Search found 73 matches

by JimCrawford
Fri Jul 03, 2020 12:47 pm
Forum: ENGINEERING AND MAINTENANCE
Topic: LeBurg ignition installation
Replies: 15
Views: 8674

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: 2332

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
Fri May 01, 2020 9:58 am
Forum: FOR SALE
Topic: Post Retirement Clear-out - 1
Replies: 4
Views: 1035

Re: Post Retirement Clear-out - 1

I can recommend these books, I've had this set for donkey's years. Even if you are not interested in building an aircraft reading through the compendium of experience and knowledge of Tony Bingelis is well worth while and leaves you with a valuable understanding of the why and how of many general ai...
by JimCrawford
Sat Apr 11, 2020 9:23 pm
Forum: ENGINEERING AND MAINTENANCE
Topic: Wheel Hub dimensions
Replies: 5
Views: 2332

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: 2332

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: 1166

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: 2332

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: 3996

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: 3996

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: 2883

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...
by JimCrawford
Wed Aug 21, 2019 10:28 pm
Forum: ENGINEERING AND MAINTENANCE
Topic: Nipper composite fuel tank
Replies: 10
Views: 2883

Re: Nipper composite fuel tank

Hi Neil, My concern with repairing the existing tank by doing as you suggest, de-riveting the seam and using Proseal to re-assemble it, is that the original tank would have been made before ethanol in fuel was even thought of as a good idea. In an era of Avgas and no ethanol mogas there was unlikely...
by JimCrawford
Sat Aug 17, 2019 3:36 pm
Forum: ENGINEERING AND MAINTENANCE
Topic: Replacing undercarriage suspension bands
Replies: 12
Views: 2761

Re: Replacing undercarriage suspension bands

Hello Neil, I hope to be camping at the rally over Saturday night, assuming the beer festival is on again. Possibly Friday night as well. Don't bother with the tool if the bands can be fitted without it. I would have gone for the bungee mod but by good fortune managed to get hold of a ring set. Othe...
by JimCrawford
Thu Aug 15, 2019 11:31 am
Forum: ENGINEERING AND MAINTENANCE
Topic: Replacing undercarriage suspension bands
Replies: 12
Views: 2761

Re: Replacing undercarriage suspension bands

Hello Neil, Yes, I'm sad I'm not flying it but..... force majeure. If you have a tool for fitting the u/c suspension then I would be interested in borrowing it. Are you going to be at the rally? My suspension is the Neumann (sp?) bands not the bungee mod, I was lucky enough to get hold of a set and ...
by JimCrawford
Wed Aug 14, 2019 8:39 pm
Forum: ENGINEERING AND MAINTENANCE
Topic: Replacing undercarriage suspension bands
Replies: 12
Views: 2761

Re: Replacing undercarriage suspension bands

Hi Neil, No, not yet. The undercarriage structure is demounted to clear up a little surface corrosion and to repaint. Everything has slowed down drastically due to unforeseen domestic commitments. I'm also changing the hubs from the 4.95 x 3 1/2 style to 4.00 x 4 . The quote I got for 'old new stock...
by JimCrawford
Tue May 07, 2019 11:33 am
Forum: ENGINEERING AND MAINTENANCE
Topic: 2 stroke engine in a Nipper?
Replies: 2
Views: 1855

Re: 2 stroke engine in a Nipper?

Check the 4 stroke Briggs and Stratton conversions used by hovercraft people (and crazies that race lawn mowers :shock: ) Complete with belt reduction gear you are looking at 40HP at about 2200 propeller rpm and a weight of ~ 100lbs. This won't be much less thrust than a 1600 VW at 3400 rpm, if at a...

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