JoeO – Page 92 – Powered Paragliding. A most Personal form of Flight

263 264 First Colorado Thumper Vance Brand

Temp 45 to 50 f

Climb 200ft/minute

Decent 200/minute

3550 max RPM

Powerplay Sting 250

It was good to get this one past. I met Robert K and Marek M out at Vance Brand Airport.
We launched at 3pm in light winds from the North East. First attempt went bad when the A Assists were not putting enough pressure on the wing causing it to hang back. On the other launches I got on the assists manually and it came up just fine.
(change the endless clamps so the tails point into the cage instead of out where a line can get into them)
Another thing is to be sure the Starter/Tach bar is on the correct side when attaching the risers.

I accidentally killed the motor at 230 feet, when I noticed the starter bar was being pulled by the riser strap. I had time to try one restart but failed and came in dead stick. Smooth as a baby’s butt!

Second flight was great…no problems 200ft/min climb and about the same decent.

Monte’s Powerplay Sting was rock solid and the brake pressure was about what I was used to with the old rig.

Marek and I kited Brian’s wing…it is 2003… very light construction and absolutely not the right wing for this application….nuff said

I need to find a better way to hold the Throttle or get a different one. The ol fresh Breeze lever would probably be just fine.
The next time I’m going to try using light bungee cord for the A Assist to see if I can get some more pull on the A’s and not be pulled forward of the rest of the risers during flight.
One thing that has to be mentioned. At one point I hit this spot on the power band where the noise and vibration was reduced dramatically. It was eerie, for a second I thought the motor died. I think it was a combination of things including including belt slap, prop flutter, and who knows what else. It’s too bad that it was at 2250 RPM which won’t sustain level flight. But I’ll bet it would at sea level with a 62 inch prop!

Cage Netting

Critics

During the Salton Sea and at the Flying Circus there were plenty of opportunities to stand around the Thumper Bullet and critique the design.Whenever the topic of cage netting came up I was surprised when the first thing said was, “Your going to lose thrust!” or “Its a trike you don’t need it.” These comments came from respected pilots.So…How much thrust can it lose?Especially when your not as concerned about keeping hands out of the prop as that rare time when the wing does the unexpected and a line falls near the prop.The thumper cage is new and twice pilots hooked a line at the Salton Sea. PLUS…a four stroke doesn’t shut down as fast as a two stroke so there are going to be a couple of revolutions after you hit the kill switch.

You don’t need much…

I’m not talking about some of the “hammock netting” I saw stretched over the cages of brand new quads.I’ve posted pictures of a minimal net meant to protect from Line Strike. Zip ties make it easy to get the lines tight as a tennis racket and 300 pound deep sea braid is thin and easy to tie.

Redundant Zip Ties

( one under tension)

Tweaking the Thumper

A assist with rope ratchet

— On Wed, 2/18/09, jo3jo2003 wrote:

Terry Chad,
I’ve been dialing in the “Colorado Bullet Thumper 4stroke”.Epoxy Gel and a new longer split fuel hose anchored the motor end of the throttle cable. It was moving around and preventing a true idle.The engine is max at 3800RPMidle at 1800RPMI can probably Pitch the IVOs more…BUT?Chad…how far can you pitch the IVO blades and how do you know when to stop?Can you “over warp” them and damage the system?Maybe I should learn how to measure the pitch just for the “pure research” as you put it Terry.I was glad to read about “belt Flop” on the slack side of the drive system. I’ve noticed some flop and wanted to ask how to determine correct belt tension. If I understood you right what I’m seeing is about normal.Last…Terry ….what do you think? The local Briggs & Stratton guys say I can install the high altitude carb kit in 15 minutes or less. I’m going to be launching from 8200+ MSL a few times this summer and the rest of the time will be at 5300 MSL. I’m thinking that it might be a good if I used Hi Alt jets here in Denver and the mountains and switched to the stock jets for the coastal stuff. These guys are willing to show me how to install and adjust them for the price of the labor Don’t worry….Before I start changing anything I’ll see how it does at the home field. But I wanted to run it by you.It’s just too damn cold and the best I can do is tweak the machine.
JoeO

Hi Joe, I was thinking of you today.

I think 3800rpm is fine.

Belt ‘flop’ on the slack side is normal, but I find it’s best not to watch it;); BTW, I have never lost a belt or even had the belt jump a groove. Belt tension is not something you need to worry too much about..tension it about like you would your underhood car belt. If the belt ‘flops too much to suit you, tighten it a little more, you won’t hurt anything (however it’s probably just fine right where it’s set now)

I don’t know about hi elevation carb kit, but I am curious about it..I wonder what the kit includes? Smaller jets? Different air filter?
One thing that might help is to remove all the filters from the intake shell. Please let me know what you learn about the kit.

It’s cold here too; I delivered a new unit to Indianapolis on Sunday and I demo’d it for the buyer; a 5 minute flight was plenty for me.

