Equipment – Powered Paragliding. A most Personal form of Flight

Flights 1163 & 1164 Throggle Test

It was a beautiful day for a test flight. Yesterday Troy, “The Krazy Kracker“ and I installed Robert Kittila’s Throggle. A throttle that has the brake toggle fixed to the body of the throttle body allowing the pilot to start the engine after he has the risers in hand ready to launch. Visually it’s a work of art. A black matte handle contoured to fit the hand with a groove cut for the brake toggle. The start, kill button and throttle/cruise control are molded into the top so that all the controls are within reach of the thumb. The cruise control is an aluminum tab that is easy to adjust and engage.

The first flight was cut short when I noticed a line tangle right after lift off but everything worked as advertised. The second launch was also a short flight but it allowed me to test the throttle.

I hope Robert finds a market for the throggle but it’s not me. After a very short flight I found a couple of things that were show stoppers. Probably the biggest is that it’s not easy to clip the throggle to the risers and I’m not sure they would stay attached in every situation. I like to park the brakes and give my arms a rest. Theoretically, with the throggle you set the cruise control and park the brakes but that doesn’t work for me because even when I’m out of the brakes I like to have control of the RPMs. It’s cumbersome to keep reaching over to adjust the cruise tab especially when it’s attached to the magnets. Incidentally the cable is too long and it looked like if it came off the magnet, it could easily be sucked into the prop. So …. I stopped testing parked brakes right there.

One issue was during the launch. I like to have my hands on the A lines during inflation. It’s possible to hook the #1 A with the thumb and control the throttle but once the wing is up, the A needs to be released and the thumb lever also gets released when that happens. So… for a moment the thrust is reduced. On a hard surface, like this morning, it was no big deal because the cart had very little drag but on grass the cart would slow immediately causing the wing to surge, forcing me to brake at a low speed to keep the wing overhead. It would delay the launch and add unnecessary complexity. The A assists can do the job without me being in the A’s but I like to feel the wing during those crucial seconds.

The thumb throttle control works fine but the spring tension had to be reduced to accommodate the short lever weaker thumb. I can imagine that without using the cruise control the thumb could get pretty tired.

Another problem was the way we wired into the motor. The starter can be engaged at any time whether the key is in or not. It can be tapped during a flight or perhaps while we’re standing around in the garage. It would be much better if it only engaged when the key was turned to run. That can be fixed if I change my opinion and decide to continue with this throttle. As it is, I’m going to have to rig some kind of mid-cable leash that will prevent a lost cable from going into the prop.. I’d like to put a Velcro hand strap across the body but I’m afraid that the toggle Not In the nifty groove would be too thick for my small hands. Plus …. Velcro adhesive doesn’t want to adhere to the 3D printed nylon.

I might have a couple more flights with the throggle but right now I’m pretty sure I’m going to re-install the old lever and be on the lookout for a new one with a start and kill integrated to the body of the throttle.

Flight Day. #1114. Spinout!

Well…. That was interesting. This morning… the first day of 2022, I had two aborted launches with a tip over.

The whole thing was so smooth and gentle, that, the second it was over, I knew …. It was OK. Nothing was bent, crushed or broken. Man or machine. The only visible evidence was a scrape on the outer ring and the original keeper was bent flush to the cage. A perfectly acceptable crumple zone, that soft metal V just folded in and absorbed a lot of energy. And…. cage is still round.

The tip-over was the end result of the nose wheel catching an edge just at take off speed. I was drifting toward the boundary of the blacktop and dirt and had started to steer back to center, when (I think), the front wheel barely lifted and immediately touched back down. The sharp edge of the nose wheel appears to catch the edge of the blacktop causing the Falcon to pivot off it’s nose and spin 280 degrees to the left. Then, with it’s energy spent, the Falcon gently tipped over.

Video credit Jacob Niely

Could this accident been avoided? Yes, I can think of a couple of scenarios that would have saved the launch. If I just followed my course and run off into the weeds, it would have been fine. If I’d have popped a little brake before I caught an edge, I’m confident the Falcon would have flown but I like to build as much speed as I can so that the trike leaps into the air.

However if I pulled brake after catching an edge, it would have been a disaster. I’d have spun under the wing and without the friction of the wheels on the surface, it would have probably turned a lot more than 270 degrees. And….When I came back down , who knows what direction I’d be pointed. One things for sure, I’d still be at takeoff speed and probably would have rolled violently. Round tires would , have helped and that’s something not related to reactions or muscle memory. But I like the way the flat wheel steers and it’s small diameter helps to direct the prop wash above the wing before launch. So… I’m going to think a little more, before changing back to the conventional round nose wheel.

Flat bottom tire and line keeper (crumple zone)

After quick check of the rig and lines, I reset and tried again. And… failed again! This time the A-assist ratchet slipped and the wing headed off to the right where I followed it off the field. It was an embarrassing non-event. So… I gathered up the wing and determined to fly, reset for the third time. By now, the wind had picked up to 5 knots and was coming from 90 degrees off the earlier heading. This time the launch was quick, clean and very lofty. No issues with the lines at all.

