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Park size Avro Vulcan pusher prop

Old 02-13-2019, 02:09 PM
  #26  
Abuelo
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Watching, and subscribed.
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Old 02-13-2019, 10:55 PM
  #27  
quorneng
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You can always put in suitable 'finger' hold recesses in the under side
My XB 70 has a pair.
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They are either side of the EDF (AEO 70 mm!) as it about the strongest thing in the whole plane!

I appreciate you have a prop to worry about but if you positively drop your arm as you release the plane your hand should be well out of the way by the time the prop passes.
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Old 02-15-2019, 03:10 PM
  #28  
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The Parkjet has similar recesses for fingers to grip for launch ... nothings thrown out yet ... all possibles considered.

Looked in my drawer and all I can find is the old P1 Gyro that Banggood were selling .. its a simple 3axis with manual pots .... OFF - Normal stabilised - AVCS modes with V tail / Elevon and conventional outputs.

I never had much luck with it before - as it has a terrible setup routine where you are counting flashes of Blue / Red LED.

Today I fitted it and persevered ... I know some have had good success with it .. my biggest concern of course is that manual gain. At least with the A3 - I have Tx controlled gain ...

To save embarrassment - I have set my 3 pos switch as : OFF - OFF - Normal .... just in case ... YES ! I have accidentally taken of with that switch wrong ... gets very painful taking of in AVCS mode ... so I avoid AVCS modes like the plague !!

Just laying out wiring ... then its sheet top of wing... making sure all propped up level to avoid any twists.



I know I'm not the most tidy when it comes to laying out the wires !!

Top sheet on and letting the UHU POR really take ...



Because of the compound curves involved ... there is FG tape round the wing outer circumference

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Old 02-15-2019, 03:15 PM
  #29  
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Weight check .... everything except cockpit top is 620gr .... that includes wheels etc. So once cockpit top is made ... looks like 660gr all in
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Old 02-16-2019, 05:34 PM
  #30  
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Ready for paint ...





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Old 02-16-2019, 11:59 PM
  #31  
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Super job Nigel. The Vulcan is looking great.
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Old 02-17-2019, 03:17 PM
  #32  
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Painted ...

Before decals



With



She does have one area that worries me ...

Looking from nose back over wing ... the left wing (starboard) top surface has dipped behind that main spar ... enough that when viewed along wing to set ailerons - you see it. I don't think it will stop her flying - but may introduce some aileron trim ...
I'm think adding the stabiliser was a wise decision as that will help me overcome this.

If I was to build her again ... I would add some radial supports back from that main spar to support that top sheet.

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Old 02-17-2019, 03:54 PM
  #33  
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NICE!!!
Waiting for maiden video???
GOOD LUCK!!!

JIMMY
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Old 02-17-2019, 06:27 PM
  #34  
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Hatch cut over the CoG and Soloshot mount fitted ...

Hatch :





40gr SS3 Tag to go in



Held in mount by Velcro



hatch closed ...



She rec'd touch up paint to hide the tape.
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Old 02-18-2019, 12:55 AM
  #35  
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I wouldn't worry too much. Deltas generate far more lift from the underside area and the vortex effect than the actual section particularly at smaller sizes. I doubt it will even be noticeable with the generous aileron area.

A nice thick wing yet the elevon servos stick out through the upper surface. Just saying! .
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Old 02-18-2019, 07:53 AM
  #36  
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I know ... servos struck me as an eyesore as well !!

This happened because I was trying to find a way to mount the servos before sheeting over the wing. I set them into the wing sheeting before laying onto the spars. Without the arms and rods - it looked fine. Add the arms and rods .... UGH !!

I'm sure that after a period - I shall be building another .... things like this will be addressed.

I would like to consider an EDF version later ... given that I have kept it to the 660gr mark .... starting to wonder if those 30, 35mm EDF's would do it.