Terry

Flying Circus Wrap Up

The drive home was good. I had a massive cold front following off my left shoulder all the way from Albuquerque. At one point the shadow from the leading edge was playing tag with the truck and we were doing 80 mph! Fortunately it stalled at Raton and I never had to deal with icy roads.
The Arizona Flying Circus was great….frustrating but great. Lots of vendors including ParaToys who would never have been welcome or inclined to attend under Bob’s ownership. Nirvana and Paradrenaline were there and their “factory Pilots” put on a great demonstration of flying in ratty air and high winds.
I spent most of my time dealing with equipment issues. The first morning was the most heart breaking because I walked off the field when the battery died. It was two days later that I realized that all I had to do was use the pull start. Doh !
The new cage arrived on Friday afternoon and I spent the afternoon working with Bob Pelloquin to get it assembled and mounted on the frame. As fate would have it there was a crowd of luminaries standing around when it was time to fire it up. Sure Nuff there was a prop strike and one of the tips was damaged. That evening after dinner with Jim King and a couple of other pilots I sat in the hotel room and replaced the blade with one that Johnny Fetz had repaired while at the Salton Sea.
The IVO Prop is an amazing design that enables you to adjust the pitch of all three blades simultaneously by turning a bolt in the hub. Counterclockwise to increase pitch and clockwise to reduce pitch. I had to take it apart and assemble it twice before I got it right but that seems par for the course for me at this fly-in.
The next morning I attempted a launch but the wind picked up and I didn’t react fast enough when the wing pulled me backwards. The buggy rolled to the left and I was forced to kill the engine and abort. Jeff Goin was filming so he was able to brief me on what the wing did. I’m going to have to increase the tension on the steering bungees so that it rolls straight. While I was out there a pilot asked me to start the machine so that he could hear it. Right away it was obvious that the prop was badly out of balance.
The rest of the day I spent working on the machine. Bob and I did some creative bending to increase the clearance and Kent helped me out with shortening the blades by 2 inches. I was wary of making the cut but Kent dug in and they are looking good and well balanced now.
Saturday afternoon was the Bowling Ball Cannon and later the Banquet. It’s all Good.

Flying Circus is soon!

260 261 262 Thumper’s maiden Voyage

I was a little nervous laying out the wing but the motor started like a champ and the Thumper took off just fine. The brake pressure required was alot more than I was used to. and I didn’t like the way the buggy was pitching. Chad didn’t think there was anything to worry about but I’m not liking it. After landing Jerry Frost made it a point to tell me that I needed to raise the hang points because I was wheelbarrowing during launch.
The second flight was very short. The machine was so quiet that I forgot to put in plugs and put on the helmet. Right after lift off The hat went through the prop and when I heard the “wack” I was thinking broken prop or worse. I got off the throttle quick and came out of the dive with just barely enough time to flare. I bounced floated and landed. I write that one off to unfamiliar equipment and move on.
The third flight was pretty good. I stayed up maybe 30 minutes and experimented a bit with the wing. It’s really hard to pull. There is plenty of power at sea level . I’ll know more when I get a chance to fly in Colorado.
//www.youtube.com/get_player

#259 and Carnage at the Sea

hLast flight of the Simo

It was a normal launch in every way…Until… I looked up to check the lines and sure enough there was a great big twig twisted into the A lines. It was deforming the leading edge near the center of the wing and I decided right then to get down so I flew over the field and the scrub that borders the north edge and set down in the first sandy patch available. Up to this point it was a non event, I had plenty of clear space ahead and the surface was soft but not too soft… so I set up for another launch. The wing inflated and the taxi was going fine until the sand got allot softer and the buggy sunk in to the mixture of sand and shells. Instead of killing the engine and aborting I added power and a split second later heard a loud crack.

Some lines were cut, the prop was broken, both of the top pieces of the cage were bent and the frame broke at the top motor mount. It’s hard to believe that a line in the hub could do so much damage.

I was hugely bummed to say the least. Grounded and there was still 6 days of flying ahead!

251 252 253 254 255 256 Salton Sea

Big Day lots of firsts…

Most Flights in one day. It should probably be 256.5 because I did a touch and go that was so long I taxied the full lenght of the field.

First time to fly a performance wing Spice 24 (or there abouts)
First time to fly a 4 stroke. I took up Bens machine with the eden 28.

The thumper flight was marred when I rigged the brake line thru the hangpoint rings and had a friction lock. Landed dead stick at the rocky end of the field. I had to take a wrap on the Brake line above the ring.

Tonight there was a prop burning and outdoor movies.

I had dinner with Ben at the Mexican Resturant…Huge Special plate.

#246 #247 #248 #249 #250

Lots of airtimeSalton Sea! I started at 9am. 5 good launches and 5 good landings. Lots of the low and slow. Flying with the birds. Great day of flying!