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Old Nov 15, 2011, 07:08 PM
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United States, CA, Santa Cruz
Joined May 2011
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Your Bipe looks really nice, did you do a kerf cut on the inside of the foam to get your fuse bend?
I had some problems getting the right prop for that Jumbo plane. The motor is suppose to be a 1700kv and I did try the reccomended size for the motor but it just didnt have enough thrust to fly the plane. The motor is a
EMP Outrunner BL Motor N3530/07 1700KV
EMP N Series Motor and calls for a 7*6 or 8*4 with a 3 cell.
I ended up with a 10*6 prop and my batt was bad thats why I had very short flights. I used my 1600 batt. with a 30amp esc and get 6 min flights. Which is Great!! But
I'm still confused about the motor it's really big but a high kv. Should I use a higher amp esc for more kv And then use the 7*6 or 8*4?
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Old Nov 15, 2011, 07:15 PM
ɹǝsn pǝɹǝʇsıƃǝɹ - inverted!
DaDesign's Avatar
USA, SC, Greer
Joined Jul 2008
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This plane is so kool! I'm going to have to build one.

Send me the measurements and I'll draft a set of plans.

I like the red and white paint scheme.

I'm not sure on your question so we'll let the other guys answer that one.
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Old Nov 15, 2011, 07:23 PM
ɹǝsn pǝɹǝʇsıƃǝɹ - inverted!
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This guy really fly's his model!!!!!

http://www.youtube.com/watch?feature...v=L75ESD9PBOw#!
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Old Nov 15, 2011, 07:25 PM
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Joined May 2011
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Thanks Dalton ,Ill get the numbers together and send them to you.
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Old Nov 15, 2011, 07:32 PM
ɹǝsn pǝɹǝʇsıƃǝɹ - inverted!
DaDesign's Avatar
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Quote:
Originally Posted by Bluefish11 View Post
Thanks Dalton ,Ill get the numbers together and send them to you.
Thanks Blue
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Old Nov 15, 2011, 07:34 PM
ɹǝsn pǝɹǝʇsıƃǝɹ - inverted!
DaDesign's Avatar
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The video above was about three video's in front of this one but this is amazing!

http://www.wimp.com/steamengine/
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Old Nov 15, 2011, 11:19 PM
ExPat
Aero Andy's Avatar
Spain, Murcia, Mazarrón
Joined Apr 2010
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Hi Bluefish
You've got a stunning looking Bipe there, I agree with Dalton, I love the red and white paint scheme. Thanks for posting the pictures.

Hey Topdawg, are you anywhere near finishing yours yet? Looking forward to seeing it

Andy
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Old Nov 16, 2011, 05:38 AM
Gravity gets me down.
helicow's Avatar
USA, FL, Brooksville
Joined Jan 2008
1,393 Posts
Quote:
Originally Posted by Bluefish11 View Post
Your Bipe looks really nice, did you do a kerf cut on the inside of the foam to get your fuse bend?
I had some problems getting the right prop for that Jumbo plane. The motor is suppose to be a 1700kv and I did try the reccomended size for the motor but it just didnt have enough thrust to fly the plane. The motor is a
EMP Outrunner BL Motor N3530/07 1700KV
EMP N Series Motor and calls for a 7*6 or 8*4 with a 3 cell.
I ended up with a 10*6 prop and my batt was bad thats why I had very short flights. I used my 1600 batt. with a 30amp esc and get 6 min flights. Which is Great!! But
I'm still confused about the motor it's really big but a high kv. Should I use a higher amp esc for more kv And then use the 7*6 or 8*4?
I will give it a shot here.

Here are the numbers for your motor. From what I have seen, the higher the kv, the smaller the prop. These guys are commending a 40amp ESC. It would appear teh motor can handle up to 30amp. If this is the case, then the 40amp ESC is "just to be sure". A good 30amp ESC should allow bursts for short periods, but I would have to go with 40amp.
EMP N Series Motor
Include Spare shaft & Back Mount Prop Adapter.
A:Prop 7x6,Lipo 3S,40A ESC@1kg Current:30A
B:Prop 8x4,Lipo 3S,40A ESC@1.5kg Current:36A
If you use a larger prop, you really need to measure the amps being used. This would be a good way to smoke your equipment. Get a watt meter to be safe, else use the recommended stuff.

I did find another site that says a 30amp ESC, but they recommend a 7x4 or 6x6 prop. I like consistency of this....

The point being here, your 10x6 prop is way too large for this motor and this will draw much higher amps, unknown without measurements, which leads to smoked equipment, puffed lipos.

I am not good at determining the correct motor prop, but it has to do a lot with the weight of your plane. The EAs I have built all used daRecommended motor and prop. Has worked flawlessly for me.