I’m still not happy with the A assists and I’m not sure I’ll ever get used to not having my hands on the A’s during inflation. Today, the wing was a little slow to come overhead. I’d like to dial it in so I can try Robert’s Throggle.

The air was trashy up to 300 feet, where it settled down but the breeze had increased to 18 knots. Jacob had launched earlier and was well on his way to the beach. I called him and we swapped position reports. He was over the causeway about to descend to the beach. The wind looked like it was going to continue to build so I stayed over the patch.

I landed clean by the truck and waited for Jacob. After waiting awhile for his return I called him again. He was having a slow time penetrating and it took him awhile to make the last mile. Unable to penetrate he eventually he had to descend into the turbulent layer below 300 ft to gain ground on the LZ. His landing was spot on, despite the strong breeze and bumpy air.

It wasn’t a good day but it wasn’t a disaster either. It’s been more than a decade since I crashed on takeoff at Bubba’s. These things happen… and… after all… I did get to fly.

*****UPDATE****

A few days after this was uploaded, Tucker Gott, PPG’s YouTube phenom, put the video on a Blooper Reel. I thought! “Cool, at least there is a good write up “, maybe he’ll make a learning moment out of it.” But then, he called the rig “Rickety and Janky”, what’s Janky anyway? Maybe it’s Janky but Terry doesn’t build anything that’s Rickety. Geez!

Maybe I’ll have to buy a Risky Briskets Tee Shirt

Flight #1098

Nice flight. Low layer of clouds added some spice. The new magnetic wing mount worked as advertised. The perspective from the wing is interesting but it’s not good for shots longer than 10 or 15 seconds.

Robert’s new throttle.

Black wire is ground, red to the coil, the other two blue and yellow to the electric start relay.

My first impression was, “this is too big for my hands. I couldn’t reach all the buttons and controls unless I could changed hand position on the fly.

But… The biggest issue on my mind, was that, the throttle was going to be integrated into the brake handle. Which meant, that, I wouldn’t be able to modulate the motor while using the WTS.

And… With my current wing, (APCO LIFT EZ), the WTS is what you use when in reflex mode. The brakes are forbidden and using them in Reflex mode could well cause a collapse. I suppose, you could hang up the brakes, set the RPM and fly that way but it would be a different style of flying. No backing off the throttle when coming out of a hard turn to dampen the bounce.

How hard would it be to disengage the brake lever to use the WTS? It would probably mean another strap to attach the throttle to the hand, the same as a conventional set-up.

I fashioned a strap using one wrap and an adhesive backed piece of “male” Velcro attached to the body of the throttle. Moving the strap around the handle I was able to find the sweet spot that put all the controls within easy reach.

The twist ties are not necessary. The brake handle nestles into its groove nicely. I don’t think the throttle would fall out of the brake toggle, even if it were hung in the risers. Yet… it can be removed easily, allowing the pilot to go to the WTS.

Day 2

This morning after a nice sunrise flight, I started the swap. After a trip to the hardware store and a few bruised knuckles, I was ready to test it…

First attempt was a huge success. It started right up and the kill switch worked. The second attempt was a disaster. It took awhile to figure it out. What happened was, the start button failed and stuck in the start position. I think the machine is alright, the starter was red hot but I was able to pull the battery cable before it burned. I spent the next hour removing the throttle. I wanted to reinstall the old throttle but it needs a new brake cable that won’t be available until tomorrow.

I’m returning the unit to Robert and look forward to seeing the next generation.

Update… the job is done. Three layers of metallic gold and 3 coats of high gloss topcoat.

Flights #1048 , #1049. Revolution Test Flight

Same weather as last flight there was a fresh breeze 5 to 7 mph from the south.

Paramania Revolution 36 meters……

The wing inflated beautifully, the launch was smooth and predictable. Once aloft it was clear the brakes needed to be shortened. While kiting the wing, I guessed 5 inches. But once aloft it looked more like 12.

The brakes were way too heavy, It was a chore just to fly a figure 8 and land. I came in pretty hot and without much flare at all. I think it will be much better with shortened brake lines but …. will it be enough to make it flyable for me? A big part of the problem is that I’m heavy on the wing. Maybe 450 lbs. all up. Eric warned me that it required strong brake input but that and brake lines 12″ too long, made for a very uncomfortable flight. I was able to eventually take a couple of wraps but even then I didn’t feel like I could apply enough pressure to achieve a good flare. This wing needs a footlaunch guy who weighs in around 200 lbs.

Revolution test flight.

The second flight was with the APCO Lift EZ. No Drama, comfortable and familiar. My folding the leading center edge is getting better. I allowed the motor to run for over a minute and it didn’t catch the wing. The launch was quick and the wing, felt so much better. I would have stayed up longer but the Revolution was still in the field and I wanted to have the truck loaded before dark.