Overview
The factory fiberglass spinner and backing plate have to be prepared to be installed in the Aviprop 4 blade.
Installation
The first task is to locate the center of the backing plate to allow the drilling template to be installed to allow the preparation of the backing plate.
 |
| Drilling jiging holes This process was recommended by Flying Legend |
The drill was checked for square to the drilling table before starting any work. With this complete the jig plate that was on the engine was centered on the back of the spinner backing plate. This was done with the fingers and once it felt centered it was clamped and the four [4] holes drilled to mount the propellor drilling jig.
Note: Do not use center marked on backing plate as it may not be a true center
 |
| Filing jig is bolted to the four[4] holes drilled from the backing plate jig above |
Additional dressing was required to allow a neat fit over the boss of the propeller with the eight mounting holes lining up with the holes in the propeller hub.
 |
| Center hole was dressed to the edge of the S/S plate [drill jig] Eight [8] mounting holes drilled using the jig |
 |
| Backing plate fitted |
With the backing plate mounted the thorny issue of the cutouts for the propellor. A check showed that the base of blade aligned with the spinner face meaning the cutout would have to be more than a circular cutout.
Cutout profiles were trialed allowing a template to be developed premitting the blade to move though its rated range but this will be tested later and may require further modifications.
 |
| Cutout template |
The next task was to mark four [4] equispaced points on the spinner rim and then locate the center for the initial 63 mm holes.
 |
| Marking out hole locations - marking center line [70 mm from back] Drilled hole 63 mm OD |
With the holes drilled the angle from the template was created and a parallel line marked for the opposite side. A length of S/S bar was used as a cutting jig with the scrap removed using a Dremel plastic cutting disc. Each cut out was numbered to its individual location for later reinstallation at the rear of the blade.
With the cutout center on the blade three [3] mounting points was marked at each segment and a S/S #6 floating nut used as a drilling template. After drilling the center hole was enlarged to 4 mm and the two mounting holes countersunk to accept a 3/32'' countersunk pop rivet.
The floating nuts were installed on the underside of the backing plate and spinner secured with 5/32'' clecos through the nuts. The spinner will be fixed using #6 titanium button head screws for their appearance.
Comments
Easier that I thought it would be.
No comments:
Post a Comment