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Old Jan 07, 2013, 12:47 AM
You can't take the sky from me
scott page's Avatar
United States, WA, Richland
Joined May 2009
4,586 Posts
Zephyr actually likes a bit of a breeze better than not. Makes launching easier, and it doesn't mess with it once up to speed. But definitely - always launch into the wind.

If you can program a switch to add 20 - 30% up for launch it's really helps.. then flip it off once the plane is upto speed.
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Old Jan 07, 2013, 05:49 AM
Registered User
Leeds/Bradford Leeds, Great Britain (UK)
Joined Jun 2003
1,490 Posts
Bit of a slope behind our house so i think i will try that, Thanks
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Old Jan 07, 2013, 06:16 AM
ancora imparo
jj604's Avatar
Melbourne, Australia
Joined Jul 2005
5,665 Posts
It loves a bungie launch ramp as well.

Throttle up as it leaves the end of the ramp.

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Originally Posted by glenbees View Post
Bit of a slope behind our house so i think i will try that, Thanks
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Old Jan 08, 2013, 12:23 PM
You can't take the sky from me
scott page's Avatar
United States, WA, Richland
Joined May 2009
4,586 Posts
Quote:
Originally Posted by jj604 View Post
It loves a bungie launch ramp as well.

Throttle up as it leaves the end of the ramp.
Would you be able to post photos of this ramp? I'm not sure what my minds eye imagines is anything like what you are doing.
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Old Jan 08, 2013, 01:18 PM
ancora imparo
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Melbourne, Australia
Joined Jul 2005
5,665 Posts
Sure. Will try and find some time later today or tomorrow to do some pix.
Quote:
Originally Posted by scott page View Post
Would you be able to post photos of this ramp? I'm not sure what my minds eye imagines is anything like what you are doing.
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Old Jan 09, 2013, 07:30 PM
ancora imparo
jj604's Avatar
Melbourne, Australia
Joined Jul 2005
5,665 Posts
Launch ramp for Zephyr

OK here you go. Sorry they are just pix taken at the side of the house but you will get the idea.

It is based on the many ramp ideas around but I wanted one that:
1) Was as compact as possible to go in the car.
2) I could fly from at the club if necessary without having to be on the runway to launch.

So I eliminated the big release board you normally push with your foot and replaced it with a servo operated catch made from a door hinge. I just bound a second cheap Orange Rx to my DX8 and plugged the servo into the gear channel.
Whole thing is on a small board anchored to the ground with two plastic tent pegs.

The bungie is HobbyKing blue bungie plus about 3x the length of 30lb fishing line. Anchored into the ground with a doggie training stake. The bungie ring hooks over the metal catch bolted to the door hinge with a 1m (3ft) length of extension line to a second ring that hooks on a towhook made from a HK wing skid. A skid on each wing near the servo plus the tow hook keep the whole thing a bit off the ground at touchdown and seems to help with the wing mount destroying twist you can get if one wing hits flat on. I started off with a long bungie but am about to try it with 3.5 m (yards) of rubber and 15 m of line which I think will be fine and quicker to set up.

The ramp itself is the usual plumbing pipe and push fits together at the field.

Takes about 30 sec to assemble and a bit longer to lay out and tension the bungie.

Check everything works, spool up enough to make sure the fan is running and reduce any throttle lag at launch but not move the plane and hit the retract switch. Launches smoothly and with authority and I throttle up to full power after it leaves the ramp.

If I can fly off one of these things, anyone can.

Only change I am going to make is drill a single hole for one tent peg so you can rotate the release mechanism easily into the wind if the direction shifts.
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Last edited by jj604; Jan 09, 2013 at 07:36 PM.
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Old Jan 10, 2013, 01:03 PM
You can't take the sky from me
scott page's Avatar
United States, WA, Richland
Joined May 2009
4,586 Posts
Quote:
Originally Posted by jj604 View Post
OK here you go. Sorry they are just pix taken at the side of the house but you will get the idea.

