NotFastEnuf E011 / Bwhoop Silverware Fork


#1165

It’s not far off, in fact, you’re right - I can’t tell a noticeable difference between the two.


#1166

what’s it for ? #define FPV_ON CHAN_ON


#1167

You can control the FPV camera (on and off) with the use of a FET through your TX


#1168

cool, thanks


#1169

Hi everyone

I’ve having a problem with the quad kinda resetting when doing some acro moves. As you can see from the video upon exiting the building dive, the quad seems to reset and drop abit before I’m able to recover. This has happen with my B03 Whoop as well as my latest build with BetaFPV Lite and fresh 17,500kv motors. They both are flashed with the latest NFE fork. Most things are standard and I’ve selected Super Strong Filtering. What can be wrong?


#1170

You have flown into your prop wash and the props have no clean air to grip so it drops a bit without control. Change the way you exit the dive, full throttle while still facing straight down then pull back on the stick to level out, that way you should be moving through cleaner air.


#1171

Nailed it. It’s so deceptive how well silverware flies that it’s easy to forget it’s just a tiny whoop. You have what … an overhead of 30 or 40 grams of thrust to play with beyond the weight of the craft… divided out over 4 motors is only 10g of thrust per corner. Now factor in thrust imbalances that need to be corrected and you lose even more … now your down to 8 that you can actually use. Each motor has to fight the moment of inertia of the whole whoop before it can make an orientation correction. So there goes even more headroom. Now to make it worse we take that prop and put it behind a giant windscreen (duct) and send it towards the ground in a dive … and ask it to grab air from outside of the windscreen. It has to overcome the low pressure within the duct to create thrust leaving the duct. But it’s worse yet… the duct itself has its own leveling effect crated as soon as we start moving air into it that is proportional to the amount of air we suck into the duct. We don’t want to level out unless we command that control … so now we are fighting another thrust imbalance and losing more available power. Finally at the end of our dive we turn our entire propeller system into a parachute suddenly exposing the props that were hidden behind the windscreen to an onrush of air blowing into them in a direction that wants to stop them from spinning as we suddenly change our orientation to pull out. WHAT A DISASTER! Our expectation on less than 10 grams of useable thrust headroom per corner to handle all these forces and influence a 30 gram craft is somewhat unreasonable. So it requires a bit of piloting :wink: As @Chaotix said… always dive at beyond 90 degrees to the ground … so air is always blowing into the prop and not against it. Then smoothly apply close to full throttle while still facing down. This gets the props spinning nicely with good bite … then slowly pull out … trying to gradually introduce our thrust efflux to the inrush of air towards the underside of the duct as we cross back over that 90 degree mark and windscreen is “removed”.

Here is a more practical example… one day while playing around I added a line of code to blink the led any time a motor hit 100% command. Cause if it does … there’s nothing left right … Then I flew. When do you think it started blinking?

Answer: The moment I leaned forward on the sticks to leave a static hover and it just kept blinking as I flew around. So in reality EVERYTHING we do other than hover standing still is exceeding the physical limitations of the system. I was devastated to see this. My inner engineer screamed out in pain begging me to walk away! Lol


#1172

This actually all leads to the next big break through that we need to make in firmware for whoops…the fundamental difference between silverware and betaflight… and how I believe the answer is in in some smart algorithms that sort of blend the two of them together… but before I write a dissertation on that … I’ll wait to see if anyone wants to engage in that discussion. :slight_smile:


#1173

Of course we do, lol.

What madness are you planning?!?


#1174

@Chaotix Thanks man! I’m such a novice pilot that I thought all quad should fly more or less the same!

@NotFastEnuf Awesome stuff! No one has ever written such a long and detailed explanation to a problem I had! It’s really amazing that a sub 30 grams craft to be able to do something like it does! I need to train myself to be a better pilot.