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Oleary83 04-01-2017 05:21 PM

Beringer and Grove Gear
I'm building an RV-8. I have Grove aerodynamic gear with the internal "gundrill' line for brake fluid. I also ordered the Beringer wheels, tires, brakes and axle kit from Aircraft Spruce (the one for an RV-8 with Grove gear).
When I test fitted the axle on to the Grove gear the brake caliper partially blocked the brake fluid exist hole at the base of the Grove gear.
Has anybody seen this before? Do I need a different axle?

TS Flightlines 04-01-2017 06:29 PM

John----can you post some pics of your install? Having talked with Viviane at Beringer US several times on another RV aircraft project, I was told the calipers mount 90* to the ground, similar to a Grove install. Perhaps the mounting bracket is off centered. See if you can post a pic so we can see whats going on here.


Oleary83 04-02-2017 07:23 AM

OK...I will now ask what has to be one of the most embarrassing questions ever asked on this forum.... Can anyone tell me how to post a picture???:)

TS Flightlines 04-02-2017 08:06 AM

John---I sent you an email.


TS Flightlines 04-02-2017 08:13 AM

I have no idea how many RV8's are using their brakes, much less the gundrilled gear legs.
I used Photobucket to upload some a few weeks ago. Was pretty easy.

Oleary83 04-02-2017 09:02 AM

OK. I think I figured out the photo posting thanks to a post on VAF with instructions...this is a great forum.

Below should be two photos one showing the brake caliper on the Grove gear and the second showing the end view of the axle and brake caliper. The caliper arrived installed on the axle.

The caliper is attached to the axle with four fasteners: two that are countersunk (see the fasteners with the yellow witness stripes in the second photo) and two AN4 bolts that go through the brake caliper to the axle and gear leg.

The two fasteners in the second photo with the yellow 'witness' stripes attach the brake caliper to the axle only - not the gear leg.

I think that I need to remove the two fasteners with the witness stripes. This will allow me to move the caliper to a position that is 90 degrees to the ground but will not allow me to re-install the two counter sunk fasteners (i.e. two of the AN4 bolts will have to carry the load of the wheel/tire/brake combination). Assuming the max brake energy is 120K ft-lbs the max shear in the two AN4 bolts would still be below 50ksi - well below the 75ksi max.

Thoughts? Comments? What abouts...?


hope this picture posting thing works...:)

TS Flightlines 04-02-2017 09:39 AM

John---looking at the pics and I sent you an email.


TS Flightlines 05-21-2017 08:22 AM

As some of you know, we've been playing with the Beringer brake conversions for a while now. We have most of the data for the RV's in hand, with a couple of RV's actually having the hoses. RV14, RV7/9, and RV10 packages are pretty well done. Sorry RV12 guys, but not yet.
The hard one was last, the RV8 with the Grove Gundrilled gear legs. Since we dont have any of these gear legs, or a pattern of the axle mounting area, its been alittle tough. John O'leary had a set, but there was an interference issue with the bottom gear leg fluid port and the caliper mounting, so it wasnt usable, from what I was told.

Well the challenge is on the board--How many of you RV8 guys are using the gundrilled gear legs, and if 1 or 2 of you could email me some pics of the axle mounting area, along with the fluid port area it would be a BIG help. We know that Beringer mounts the caliper in a different position, and clearance at the port is 'close', but how close we dont know.

WE think we have a solution, but havent tried it---because we dont have a gear leg to try it on. The RV14A gear leg bottom is 'similar', but we dont know how close it is to the Grove gear.

Pics emailed to tsflightlines@gmail are greatly appreciated.


Carlos151 05-21-2017 07:42 PM

Just sent you some pictures of my install. Hope it helps.

Dbro172 05-21-2017 08:22 PM

Can't say whether or not there will be a solution but something to note... The Beringer wheel and brake assembly might be a bit aggressive for a tail dragger. Grove wheels and brakes for a tri gear model have double puck brakes, which are quite a bit better than the stock Matco single puck, however the grove setup for an RV-8 has a single puck grove brake system. The Berringer setup in your photos appears to be a double puck system. Careful not to brake to hard.

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