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Tug tow hook mount position

Be kind to our tug pilots, we cant do without them.
Phill Tadman
Posts: 328
Joined: 18 Aug 2015, 20:38
Location: South Cambs

Tug tow hook mount position

Post by Phill Tadman »

Can you place a tug tow hook mount on the side of the fuselage?

I’m hoping to modify a power model for tug duties, but the canopy extends back a long way and if placed on fuselage top (where I’ve seen all other tow mounts) it would be a long way from the C of G

Phill
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Trevor
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Joined: 19 Jul 2016, 16:29
Location: Hampshire
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Re: Tug tow hook mount position

Post by Trevor »

Phil, hopefully others with more towing experience will answer your question but it occurs to me that a Y-harness is used on some gliders (Fauvel AV36 for example) so I imagine a similar approach could be used on the tug if the single side mounting is deemed unwise.
Pat Marsden
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Joined: 18 Mar 2015, 06:29
Location: Lincolnshire, UK

Re: Tug tow hook mount position

Post by Pat Marsden »

Phil

As Trevor mentions above I would go for a Y harness rather than towing from one side of the fuselage.

Pat
Phill Tadman
Posts: 328
Joined: 18 Aug 2015, 20:38
Location: South Cambs

Re: Tug tow hook mount position

Post by Phill Tadman »

Sound advice, thanks gents
simon_t
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Joined: 17 Mar 2015, 21:45
Location: Herne Bay, Kent

Re: Tug tow hook mount position

Post by simon_t »

I have done quite a few tows with a 50cc Extreme Flight Extra 300. That has a tow release on the right hand fuselage side, and it tows just the same as my Porter with a central tow location. RH side will tend to help correct for prop torque at low speeds, which may just help slightly reduce any right rudder needed on slow climbs. Quite easy to do, with only a small tube visible on the side of the fuz.

Simon
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BrianF
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Location: Brisbane AU
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Re: Tug tow hook mount position

Post by BrianF »

Haven't done it myself, have looked into it for a mate and a large (42%) RV4 tug here now has a r/h side tow point although it hasn't flown yet. It has a very large canopy, so no way to top mount. In the end we decided a side point shouldn't make a difference for non eventful towing, in an upset it was one less release/attachment point to fail and one less length of line to whip around the tail compared to a harness. It was also easier to install. The location was the first viable strong area behind the CG above the wing cutout, which ended up being approximately 2/3rds wing chord from the leading edge.

So to your question, "Can you place a tug tow hook mount on the side of the fuselage?" Yes, you can. Whether you do so is up to you.

Here are some successful installations.
On Youtube channel I subscribe to, Aviation CZ, it has a number of aerotow videos showing side tow points. The tugs seem to tow quite well.
This is one. Video starts from the 4minute mark


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Phill Tadman
Posts: 328
Joined: 18 Aug 2015, 20:38
Location: South Cambs

Re: Tug tow hook mount position

Post by Phill Tadman »

Simon, Brian - thanks for your replies!

I am edging towards a single side mount as it seems easier to implement.

Brian, I’m also trying to use an RV-4 (Hangar 9) as a tug.

Let me know how your friend gets on.

Phill
simon_t
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Joined: 17 Mar 2015, 21:45
Location: Herne Bay, Kent

Re: Tug tow hook mount position

Post by simon_t »

Extra iinstallation:
CFCDEA45-3314-4593-B182-CF7A17043CFB.jpeg
14E40D49-D680-4FA8-8EEF-6FF449C1641D.jpeg
Phill Tadman
Posts: 328
Joined: 18 Aug 2015, 20:38
Location: South Cambs

Re: Tug tow hook mount position

Post by Phill Tadman »

Thanks Simon,

is that epoxy in an oversize tube drilled out for a rod?

Phill
simon_t
Posts: 95
Joined: 17 Mar 2015, 21:45
Location: Herne Bay, Kent

Re: Tug tow hook mount position

Post by simon_t »

It is a thick walled ali tube, about 1/4” diameter, with a wooden dowel glued inside, then bored out to take a snake outer. The V-groove where the towline loop will go is then machined/filed out. The rod is just a bike spoke connected to the servo on the far side of the fuselage. There is local strengthening, to ensure the tow forces are carried into the structure - obviously the force can be quite high if the towline snatches.
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