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Infinity 90 Build

How good is it ?

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cymaz17/02/2019 16:09:57
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8488 forum posts
1161 photos

surprise was yours missing?

Bruce Collinson17/02/2019 20:07:41
364 forum posts

Never had one but mine was off a gentleman (in the old sense) via Ebay, another West Country man but not as Far West as you (Apple put those caps in) for under a third of retail. Wing was new, fus was fair but it was sold with no canopy. I figure it will fly to trim and fettle without it. Asked Probuild and they were distinctly non committal.

JH is threatening a boy’s outing to Lidl for a pop bottle. He spoils me. No idea where it is.

BTC

Bruce Collinson22/02/2019 17:09:07
364 forum posts

In case there are silent watchers out there, mine maidened today, mostly satisfactorily. Very little trim needed, ailerons needed softening more than my default 25% expo, wanted quite a bit of down elevato inverted with c of g at 147mm.

then I had a bouncy cross wind landing which didn’t end well. Still, the undercart plate needed beefing up anyway.

otherwise, very happy with it and its Laser 100

BTC

Peter Jenkins22/02/2019 20:07:09
1203 forum posts
132 photos

Wot, no picture!

Bruce Collinson22/02/2019 20:16:51
364 forum posts

Sorry Peter, a technophobe with an I-Thing isn’t conducive, plus England v West Indies is on Eye-Sky.

BTC

cymaz22/02/2019 20:20:04
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8488 forum posts
1161 photos

Nearly there. Completely rebuilt the throttle arm, it was binding too badly, now stripped the threads on the after market throttle arm.....will this build ever end crying

cymaz24/02/2019 16:57:36
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8488 forum posts
1161 photos

Finally took it outside to get some sun on its back. Went up the flying field. Tested the failsafe, set the end points on the throttle and did some range checks. All good. The DLE20ra turns a Graupner 16x8 @ 8000 WOT. The sound check reviled 86dB @ 7m, that’s too loud at the moment for St Austell DMC. I still have the pepper pots to put it the exhaust extensions to make it quieter. Not sure wether to add both or one at a time....probably the latter. Making progress now, light at the end of the tunnel. No maiden wind 12/15mph dead crosswise to the runway at Davidstow Airfield.

Bruce Collinson13/03/2019 13:48:45
364 forum posts

weather's the pits, n'est pas? Got mine repaired, u/c plate replaced, new wheels to reduce bouncing and even an exploratory hole in the bottom cowl for the exhaust and needle valve. Still not fitting it, nor the spats, until it has had a few more "proving" flights. Just need less wind!

Good luck with the pepper pots. If I were a betting man, I'd have £5 on minus 1 dB and minus 300 rpm per pot.

BTC

cymaz24/03/2019 08:17:15
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8488 forum posts
1161 photos

No flying for nearly 5 weeks. Took it out yesterday as the weather was ok. No start, intermittent firing. Went home in a huff

Peter Jenkins24/03/2019 09:21:19
1203 forum posts
132 photos

Dirt in the carb?

cymaz24/03/2019 09:44:34
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8488 forum posts
1161 photos

No, got home tried the ignition on the test rig all ok tired new battery ok, tried plane battery on an old cdi....ummm......intermittent spark, tried plane cdi on plane battery and wiggled the battery wires.....intermittent spark.

Loose wire in the pin

Took the pins out of the shroud and saw a little bit of corrosion At the negative pin. The ignition pack from the plane was not worth keeping, now recycled.

Happy that the fault appeared on the ground.surprisesmiley

And the moral is....check the battery wires. I’ve tested that battery several times. Even checked the voltage at 1amp / 2 amp draw. It was always good. Held the charge well also.

New battery on order.

Edited By cymaz on 24/03/2019 09:45:17

Edited By cymaz on 24/03/2019 09:46:02

Peter Jenkins24/03/2019 10:10:42
1203 forum posts
132 photos

Well done on the fault finding. Will go and check the condition of the wires into and out of my CDI!

Jeremy Harmer24/03/2019 11:19:27
3 forum posts

Just glad I put an ASP 1.20FS in my Infinity. Like a Rolls Royce, "Adequate power", super quiet and loads of fun to fly.

But also glad you've sorted your problem Cymaz. Looking forward to your comments once you've flown it.

Glueroo

cymaz24/03/2019 17:27:50
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8488 forum posts
1161 photos

Maidened the plane today. It was 10-15 ph winds so really only got to grips with it. Did a few circuits, bunt, loop and a knife edge.

CG is good at 147mm. The DLE20ra ran well and seems good power for the airframe. Using a Graupner 16x8.

Suggested throws are OK to start with and didn’t cause any problems. Landing into wind caused no issues, the wings when set level seem to keep the airframe so.id without too much rocking. The carbon undercarriage provides just enough give without being bouncy, absorbing a lot of the landing stresses.

The trim continues to peel and tries to litter the countryside. Must attach more diamond tape to the edges.

Peter Jenkins24/03/2019 17:35:06
1203 forum posts
132 photos

Congrats. Now you can start the trimming process and then on to aerobatics! Look forward to hearing how it performs.

Bruce Collinson24/03/2019 19:06:08
364 forum posts

Well done Peter, fly well don’t they?

BTC

cymaz09/04/2019 20:18:35
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8488 forum posts
1161 photos

Flew it again today, it has been a few weeks since the quick maiden. Took it up to Davidstow MFC after work.

Tried a couple of props

  • Graupner 16x8
  • Aerostar wood 17x6

The 17x6 was a better prop. It gripped the air better, much more control on the turns and great for slowing down on the landing. The engine was not so laboured on pick up and spin so much better. Needs a tiny mix of down elevator to throttle increase. Rates, throws etc should be done over the next week or three......if the weather behaves itself at the weekends.

Bruce Collinson09/04/2019 21:40:41
364 forum posts

Good to know. Mine is ready for a break in the weather.

BTC

Peter Jenkins09/04/2019 23:19:57
1203 forum posts
132 photos

Cymaz, I would recommend that you alter the engine downthrust rather than use an elevator/throttle mix. Why? Well, the elevator/throttle mix cannot be right for every speed and power selection situation whereas with the correct downthrust you will not have that problem. On the other hand, if it's a devil of a job to alter engine down thrust then the mix may be a simpler, but not the best, route. Presumably the side thrust is OK otherwise you will again have the decision of alter the side thrust or mix in some rudder.

ASH.10/04/2019 00:54:48
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279 forum posts

Cymaz, regarding flyaway trims.. I would seal them by using clearcoat or clear nail varnish. I know it can be time consuming and it's somewhat superficial compared to other things discussed here but it will help preserve her looks.

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