Holiday Closure
Please note that we are closed for our end of summer holiday from Monday September 9th to Friday September 13th and then again from Thursday September 19th to Monday October 7th. All dates inclusive..

During the closure all orders in hand will progress as normal but goods will not be shipped during this period. Orders placed on line will be given priority when we reopen.

We apologise for any inconvenience and look forward to serving you further when we return.

We have limited stocks of Total Aviation Engine Oils at clearance prices. Both the Total Aero D80 and Total Aero Straight 80 are now just £4.25 per litre including VAT. Stocks will not be replenished, so when they are gone, they're gone. However the Multigrade and the 100 grade are now all sold out. 

Welcome to Sandalwood Services  THE PLACE for the continuing support for your Jodel or Robin Aircraft
the Market Place for the sale of Ex Airworld UK Stock.

We have  acquired a significant proportion of the stock following Airworld's closure in November 2016 but are also committed to maintaining a supply of Robin and Jodel parts to help the private owner and small business.
We have also retained the format of the old Airworld website to make navigation easier

Many of the items shown on this site are in stock, others may be obtained to order, and there are also some that have yet to be uploaded, so if you don't see exactly what you want please email your requirements to

Because Sandalwood Ltd is, and will remain, a small company we are not registered for VAT and so all the prices on this web site INCLUDE ANY VAT CONTENT. So no nasty surprises when you see the invoice.
This also means that VAT cannot be shown as a separate item on your invoice.

Payment for any item that you wish to buy will be by Bank Transfer. We will process your order and then send you payment details as when your order is ready to ship



You are here: Home > Airframe Parts and Fittings > Venturi

Vacuum Powered Instruments - The Facts

  • Venturi sizes are measured in inches
  • This refers to the amount of suction measured in inches of mercury the venturi develops at 120 mph, not to the physical dimensions
  • The faster you fly the more suction is developed
  • Venturis should be mounted in the slipstream away from disturbed air
  • If you are not sure where this is on your aeroplane, look for inspiration from similar types
  • Connect with soft plastic hose
  • Avoid constrictive bends
  • An intake filter will prolong instrument life
  • Filters will block with use and so require inspection
  • Venturi powered gyros may not be effective until some time after take-off
  • Venturi systems are not ideal for IFR flight because they can ice up
  • A suction gauge will help to monitor the health of the system, but is not mandatory for VFR flight
  • A 2" venturi will power a turn and bank indicator only
  • A 4" venturi will power one vacuum horizon or a directional gyro
  • A 9" venturi will power a horizon, a turn and bank and a directional gyro, although convention says that if you have a vacuum horizon, an electric turn co-ordinator is the usual combination