It is based on the many ramp ideas around but I wanted one that:
1) Was as compact as possible to go in the car.
2) I could fly from at the club if necessary without having to be on the runway to launch.

So I eliminated the big release board you normally push with your foot and replaced it with a servo operated catch made from a door hinge. I just bound a second cheap Orange Rx to my DX8 and plugged the servo into the gear channel.
Whole thing is on a small board anchored to the ground with two plastic tent pegs.

The bungie is HobbyKing blue bungie plus about 3x the length of 30lb fishing line. Anchored into the ground with a doggie training stake. The bungie ring hooks over the metal catch bolted to the door hinge with a 1m (3ft) length of extension line to a second ring that hooks on a towhook made from a HK wing skid. A skid on each wing near the servo plus the tow hook keep the whole thing a bit off the ground at touchdown and seems to help with the wing mount destroying twist you can get if one wing hits flat on. I started off with a long bungie but am about to try it with 3.5 m (yards) of rubber and 15 m of line which I think will be fine and quicker to set up.

The ramp itself is the usual plumbing pipe and push fits together at the field.

Takes about 30 sec to assemble and a bit longer to lay out and tension the bungie.

Check everything works, spool up enough to make sure the fan is running and reduce any throttle lag at launch but not move the plane and hit the retract switch. Launches smoothly and with authority and I throttle up to full power after it leaves the ramp.

If I can fly off one of these things, anyone can.

Only change I am going to make is drill a single hole for one tent peg so you can rotate the release mechanism easily into the wind if the direction shifts.
So If I understand this crude drawing is how this all is hooked up??
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Old Jan 10, 2013, 03:33 PM
ancora imparo
jj604's Avatar
Melbourne, Australia
Joined Jul 2005
5,665 Posts
Scott that would work but I prefer to have the release up near the plane where I can adjust everything. Mine's set up like this.

John
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Old Jan 10, 2013, 07:18 PM
You can't take the sky from me
scott page's Avatar
United States, WA, Richland
Joined May 2009
4,586 Posts
Quote:
Originally Posted by jj604 View Post
Scott that would work but I prefer to have the release up near the plane where I can adjust everything. Mine's set up like this.

John
O cool. Awesome. I've a little project to do. Thanks.
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Old Jan 11, 2013, 09:48 AM
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Disarray's Avatar
United States, GA, Gray
Joined Apr 2007
871 Posts
How is the slow speed performance? With the 4000 mah battery and crusing in a racetrack pattern at a slow speed, no thermals or gliding, what kind of flight time could I expect?

A buddy and I fly in formation with pusher wings right now but we are getting tons of prop strikes. We are usually 10' off the deck and fly as slow as we can. Thinking a ducted fan would cut down on the prop strikes. Does this plane sound like it might fit the bill?
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Old Jan 11, 2013, 09:55 AM
An Aussie in Chicago
Joined Apr 2012
1,144 Posts
Quote:
Originally Posted by Disarray View Post
How is the slow speed performance? With the 4000 mah battery and crusing in a racetrack pattern at a slow speed, no thermals or gliding, what kind of flight time could I expect?

A buddy and I fly in formation with pusher wings right now but we are getting tons of prop strikes. We are usually 10' off the deck and fly as slow as we can. Thinking a ducted fan would cut down on the prop strikes. Does this plane sound like it might fit the bill?
I wouldn't think this would be suitable. Long low wings, delay in spool up with the fan propulsion.
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Old Jan 11, 2013, 03:41 PM
You can't take the sky from me
scott page's Avatar
United States, WA, Richland
Joined May 2009
4,586 Posts
Quote:
Originally Posted by Disarray View Post
How is the slow speed performance? With the 4000 mah battery and crusing in a racetrack pattern at a slow speed, no thermals or gliding, what kind of flight time could I expect?

