PatPux

I just downloaded PPGPS, and had a play, looks like a great little app. My only concern would be its visibility in strong light, which is where something like the Oregan would come into its own

Uploaded at George's request

Stevie is vouching for one .

viewtopic.php?p=68822#p68822

With this mornings offerings I thought I'd walked into a Monty Python musical....................Spamalot...............terrible, sorry

And add the Contitech 559 belt.

Also see this one - this dude trots backwards while pulling the wing up, risky!

He was going for a run with a Paramotor on his back rather than a fly, wasn't he?!!!![FLUSHED FACE] did he actually get off the ground.

Quite agree about there being fat chance of getting 34square metres of Synth to reverse like the first guy! But really can't see

the point. Or am I missing the..........point?

Ok, makes sense, but as you say...gotta be quick

Someone want to explain what he did there? It looks like he is trying to inflate the wing, but it doesn't appear to have done anything before he turns round.

https://www.facebook.com/groups/3989628 ... 359100843/

Blimey, that's some wallop, mate! Amazed, but glad you and machine are all OK. Agree with you that anything other than a PJ Macro or Compact, might have been matchwood

And here is another Gates belt after a few hours of wear. Already run out of tensioning travel.

Here is the difference in length of belts which are all sold as 559J. These are all brand new belts. The Allen key is in the hole in the prop shaft cam

For anyone running out of belt tensioning adjustment on a PJ Macro as I am (and I know George1966 is). It is possible to fit a 533J belt in place of the OEM 559J belt

The problem was that even with the adjuster cam at full extent , ie with the cam tensioning insert hole at 12 o'clock it was not possible to get the correct belt tension with a 559mm belt.

The next available smaller belt is a 533mm belt, so by rotating the cam by 180 deg you reduce the pulley spacing by about 15mm , so in theory a 26mm shorter belt (26/2=13mm) should fit., but it is that close that getting the Vs over the belt teeth isn't possible without actually removing the big pulley.

Here is what you do

1. Loosen and remove pinch bolt completely

2. Remove old belt

3. Very slightly lever apart the propshaft housing with a screw driver in between the clamping flanges and withdraw the large pulley and propshaft

4. Fit new 533 belt to big pulley

5. Then keeping the two pulleys almost touching slide belt over engine pulley, while reinserting the propshaft into the clamping housing . You may again need to lever the flanges very slightly to help you slide it in

6. Check belt aligned into the correct grooves.

7. Insert and just tighten pinch bolt

8.Insert a lever, I used a long reach Allen key into the tightening hole which will now be right down the bottom at 6 o'clock

Rotate clockwise to tighten belt, hold tension whilst retightening pinch bolt to 35Nm.

So we have the tightness, but I will reserve judgement till I try it. Because the pulleys are now closer together by about 15mm there is an increased belt angle on the bottom pulley that leads to about a 5% reduction in belt to pulley contact area, so that will make it a bit more likely to slip, but I doubt that it is that marginal. Especially as we now have plenty of tightening travel to make sure the belt is really tight.

I have discussed this with Parajet's Dan, who said there was nothing wrong in principle with using a shorter belt, if it fits.

I have found some slight variation in belt length from manufacturers. This belt is a Contitech 12 rib 533J from Simplybearings

http://simplybearings.co.uk/shop/Belts- ... _info.html

The Compact runs a 2.6:1 hub driving a 3 blade prop

The Macro runs either a 3.2:1 reduction hub driving a 3 blade prop or the 2.6:1 hub driving a 2 blade hub.

George has a Macro, now set up with the 2.6:1 hub and a 2 blade prop.

So that means he must be under pitched........doesn't it?

given he has recorded 7900rpm engine speed , which is around the XT172 specified max.

George, I repaired a split in mine successfully, it's held fine and is nearly invisible

See this post

viewtopic.php?p=63045#p63045

After a little ground handling, I made my first reverse launch with the motor. By comparison with forward launches, it's a doddle.

Nice one Pete. So you can see what I mean now about reverses! You are, however in a much better place than me, having mastered your forwards, first.

Glad it's all ok, Chris.

I pull the attachment pin out by screwing an M6 bolt into the pin such that I can carefully lever it out against the outside of the lug.once the pin is out I use another M6 bolt as in the photo, but with a flanged nut that you can't see in the recess of the inner lug, it just slides up in there.

Then by turning the nut on the outside you can clamp the lugs together to close them up. It took me three goes to get the right over tightening to leave me with the correct gap- I didn't want to over do it and then gave to open the gap up, so I was taking it easy.

Here is a slightly more reasonable way to "adjust" your Harness arm lugs if they have gone out of adjustment as the result of .....erhem.... a fall or something

Rather than welting them with a lump hammer!

The pivot arm in question was flopping all over the place as a result of an opening that was only +0.8mm over standard, probably exacerbated by worn bushes, as well.

https://m.facebook.com/story.php?story_fbid=301498953388602&id=100005854994168

It's an M6 bolt and nuts with steel and nylon washers to protect the ally. You need to over-close the gap by 1-2mm to allow for the metal to spring back.

This solution goes with all the usual caveats, including a very detailed inspection around the lug to satisfy yourself there is no stress induced cracking.

But it did get the thumbs up from Parajets engineers ......."they were quite impressed with the solution"

Damn tent just sprung up in front of him! Probably ended up with a nice BBQ-shaped melted hole in his wing, too, for his trouble.

I'm at the other end of the Spectrum, I worry whether I've got enough room to get off in a 400mx700m flat field!

Done, earlier today

I did a bit of detective work on google maps and saw that last village you passed over in the video was Gualchos so I knew where you finished up. I knew roughly where to look because I knew about all the greenhouses, along the coast there.

Many congratulations.

I watched the video at work today with no sound , and only just now listened to it, and heard you say you were going to visit Gualchos!

So much for my scouring Googlemaps to work it out!

Love the idea of a strapping in bench! Don't you just hate those squat thrusts?!

Yes and no grovelling around in the mud and dirt, an essential aid for the older pilot!

They look the same as the ones I put on my field trolley/strapping in bench.

http://www.ebay.co.uk/itm/2-X-260MM-10- ... 4167ceecc1

Yes, amazing! Have been watching the videos daily. Can't believe how quickly you did it. Will be interested to see the full itinerary in due course.

Congratulations, indeed.

If I was trying to match a fault to those symptoms, I would say- a slipping belt driving a wooden prop with more pitch than the carbon one it was replacing. As you power up the belt can't initially cope with the torque, the belt slips raising the revs, but then grips, so the revs die back.

If you're gear driven..........then I haven't a clue!