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Elevator travel


Mark Evans
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Mark Evans

Afternoon guys,

For your Elevator travel, do you just use equal throws or do you utilise the full amount of down travel you can get, similar how Thomas from Armsoar does it?

I have got myself a new Snipe SNT (2nd hand but never built) and I have never noticed this before on my previous Snipes, but the cut out in the boom limits the amount of down travel available. I will get equal up and down throw but won't be able to use the amount of down that the hinge/spring allows and I don't want to make the slot in the boom any longer which could weaken it. 

I was watching Richard launch last week at Malvern and his CX5 pushes over pretty slow at the top (and looks really light and floaty) so I guess I might need all the down I can get to achieve this? 

Thanks in advance!

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I have extra down travel for the pushover.  If I use that much normally it's too sensitive.  I have made the horn slot longer to achieve this on at least one model.  I put a reinforcement patch around the hole if required.

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Mark Evans

Thanks Mike, I may do the same, make the slot longer to get some extra travel. Will reinforce also for some extra strength. 

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May be better to use a smoother transition at pushover which will reduce drag losses at that moment; just read the speed at the top of the climb to avoid a stall. This will require less down elevator if you’re concerned about increasing the slot for the horn.

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Dave H

If you like to utilise ALL of the launch height , your glider will be travelling pretty slowly and may well need the extra travel on push over.

I tend not to launch into a vertical so I personally don’t use much on push over

that said I still set it up so the elevator just touches the boom . 

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Mark Evans

Cheers guys, this time around I will be trying to launch more vertical to try and eek out as much height as I can get and hopefully break my 40m wall I hit previously. 
 

So it looks like I’m gonna make the slot a little longer to get more down travel, and reinforce the boom around that area so I don’t see my tail parting company with the rest of the plane. 

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9 hours ago, Mark Evans said:

...this time around I will be trying to launch more vertical to try and eek out as much height as I can.....

In case newcomers are mislead, I wanted to point out that Mark is referring to the second section of the launch, when he says, 'trying to launch nearer vertical'.  We try to release horizontally or on a moderate upward path and use a pre-set elevator control to pitch up to a steep angle before continuing upwards in a straight climb to bunt the model into the glide.  On the elevator, we have a spring loaded switch for the pitch-up pre-set and a separate setting for the straight 'ballistic' part of the climb.  You release the pre-set a split second after the glider leaves your hand.  At the top you bunt and go into a normal flight mode.

If you try to release vertically, you will have to take the model low behind you and you will hit your wing-tip on the ground....  Watch 'til the end.

 

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MikeDLG

Very good clarification, Mike.  

I captured a frame just before his launch. It’s pretty clear to see what happened.
I advise to aim your launch to the top of distant trees or buildings. Think launch forward, not up. It’s not just better for the health of your glider, but you can put more power in to a forward, overhand launch, than in upward, underhand launch.

F0A786A6-E3CD-451E-8B03-456D7BE44A86.jpeg

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Here's the moment where he has the model too high because he is going to bring it too low behind him...

Keep the model in a near-horizontal plane in the launch spin.

9D19B049-F18C-4C78-8B7A-15864CC23E0B.jpeg

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Neil Harrison

Are we going to see you at Radioglide Mark?

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Mark Evans

I was hoping to be there to make the numbers up, but I’m starting from scratch as I sold off all my rc gear so I’m not gonna have everything I need in time for next weekend. I’ll be at the next round at the 2 day event at the BMFA center though. 

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