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Can my glider be towed using it's hi-start hook?

Or do I definitely have to install another servo?

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Chuck Plains06/05/2017 16:51:43
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I've recently finished a basic pod and boom fuselage, so that I can get an old set of Precedent Hi Fly wings up in the air.

Heh, but I built it without considering that the club I go to rarely has a bungee set up these days.

So, the question in the title stands. Can it or can it not be towed up using the belly hook?

Edited By Chuck Plains on 06/05/2017 16:52:01

Trevor06/05/2017 17:32:55
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If you are talking about hand towing, then yes. But if you mean aerotowing then no. You will need a release mechanism in the nose.

TIM Shaw06/05/2017 18:27:15
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I don't think its quite that clear cut, TBH.

What control surfaces do you have?

If you have ailerons it is possible to aerotow using a hook, but it is certainly a good idea to ensure both the tug and the glider can release the tow if necessary.

Without ailerons you simply will not be able to aerotow using the hook, unless the idea is to use masses of power and go up vertically, irrespective of what the glider is doing.....

An alternative might be piggy back cradle?

Chuck Plains06/05/2017 20:39:36
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Thanx for the replies fellas.

It's a 2 channel, no ailerons. I've already emailed asking if I can set up a bungee for the Devon Glider Day on the 14th. It's originally stated as aero tow or electric powered only.

PatMc06/05/2017 21:35:05
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What about a pylon mounted motor ?

Speedster06/05/2017 21:35:59
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Start at 2:00
Cheers
Soren
Chuck Plains07/05/2017 08:40:31
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Posted by PatMc on 06/05/2017 21:35:05:

What about a pylon mounted motor ?

Heh, I already have a 'firewall' built in and just added a foam nosecone in front of it. So a motor was always in the background for this one.

But to truly answer your question. I detest the sight of motor pylons. To me, they're about as attractive as an armchair on an Albatross.

Chuck Plains07/05/2017 08:57:31
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WoW! Thanks for that Speedster!! Velcro! Why didn't I think of that? DOH!!! face 7

I watch a lot of your videos by the way, using both of my YT channels (wordeet is my oldest one)

Chuck Plains07/05/2017 10:25:21
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Facepalm!

I've watched your Towing 2x Alulas video before and never mentally clicked that you mentioned the velcro back then!

I might suggest it for the Devon Glider Day later in the year. smiley

Hamish07/05/2017 10:42:38
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Only done it a few times , on my own, using a bungee. Down elevator to get it up and then up elevator or fly past bungee to get off. Models did not have ailerons.

Does being towed by a tug make much difference?

Edited By Hamish on 07/05/2017 10:43:57

Chuck Plains07/05/2017 11:07:41
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Yes, a tug tow is the last stressful for the glider. Couldn't possibly use that Velcro if it was otherwise.

KiwiKid07/05/2017 11:30:39
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Do you own a dog? laugh

Edited By KiwiKid on 07/05/2017 11:32:11

Andrew Ray07/05/2017 20:26:49
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I don't think it is a good idea to aerotow using any form of belly hook.

Geoff Sleath07/05/2017 21:44:35
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Posted by Chuck Plains on 07/05/2017 08:40:31:
Posted by PatMc on 06/05/2017 21:35:05:

What about a pylon mounted motor ?

Heh, I already have a 'firewall' built in and just added a foam nosecone in front of it. So a motor was always in the background for this one.

But to truly answer your question. I detest the sight of motor pylons. To me, they're about as attractive as an armchair on an Albatross.

I built a Hi Fly years ago (in fact it's still up in the loft) and IIRC there was a motor pylon kit included. It was designed to fit between the wings. I think I glued it together but never covered, painted or used it. In fact I only had a couple of attempts to fly it well before I passed my 'A' or had any idea how to fly!

Geoff

Andy Meade07/05/2017 22:18:06
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Posted by Andrew Ray on 07/05/2017 20:26:49:

I don't think it is a good idea to aerotow using any form of belly hook.

As above - aerotow releases need to be in the nose or very close to it on the underside.

Chuck Plains07/05/2017 22:48:51
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Posted by KiwiKid on 07/05/2017 11:30:39:

Do you own a dog? laugh

Edited By KiwiKid on 07/05/2017 11:32:11

Hahahhahaah! So awesome!!!! face 20

Chuck Plains07/05/2017 22:50:22
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Posted by Andrew Ray on 07/05/2017 20:26:49:

I don't think it is a good idea to aerotow using any form of belly hook.

Checkout Speedster's video. wink 2

Chuck Plains07/05/2017 22:51:16
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Posted by Andy Meade on 07/05/2017 22:18:06:
Posted by Andrew Ray on 07/05/2017 20:26:49:

I don't think it is a good idea to aerotow using any form of belly hook.

As above - aerotow releases need to be in the nose or very close to it on the underside.

Again, check out Speedster's video. smile d

Chuck Plains07/05/2017 22:54:28
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I used my bungee this evening after a few chucks. It works, but I'm not too happy with the glider now. I'll be posting about that elsewhere.

Martin Harris07/05/2017 23:21:19
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What needs to be borne in mind is not only the tow hook position, but the effect of the moment arm trying to rotate against the centre of pressure. In plain terms, a fairly low set wing (like the model in the video) is less critical than something like a scale vintage model with a high mounted wing.

In the full size world, belly hooks have been responsible for far too many tug upsets where the glider has rotated the tug's tail up and put the tug into the ground when a glider pilot has got just a little too high. At least with typical C of G hooks on model tugs this is a lesser hazard to the tow plane but tugging from a hook designed to facilitate a high angle of attack towline or bungee launch is bound to make life uncomfortable.

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