Search found 78 matches

by JimCrawford
Tue Jan 26, 2021 9:22 pm
Forum: ENGINEERING AND MAINTENANCE
Topic: Leburg tacho signal
Replies: 5
Views: 166

Re: Leburg tacho signal

Ah but if I move the batteries aft I can tune the CofG to exactly where I want it :D

Also it will give some clearance between the back of the prop and the front of the cowling. They were perilously close :shock: I think the engine mounts weren't Nipper original.

Jim
by JimCrawford
Tue Jan 26, 2021 6:35 pm
Forum: ENGINEERING AND MAINTENANCE
Topic: Leburg tacho signal
Replies: 5
Views: 166

Re: Leburg tacho signal

Nothing too exotic Neil ! I've removed the mechanical tacho link from my VW and want to use the Leburg output. Some time ago I speculatively bought some lovely surplus meters, 270 degree needle sweep and in a case which is geometrically compatible with the standard 80mm instrument format. Even marke...
by JimCrawford
Sun Jan 24, 2021 7:24 pm
Forum: ENGINEERING AND MAINTENANCE
Topic: Leburg tacho signal
Replies: 5
Views: 166

Leburg tacho signal

I need to discover the format of the Leburg unit tacho signal - in particular the pulse width and if it is constant width or variable with speed. Voltage and positive going or negative going would also be useful.

Thanks in advance for any information.

Jim
by JimCrawford
Mon Dec 21, 2020 10:45 am
Forum: ENGINEERING AND MAINTENANCE
Topic: Spar clamp material?
Replies: 3
Views: 6225

Re: Spar clamp material?

Take a look at:

viewtopic.php?f=12&t=500

may be of some interest

Jim
by JimCrawford
Thu Jul 23, 2020 10:55 am
Forum: GENERAL CHAT
Topic: OWNERS 'TESTIMONIALS' - WHAT ARE THEY LIKE TO OWN & FLY
Replies: 15
Views: 9693

Re: OWNERS 'TESTIMONIALS' - WHAT ARE THEY LIKE TO OWN & FLY

Hi Ross, There is a mandatory inspection of the wing bolts under the LAA permit scheme in the UK. The bolts must be pulled and checked for cracks. If serviceable they can be refitted, otherwise new bolts are required. They aren't readily obtainable so an alternative is to use studs that used to be a...
by JimCrawford
Sat Jul 18, 2020 4:14 pm
Forum: GENERAL CHAT
Topic: OWNERS 'TESTIMONIALS' - WHAT ARE THEY LIKE TO OWN & FLY
Replies: 15
Views: 9693

Re: OWNERS 'TESTIMONIALS' - WHAT ARE THEY LIKE TO OWN & FLY

If anybody is interested I am replacing my hubs and tyres of the 'unobtainable' sort for hubs to take 400 x 4 tyres. The price for a new tyre was > £400 +VAT and no inner tubes available :shock: . I was worried that I could get stuck indefinitely somewhere away from base with a u/s tyre. I've design...
by JimCrawford
Fri Jul 03, 2020 12:47 pm
Forum: ENGINEERING AND MAINTENANCE
Topic: LeBurg ignition installation
Replies: 17
Views: 12859

Re: LeBurg ignition installation

Their website seems to be working, are they not responding to enquiries?

Jim
by JimCrawford
Mon May 11, 2020 2:31 pm
Forum: ENGINEERING AND MAINTENANCE
Topic: Wheel Hub dimensions
Replies: 5
Views: 3697

Re: Wheel Hub dimensions

Hi Paul, I've measured the spacer on the axle for the 3-1/2 x 4.95 hub and tyre and it is ~ 4.5mm wide. Using a 45mm wide hub placed so the centre of the wheel is in the same place on the axle as the 75mm hub to keep the bending similar, I gain 15mm each side of the hub. Maybe not so much at the rad...
by JimCrawford
Sat Apr 11, 2020 9:23 pm
Forum: ENGINEERING AND MAINTENANCE
Topic: Wheel Hub dimensions
Replies: 5
Views: 3697

Re: Wheel Hub dimensions

Correction to post above. The standard 6 bolt bike disc will not fit as the bolt pcd is too small and interferes with the bearing housing. Rohloff discs have a larger pcd which interferes neither with the bearing housing, nor the central tube separating the flanges. The 160mm diameter bike disc is w...
by JimCrawford
Wed Apr 08, 2020 11:02 am
Forum: ENGINEERING AND MAINTENANCE
Topic: Wheel Hub dimensions
Replies: 5
Views: 3697

Re: Wheel Hub dimensions

Hi David, Thanks for your reply. I think I'll go for the narrower 45mm hubs. This is based almost entirely on the fact that my glider (LS4), with minimal suspension, uses a single standard Tost 45mm hub which handles even my landings at 427kg AUW, so a Nipper with suspension, two wheels and 340kg AU...
by JimCrawford
Wed Mar 04, 2020 11:24 am
Forum: ENGINEERING AND MAINTENANCE
Topic: Rollason Ardem maintenance manual
Replies: 2
Views: 1994

Re: Rollason Ardem maintenance manual

I may have the manual you require in pdf format - I'll search it out.

Jim
by JimCrawford
Wed Mar 04, 2020 11:23 am
Forum: ENGINEERING AND MAINTENANCE
Topic: Wheel Hub dimensions
Replies: 5
Views: 3697

Wheel Hub dimensions

I've been making up some wheel hubs to be able to change my Nipper from the 3 1/2 x 4.95 tyres (made from unobtainium) to easily obtained and much, much cheaper 4.00 x 4 (even from Tost!). However I've come across an interesting issue regarding the hub sizes which I hope the forum may be able to sol...
by JimCrawford
Mon Sep 23, 2019 1:10 pm
Forum: WANTED
Topic: Wingbolts
Replies: 7
Views: 5416

Re: Wingbolts

go to;

http://www.nipperaircraft.co.uk/index.htm

who are the Nipper operating arm of Airweld.

Jim
by JimCrawford
Thu Sep 19, 2019 7:06 pm
Forum: WANTED
Topic: Wingbolts
Replies: 7
Views: 5416

Re: Wingbolts

Hi Bert, Are you trying to comply with the LAA mandatory LAA/MOD/025/003, 01 May 2014? http://www.lightaircraftassociation.co.uk/engineering/Airworthiness/AWA03.pdf I am in the process of replacing the bolts on my Nipper with the stud design supplied by Airweld. They only had a limited stock a while...
by JimCrawford
Sat Sep 14, 2019 1:55 pm
Forum: ENGINEERING AND MAINTENANCE
Topic: Nipper composite fuel tank
Replies: 10
Views: 7539

Re: Nipper composite fuel tank

Hi Neil, I've been working on a scheme for a composite tank, also with a triangular drop to increase the capacity and to provide a sump to the otherwise flat bottom. I hadn't thought of the possibilities of a flop tube but it seems a good idea even though my VW isn't adapted for inverted flight. Bui...

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