A buddy and I fly in formation with pusher wings right now but we are getting tons of prop strikes. We are usually 10' off the deck and fly as slow as we can. Thinking a ducted fan would cut down on the prop strikes. Does this plane sound like it might fit the bill?
I did a touch and go about 80mph once, actually just drug a wingtip for about 20' right in front of me and crapped my pants.

But slow flight -- this is NOT the animal.
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Old Jan 11, 2013, 06:55 PM
ancora imparo
jj604's Avatar
Melbourne, Australia
Joined Jul 2005
5,665 Posts
Scott if you want to make a ramp here's a little table I made up for designing the launch angle. Mine is about 7 degrees.

For a particular desired angle in the first column you multiply the length of the ramp by the factor to give you how much higher the front uprights have to be than the back ones.

For example for a 10 degree angle if your ramp was 4 feet long the front legs need to be 4 x 0.17 =0.68 ft = 8inches longer than the back ones


5..........0.09
7.5.......0.13
10........0.17
12.5.....0.22
15........0.26

John
Quote:
Originally Posted by scott page View Post
O cool. Awesome. I've a little project to do. Thanks.
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Old Jan 12, 2013, 12:42 AM
You can't take the sky from me
scott page's Avatar
United States, WA, Richland
Joined May 2009
4,586 Posts
Quote:
Originally Posted by jj604 View Post
Scott if you want to make a ramp here's a little table I made up for designing the launch angle. Mine is about 7 degrees.

For a particular desired angle in the first column you multiply the length of the ramp by the factor to give you how much higher the front uprights have to be than the back ones.

For example for a 10 degree angle if your ramp was 4 feet long the front legs need to be 4 x 0.17 =0.68 ft = 8inches longer than the back ones


5..........0.09
7.5.......0.13
10........0.17
12.5.....0.22
15........0.26

John
Thanks. Awesome.
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Old Jan 13, 2013, 11:01 AM
Crash Specialist
bmclaughlin's Avatar
Near Dallas
Joined Mar 2009
20 Posts
Quote:
Originally Posted by jj604 View Post
OK here you go. Sorry they are just pix taken at the side of the house but you will get the idea.

It is based on the many ramp ideas around but I wanted one that:
1) Was as compact as possible to go in the car.
2) I could fly from at the club if necessary without having to be on the runway to launch.

So I eliminated the big release board you normally push with your foot and replaced it with a servo operated catch made from a door hinge. I just bound a second cheap Orange Rx to my DX8 and plugged the servo into the gear channel.
Whole thing is on a small board anchored to the ground with two plastic tent pegs.

The bungie is HobbyKing blue bungie plus about 3x the length of 30lb fishing line. Anchored into the ground with a doggie training stake. The bungie ring hooks over the metal catch bolted to the door hinge with a 1m (3ft) length of extension line to a second ring that hooks on a towhook made from a HK wing skid. A skid on each wing near the servo plus the tow hook keep the whole thing a bit off the ground at touchdown and seems to help with the wing mount destroying twist you can get if one wing hits flat on. I started off with a long bungie but am about to try it with 3.5 m (yards) of rubber and 15 m of line which I think will be fine and quicker to set up.

The ramp itself is the usual plumbing pipe and push fits together at the field.

Takes about 30 sec to assemble and a bit longer to lay out and tension the bungie.

Check everything works, spool up enough to make sure the fan is running and reduce any throttle lag at launch but not move the plane and hit the retract switch. Launches smoothly and with authority and I throttle up to full power after it leaves the ramp.

If I can fly off one of these things, anyone can.

Only change I am going to make is drill a single hole for one tent peg so you can rotate the release mechanism easily into the wind if the direction shifts.
Thanks for the idea and pics.

I've got one about to maiden..... as soon as travel and crappy weather allow me a day to get out.....

Never bungeed anything before. How far do you stretch the darn thing??
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Last edited by bmclaughlin; Jan 13, 2013 at 02:02 PM.
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