DHC-4 Caribou | 73" Span

[Pieliker96]

Well we've got a verdict! It was indeed stalling the outboard section of the left wing even when (as a pilot) it didn't feel like it should be! Due to the propwash, the flow over the wing root can remain fully attached even when the massive flaps are down and the entire outboard section is stalled - the wing fences seem to prevent the stall from spreading, just in the opposite direction of intended. My solution was to add VGs to the outboard sections. They do disturb the air more in cruise and therefore cause more drag, but they do a great job at mixing the boundary layer and making the stall delayed and much more mushy - the stall tendency is quite manageable now, and it wants to drop a wing considerably less.

The VGs do sacrifice some of the scale accuracy, but it's worth it to make it flyable.


Paint scheme and wheelbarrow attempts coming soon!

 

[SSgt Duramax]

Well we've got a verdict! It was indeed stalling the outboard section of the left wing even when (as a pilot) it didn't feel like it should be! Due to the propwash, the flow over the wing root can remain fully attached even when the massive flaps are down and the entire outboard section is stalled - the wing fences seem to prevent the stall from spreading, just in the opposite direction of intended. My solution was to add VGs to the outboard sections. They do disturb the air more in cruise and therefore cause more drag, but they do a great job at mixing the boundary layer and making the stall delayed and much more mushy - the stall tendency is quite manageable now, and it wants to drop a wing considerably less.

The VGs do sacrifice some of the scale accuracy, but it's worth it to make it flyable.
View attachment 224296 View attachment 224297

Paint scheme and wheelbarrow attempts coming soon!

Nice! If you have a 3D printer, and want some better looking VGs, there are a couple of designs on thingiverse I have tested that worked.

 

[Pieliker96]

A bit later than "soon", but we've got paint and some successful wheelbarrow attempts!

I do plan on bringing this rig to Flite Fest - and, if I have some extra time, entering it into the Bush Plane Challenge!

 

[FlyerInStyle]

View attachment 226693

View attachment 226694 View attachment 226695 View attachment 226696 View attachment 226697 View attachment 226698

A bit later than "soon", but we've got paint and some successful wheelbarrow attempts!

I do plan on bringing this rig to Flite Fest - and, if I have some extra time, entering it into the Bush Plane Challenge!

Wow! cant wait to see it at flitefest!

 

[L Edge]

Did you ever explore reversing the ESC and how did you deal with the looong!!!!!! time element to go into reverse. multi engine?

 

[Pieliker96]

Did you ever explore reversing the ESC and how did you deal with the looong!!!!!! time element to go into reverse. multi engine?

I've messed with it on the ground, not much in the air. Reason being is that if I enable reversing, the left motor likes to cut out at random - the plane handles engine-outs surprisingly well though. It does take a bit to switch but if you're on it and flying ahead of the airplane during landing it should be possible to real-quick jam it into reverse and decrease the landing distance.

 

[FishbonesAir]

Wow... that's impressive 👏

 

[Jonny Gum]

This looks amazing. I might be interested in making a larger version with twin monster radials. Just an idea.