP Ric
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Marietta, GA
Joined Jun 1999
43,312 Posts
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.
..a
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Old Apr 19, 2010, 08:54 AM
The Kid
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Detroit, MI
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Originally Posted by Andy W View Post
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.
..a
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
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