So, you could weigh your plane (with out motor) and that could be compared to Dalton's specs.

Hope it helps - about the best I can offer. Without a watt meter, you are "flying blind".....
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Old Nov 16, 2011, 05:53 AM
BANG IT!!!
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United States, PA, Bellefonte
Joined Dec 2007
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Quote:
Originally Posted by helicow View Post
I So, you could weigh your plane (with out motor) and that could be compared to Dalton's specs.

Hope it helps - about the best I can offer. Without a watt meter, you are "flying blind".....
Some basic outlines to go by

Trainer, slow and safe. 75 watts per lb
Sport, trainer with attitude 100 watts per lb
off the hook 3D performance 150 watts per lb

The math
If you are running a
3 Cell Lipo which is classified as 11.1 volts
The motor you have is classified as 30 amp
in this case a 7x6 prop
volts X amps = watts
11.1 X 30 = 333 WATTS which is 3D for a 2 lb plane

2 Cell Lipo
7.4 X 30 = 222 Watts
In this case you can step up to a 8X4 prop
This could be a slow trainer plane up to 3 lbs.

Suggested props are touchy. Depending on the brand and style of prop, you mileage may vary. Slofly type typically pull more amps then the knife blade style. Higher Cell count, smaller prop. A WATT meter is your friend on these things.
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Old Nov 16, 2011, 07:09 PM
ɹǝsn pǝɹǝʇsıƃǝɹ - inverted!
DaDesign's Avatar
USA, SC, Greer
Joined Jul 2008
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Quote:
Originally Posted by Aero Andy View Post
Hi Bluefish
You've got a stunning looking Bipe there, I agree with Dalton, I love the red and white paint scheme. Thanks for posting the pictures.

Hey Topdawg, are you anywhere near finishing yours yet? Looking forward to seeing it

Andy
Bob and Ron,
Thanks for da info. I learn somethin' myself!

Andy,
I enjoyed my visit to your blog. You have a nice hanger full of great planes!
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Old Nov 16, 2011, 11:48 PM
ExPat
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Spain, Murcia, Mazarrón
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Quote:
Originally Posted by DaDesign View Post
Bob and Ron,
Thanks for da info. I learn somethin' myself!

Andy,
I enjoyed my visit to your blog. You have a nice hanger full of great planes!
I appreciate that, thanks Dalton. Your Bipe is next on my list, which is why I'm soaking up all this info from your thread, you can never know too much..
I only build with epp though, so I'm hoping your design will adapt with the help of some extra carbon.
all the best
Andy
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Old Nov 17, 2011, 07:05 AM
ɹǝsn pǝɹǝʇsıƃǝɹ - inverted!
DaDesign's Avatar
USA, SC, Greer
Joined Jul 2008
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Quote:
Originally Posted by Aero Andy View Post
I appreciate that, thanks Dalton. Your Bipe is next on my list, which is why I'm soaking up all this info from your thread, you can never know too much..
I only build with epp though, so I'm hoping your design will adapt with the help of some extra carbon.
all the best
Andy
EPP will make the bipe even better! The lighter the better.
I can't wait to see it.
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Old Nov 17, 2011, 07:42 AM
Gravity gets me down.
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USA, FL, Brooksville
Joined Jan 2008
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I have been thinking about adding balsa/ply support to fuses. Kind of how SkyWing does it

Picture here.
http://www.rcgroups.com/forums/attac...mentid=3986000

I could take my dremal and "mill" (assume that is what the process is called) the balsa/ply by hand, but I would bet that would get real ugly very quickly.

Just curious if anyone has any ideas or have seen tools/equipment that do this? Not looking to start a factory, but come to think of it....

Anyways, adding this type of support to an EPP EA may be fun and a good thing.

Any thoughts?

Bob
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Old Nov 17, 2011, 07:51 AM
RC Toys R 4 White Trash
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Joined Dec 2008
4,090 Posts
I have experimented with that and it wasn't good. This is coming soon...http://www2.ocn.ne.jp/~tonbo/airframespec.html

R/C Airplane model Park Flight 2 (4 min 52 sec)
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Old Nov 17, 2011, 07:51 AM
Gravity gets me down.
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USA, FL, Brooksville
Joined Jan 2008
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Dalton (or anyone that can answer this) - I was curious, what is the process you go through to increase the size of one you your models? I do not think I could just "scale" the printing, especially if it were tiled.

But is it basically just increasing everything by the same percentage to get a larger version or is there more to it than that?

I ask, because I found some plans for a EPP Slick, really like the slick, that I would like to make larger - like 42".

Any thoughts?

Bob
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