DIY ultralight, Retro biplane style, twinprop

The propellors to airplane ratio behaves curiously like hubmotor to wheel diameter ratio. At first, I doubted the propellers weren't sized appropriately until he gunned the throttle to 75%. :lol:

If for some reason, she won't fly, it should be a simple swap out of one or more of the battery, controller, motor, propellor variables. :wink:

But why wood vs. a lightweight metal :?: Will it withstand the test of time? Or maybe, it's a prototype proof of concept build? :idea:
 
He doesn't have enough power with those engines stock wind.

The same ones were used a while back on a Lazair ultralight and they were marginal even after being rewound for more power. The Lazair is a really light aircraft with a huge wing area so it has very low power requirements.

It is an interesting read.

https://www.rcgroups.com/forums/showthread.php?1412424-100-scale-Electric-Lazair
 
helno said:
He doesn't have enough power with those engines stock wind.

The same ones were used a while back on a Lazair ultralight and they were marginal even after being rewound for more power. The Lazair is a really light aircraft with a huge wing area so it has very low power requirements.

It is an interesting read.

https://www.rcgroups.com/forums/showthread.php?1412424-100-scale-Electric-Lazair

He actually did a quick test the other night and live streamed it on youtube. He was able to successfully take off and fly briefly, but I think he mentioned it was underpowered and he was going to add more motors (or something). He also had a pretty rough landing and damaged the fiberglass on the nose of the plane. He took the video down mostly likely because he did the test after sunset which is illegal for ultralights.
 
It flies! So far, he's using non lethal heights of 15-20 feet. It also steers, as he ran out of runway and had to turn back to find his home field. :lol: His battery's capacity really isn't enough to get anywhere. Not only will he need to increase his battery capacity, but will probably need to change to a more powerful engine setup as well.

What's funny is that battery could probably give my Ebike 50+ miles vs. his ~1 mile trial flight. But the plane wins the "best view" award for sure. :p

[youtube]N6CS-YJ3_VU[/youtube]
 
Motors & propellers are the same. Added more batteries. He flies it higher & longer. Checks battery capacity after the flight. Informs viewers about ultralight protocol/regulation. I'm sure I've missed some other key points. :mrgreen:

[youtube]eNSN6qet1kE[/youtube]
 
It will be interesting to see his in flight power measurements once he adds the instrumentation.
 
Nice !!!!

I think i have a new DIY project 8)


Greetings Martin
 
I like this guy too.

I hope this biplane story here is not true...second wing gives only 20% more lift ?


https://www.youtube.com/watch?v=0P0K9BSuQqE
 
topspeed said:
I like this guy too.
I hope this biplane story here is not true...second wing gives only 20% more lift ?
https://www.youtube.com/watch?v=0P0K9BSuQqE

Interesting video @topspeed.

Do you know where all the e-fly people in this forum have moved to? This place seems pretty dormant?

Stay safe,
SolarSail
 
Solarsail said:
topspeed said:
I like this guy too.
I hope this biplane story here is not true...second wing gives only 20% more lift ?
https://www.youtube.com/watch?v=0P0K9BSuQqE

Interesting video @topspeed.

Do you know where all the e-fly people in this forum have moved to? This place seems pretty dormant?

Stay safe,
SolarSail

I have no idea...I wonder if the drone infection has taken most of them.
 
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