This video has so many fantastic features that I don't even know how to begin praising them individually. But here it goes, anyway...
Your SIL is just amazing. The craftsmanship alone is off the scale, but the enhancements you added (like the field stripping) are simply ingenious. The looks are stunning too - I mean, you even DECORATED it!
Bringing THE Joe Gibbs in is a major and unexpected excitement! He is no doubts one of the most competent guys on the planet, when it comes to shooting authentic war bows. We are all just lowly amateurs in comparison. To see him shoot the SIL more than twice as fast as a regular bow, that blows me away. What does NOT surprise me is the fact that to him, the 120 lbs bow felt like a 160 lbs with the SIL attached. The man spent many years building up the muscle set required to draw a bow out the conventional way, and now the motion is a bit different. It is as clear as day that he would have to get used to this first. I am pretty sure he would very soon not feel much difference anymore. Friction is NOT the issue, the SIL maybe adds 5 lbs of a draw weight due to friction - it does not matter if you draw it out empty or under load.
Your "Attack of the Joe Clones" part is a one-of-a-kind, first-ever, mind boggling masterpiece of editing. It is absolutely terrifying to watch. You get an idea how effective a whole battalion of SIL equipped archers would have been. Amazing. 800 archers, shooting 4000 arrows in 8 seconds? At least 2000 of those arrows would be in the air at the same time. Imagine how it would have been to be on the receiving end of that attack. Wow. Some say that in the battle of Crecy, the English had 14,000 archers... 70,000 arrows in five seconds. Archery warfare on steroids.
Because of these features (I am sure I forgot to mention some anyway), I officially declare this video to be the BEST INSTANT LEGOLAS VIDEO ever. I do not say such things lightly. Congratulations!
For me, the absolute best part was when you said the SIL may inspire people to think about medieval history. My little invention, having THAT effect on people? I have no words to describe how proud you just made me.
I could go on and on, but sorry, I now have to watch the video again. And again :)

"I hope I haven't bored you with another Instant Legolas film"
Please, we come from Joerg's channel. We have these about as often as warm dinners.

14:55 I honestly think the reason he get's tired so quickly is the speed, normally the time between each shot is more which means he get's to rest a bit between each shot, but when he shoots this fast he has virtually no time to rest, it's like comparing sprinting to distance running, one you burn all your energy to get a burst of speed but the other is sustained output.

What a wonderful cooperation of a true German inventor,  a true English bowmaker and a true English bowman.

As Joe was mentioning at 13:00, from a body mechanics standpoint, having the rear handle be horizontal considerably lessens the effectiveness of the short head of the biceps brachii. I wouldn't be surprised if that had a big effect on Joe's draw. It also prevents the brachialis muscle from being recruited. That would have a smaller effect, but not negligible. If we say the current orientation is at 0 degrees and vertical would be 90 degrees, I think about 60 degrees would be the ideal orientation from a body mechanics perspective.
Were the bone runners lubricated? A little oil might help a lot.
As far as the handle on the front, perhaps putting it on a hinge so that it folds away most of the time. Defending a siege or something, that handle could be very useful if you're waiting for a chance to send an arrow at someone who's popping in and out of cover, but you probably wouldn't want it all the time.
Fantastic stuff, cheers!

Listening to 5 of those things is terrifying imagine your charging a position and you hear a hundred or so of those things open up.

NO THANK YOU

I laugh a loud when Tod's say let me show you its features and then i suddenly hear jörg laugher... Haha

this is what's possible when people share ideas without ego attachments. bravo! so cool to see two passionate engineers/designers collaborate and improve on an already amazing idea

that intro got me, at first glance I thought you'd made five!

imagine using an instant legolas on a static frame like a balista holding it, with two people.
its basically a machine bow right there

Absolute Mad Lad

Edit: That group of 5 Joe Gibbs loosing 25 arrows in 10 seconds is terrifying.

Always a joy to see Joe shoot, whatever he is shooting.

JoergSprave is pretty damn brilliant. He doesn't only build weapons, but he invents new designs as well. Good to see that this community is acknowledging each other, and Joerg is one of my favorites in this community. I'm a big fan of his.

12:12 This is clearly because of his hand placement. It’s 5cm back from where it would normally be, giving him less leverage over the last (and most difficult) bit of the draw. Friction has a small role to play but I think it’s primarily his different physiological positioning around the bow, as mentioned.

Joe did just move a total of 3000lbs in a short period of time. That can't be easy. What a beast!

Upvote for that Joerg laughter <3

He was tired because he was trying to shoot rapidly. There's little recovery time compared to shooting a regular bow. Over the course of 5 shots, you'd start to feel it.

That edit of the “five” men shooting together is exactly what makes me think this thing would be terrifying and absolutely would have had a place in history. You wouldn’t put this in your best bowman’s hands — you get a horde of strong peasants capable of raining Hell on the enemy. BLOCK OUT THE SUN!

That Laugh overdub tho

When the five "Joes" were standing and shooting next to each other, it reminded me strongly of Age of Empires lol :D