+64 (07) 849 1005 Request a quote

Propellor Guards



Surf Lifesaving New Zealand and Australia Approved

Our Pro-Pell Propguards were developed in conjunction with Surf Lifesaving New Zealand to overcome some performance problems with their previous guards. The gains were so significant that the design was patented and Pro-pell is now the guard of choice for Surf Lifesaving New Zealand. We also manufacture guards for export Internationally.

  • All our standard guards are for two stroke outboards as the skeg/gearbox can differ on the four strokes.
  • Our guards are easily fitted and are supplied with all suitable fasteners. Download our easy to follow instructions for easy fitting of your propguard. Fitting Instructions and Drilling Template


Pro-Pell propguards use a patented unique design to achieve optimal performance by: 

  • Reducing cavitation
  • Increasing turning speeds
  • Gets boats up and planing quicker
  • Increases performance in aerated white water

It has been proven that there is more precise and positive handling with a Pro-Pell guard fitted when compared to an unguarded propeller. Pro-Pell guards also have the added advantage of protecting your prop from low impact damage.


product range

outboard brand


Fin Type

No. Fins (per guard)


dims (MM)

Pricing NZD

Yamaha 15hp Hollow Fins   10 Fins (5 each side) 4.5 kgs 300x300x400 $707
Mercury 30hp Hollow Fins 22 Fins (11 each side) 5 kgs 300x300x400 $707
Yamaha 30hp Hollow Fins 22 Fins (11 each side) 5 kgs 300x300x400 $707
Yamaha 40hp Hollow Fins 12 Fins (6 each side) 5 kgs 300x300x400 $707
Yamaha 50hp Hollow Fins 8 Fins (4 each side) 4 kgs 370x370x440 $476
Tohatsu 50hp Hollow Fins 8 Fins (4 each side) 4 kgs 370x370x440 $476
Thundercat Racer Kitset 50hp Solid Fins 8 Fins (4 each side)  NA NA  $375

 Click the link to send your order requests or enquiries to Stainless Design

Propguard orders


  • All guards are supplied with suitable fasteners
  • Pricing is in NZD for NZ cash sale customers only
  • Price is our retail price and includes GST and Freight within NZ
  • The lead time for orders is generally 4 weeks from order, subject to resources and capacity
  • We keep limited numbers of prop guards in stock. If we have propguards in stock then we will despatch once payment is received
  • All Cash Sale purchases require payment to be made before manufacturing commences or despatch
  • Payment options include Bank Deposit, Eftpos and Credit Card
  • A surcharge will apply for all Credit Card payments

Australia Customers

All Australian customers please contact Thundercat Inflatables directly +61 7 5520 6888 or visit their website www.thundercatinflatables.com

thundercat inflatables

International Customers

For all other International enquiries please contact Stainless Design 

 International Enquiries 

Thundercat Racer Kitset Guards

We do a kitset guard for Thundercat Racers to suit a Yamaha or Tohatsu 50hp outboard. This guard is comprises of all parts required for a full propguard and supplied disassembled allowing the user to grind their own specific fin profiles. Fins are also solid as opposed to hollow. We offer the option to weld these kitset guards at an extra cost.

Please discuss with Stainless Design if you wish to have it welded and fully assembled.

Custom Made Guards

We have custom made guards with success for the following engines:

  •     Mercury 15hp
  •     Honda 40hp
  •     Yamaha 60hp
  •     Evinrude 90hp
  •     Evinrude 115hp

Contact Stainless Design to discuss your custom guard requirements.

Please note: Custom guards are costly to manufacture as we make our standard guards in jigs and in large production runs. It is not economical to manufacture guards in small batch runs. We would also require a sample skeg as a jig to fabricate the guard on, as we do not have jigs for all brands. Custom guards are manufactured at customers own risk with no guarantee that the guard will be suitable. The larger the engine the more difficult and therefore higher the risk.

Propguard Repairs

If your propguard is damaged and requires repairs please contact Stainless Design to discuss your options.

contact us today



propguard type

order quantity


Thundercat 50hp Solid Fin Set 1+ $98 per set 
Individual Fins 6+ $10 per fin
  • Fins are laser cut to shape from 3.0mm 304 Stainless Steel Sheet
  • Fins are supplied with square edges so the user can grind their own specific profile
  • Thundercat 50 Fins can be modified to suit a Yamaha and Tohatsu 50hp Outboard
  • Fins are numbered from the top down

Thundercat Fin Sets are made up of:

 1 x Front Rib

 2 x Fin 1

 4 x Fin 2

 2 x Fin 4

Thundercat fins

Please Note: The front rib in fin sets is taller than standard SDL guards to allow the user to trim it to their desired length

Mercury 30hp individual fins




Mercury 30hp Individual Fins 1 $20 per Fin
Mercury 30hp Individual Fins welded onto Guard 1 $60 per welded Fin
Mercury 30hp Full Fin Set (22 Fins) 1 $350 per Set


  • Fins are produced from blanks which are rolled to aerofoil shape and cut to length
  • Fins are numbered from the top down

M30 fins


  • Pricing is in NZD
  • All prices exclude GST and Freight
  • Minimum order charge is $60
  • The turnaround time for orders is generally 5 working days from payment of order subject to availability of resources and capacity
  • Payment is required before manufacturing commences
  • Payment options include Bank Deposit, Visa, MasterCard and Eftpos

Click the link below to send your Propguard Fin orders or queries to Stainless Design

CONTACT us today

Experience it for yourself. Ask for a quote