My thoughts are to keep to a flat-plate wing and the EDF's not be enclosed, but free to breathe.
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Old 02-19-2019, 12:03 AM
  #37  
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Thats why I mount wing servo on their sides. Set the arms to be i right position before the wing skin goes on thus move the arm so it is below the wing skin. All you have to remember is where to cut the slot!
Of course it all works much better if the servos protrude through the underside as you can cut the servo arm slots before the top skin goes on.
With 3D printing you can make bespoke slot covers as well.
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I do understand why you have then on top on the Vulcan although you might find it can land so slowly that damage to underside horns is not an issue.
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Old 02-19-2019, 11:06 AM
  #38  
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Like everything in life ... after we do something - we look and think - Why the hell did I do that ??

Maybe later I will change ... but first i want to see if it flies !!
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Old 02-19-2019, 07:28 PM
  #39  
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Today I decided to swap out the LONGGGGGG U/C legs for the shorter Stinger legs supplied with the mounts. This means that the rear prop hits the deck at about 20 deg nose up ....

So taking the suggestion by another ... I fashioned a rear skid hot glued in front of the prop. When the nose lifts and tail sits down on take-off - the skid will hit ground first ... its longitudinal so it should slide ok,

It does mean of course no Vulcan steep climbs from take-off ! At least not until she's clear of the deck !
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Old 04-05-2019, 03:57 PM
  #40  
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Hope to maiden her this sunday ... fingers crossed ... wish me luck !
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Old 04-06-2019, 02:25 AM
  #41  
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Good luck. Looking forward to hearing about the maiden.
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Old 04-06-2019, 09:56 AM
  #42  
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Charging batterys ready for tmrw !
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Old 04-08-2019, 01:16 PM
  #43  
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Not so good...


New U/C legs fitted and prop
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Old 05-12-2019, 04:40 PM
  #44  
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Finally !!



Ok she goes home broken ... but the concept works and has spurred me on to do a better model ...

Considering larger so I can put retracts and to be honest I think a tractor prop up front to get around that high angle she needs to rotate to on take-off.

The model had to have small prop as a pusher to avoid hitting the deck on rotation ... in the end I needed a wire skid ....
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Old 05-13-2019, 01:54 AM
  #45  
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It was flying nicely before it went in. Wonder what happened? I've got a new DX8 and have three models crash at about the same distance from the transmitter.
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Old 05-13-2019, 08:53 AM
  #46  
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Not sure ... I know I was slowing her down in the circuit for turning to go for runway .... maybe sh just slowed too much ?

In the video you see I do try her at low throttle but its only for a few seconds. In that final circuit - maybe being longer reduced throttle - meant she was slowing down too much ?

I think in terms on full fuselage / wing form ... I may have been a bit optimistic. This size maybe is better flat plate hand launcher ... keeping weight down.

I am now putting together a flat plate version same size to test this ... before going for a much larger version. I'm using the same 3view I used for the first - but for outline only. Rest is cut as I go design !!

I may make this second one a Prop in Slot similar to my Eurofighter ...
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Old 05-15-2019, 12:25 PM
  #47  
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Prop in slot with plenty CF spars..



Added longitudinals as the rear flexed too much after cutting the slot ...



Even that didn't cure it - so added vertical shallow bulkhead both sides ..



Thought the 3D exhausts added character ..



Ready to go .. 430gr AUW incl 1800 3S .. 2200kv wth 6x5 ..



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Old 05-15-2019, 02:41 PM
  #48  
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Originally Posted by solentlife View Post
Prop in slot with plenty CF spars..



Added longitudinals as the rear flexed too much after cutting the slot ...



Even that didn't cure it - so added vertical shallow bulkhead both sides ..



Thought the 3D exhausts added character ..



Ready to go .. 430gr AUW incl 1800 3S .. 2200kv wth 6x5 ..



NICE!!!
Jimmy
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Old 05-15-2019, 03:48 PM
  #49  
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Tks RR ...

I purposely kept it simple after my first with the full Fuz / Wing form. The first flew - but showed various areas that make Vulcan not such an easy model. With this simple 6mm Depron job ... I see the ultra simple variation and then decide on the middle road to achieve best compromise.

I hope to arrive at a solution to use small EDF's but achieve reasonable flight.
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Old 05-15-2019, 09:57 PM
  #50  
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Curious to see how this one flies Nigel.
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