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Flea style "Piojo Flying MiniBike"

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FritzW

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If you wanted to stick with just two-axis then a split wing gives that with a single control system. Plus, it gives an easy way to fold the wing just by unhooking the outer struts since the wing is already in two halves.
How do you plan to fold the wings without a center section? How would disconnecting the split wing pivot bearing be simpler than the standard flea wing fold.


Rear wing ailerons only make sense if you make them elevons and have the fore wing be fixed.
Why would making the front wing fixed and putting elevons on the rear wing be better?

The idea behind the Piojo is a simple 3 axis flea. I think the best way to approach that is to just make a standard 2 axis flea and give it ailerons. The simplest and safest way to do that is to put them on the rear wing.
 

Sockmonkey

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How do you plan to fold the wings without a center section? How would disconnecting the split wing pivot bearing be simpler than the standard flea wing fold.

Why would making the front wing fixed and putting elevons on the rear wing be better?

The idea behind the Piojo is a simple 3 axis flea. I think the best way to approach that is to just make a standard 2 axis flea and give it ailerons. The simplest and safest way to do that is to put them on the rear wing.
Make the center bearing a universal joint and you don't have to disconnect it to fold the wings back.
I don't think a fixed front wing with rear elevons would be better.
If you want elevons, put them on the front wing and you don't need to tilt the wing at all.
 

erkki67

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But if the fwd wing shall be a elevons the a mixer aka Horten would make most sense to me, with the control tubes going as vertical as only possible towards the attachment link to the wing.

Then there would be no controls outside the fuselage width.
 

erkki67

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Fritz, how about the possibility to build the Piojo in elements, the wings in 3 pieces and the fuselage in 2 pieces?

The idea is to build it in a flat, in a city somewhere in 4th or more floor flat.

And if the fuselage could be split for transport, the trailer would get shorter too?!

The Airbike was delivered with a spit fuselage, but this was to reduce shipping costs.
 
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Tiger Tim

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Since we were talking a page or two ago about the need for constant back pressure on the stick of all but the very last Fleas (for some reason), is there a compelling reason you can’t just stick a trim tab on the forward wing to fly hands-free?
 

FritzW

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Let's see if the forum lets you quote from a different thread...
It depends on the rigging and the airfoil used, it is certainly possible to use a fixed tab to dial out that pressure at cruising speed. I think it is safer and better to do that so that when you let go of the stick...nothing happens.
Matthew said a few posts later that bungee cords were the typical way to trim out the back pressure. I think either one would work fine as long as it was cockpit controllable.

...adjustable trim tabs on the wing might keep the stick forces lighter (you wouldn't have to work against the bungees)
 

Sockmonkey

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Ease of disassembly was one of the reasons I advocated the split wing.
Having no moving bits aft of the pilot means the aft wing can just be slid onto the fuselage tube, held in place with a pin. If the control stick and pushrods are attached to the nose structure rather than the fuselage tube itself, then the tube can be likewise removed from that, and you wouldn't even need to remove the fore wing from it.

 

Victor Bravo

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^^^^^^^
See, now that's genuinely clever. That disassembly/transport/storage goal makes it worth looking into some of the exotic control hookup stuff that has been iscussed.

Now you're talking about a much smaller trailer, or storing it in a one-car garage, etc.

If you're using a square tube for the main fuselage like that, maybe drill more than one hole for each major wing or nose section attach location, so you can balance the aircraft for a wider range of pilots without adding or removing ballast.
 

Sockmonkey

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^^^^^^^
See, now that's genuinely clever. That disassembly/transport/storage goal makes it worth looking into some of the exotic control hookup stuff that has been discussed.

Now you're talking about a much smaller trailer, or storing it in a one-car garage, etc.

If you're using a square tube for the main fuselage like that, maybe drill more than one hole for each major wing or nose section attach location, so you can balance the aircraft for a wider range of pilots without adding or removing ballast.
Thanks. I probably should have posted that bit earlier.
 

FritzW

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There's some good footage of a flea being towed by a scooter starting at about 30:00 ...and my favorite scene at 31:44 of a guy pumping gas with a cigarette hanging out of his mouth ;)

You could almost modify the scooter to mount the wings. You could fold them for towing, unfold them for flying or detach them for running around town. ...hummm, I wonder if there's a scooter model on grabcad

 

Sockmonkey

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There's some good footage of a flea being towed by a scooter starting at about 30:00 ...and my favorite scene at 31:44 of a guy pumping gas with a cigarette hanging out of his mouth ;)

You could almost modify the scooter to mount the wings. You could fold them for towing, unfold them for flying or detach them for running around town. ...hummm, I wonder if there's a scooter model on grabcad
Probably wouldn't be too hard to mount flea wings on a recumbent motorcycle, and tow the wings folded up when driving like that one flying car did. Might actually be a viable roadable design.

To Sketchup! WOOOOOSH!

And there we go.
 
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