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Unwanted realism!

The final flight of the V-2 woth wings

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Simon Chaddock27/07/2018 11:05:56
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5791 forum posts
3063 photos

I fear yesterday was the end of my A4b (V-2 with wings).

10 May 17

Set up to do its usual VTO it rose as normal to about 20 feet and then the fan disintegrated!

No thrust, little airspeed and pointing straight up the result was inevitable. It toppled over and dived into the ground.

The collected bits.

25 Jul 18

The bits of Depron at the back are what was 'chewed up' by the disintegrating fan and ejected out the back along with 7 of the 8 blades! The last one was retained "impaled" into the Depron.

25 Jul 18 blade

Clearly the fan hub burst which is not that surprising as the EDF was not cleared for 4s operation and whacking the throttle fully open from a standstill is likely to be pretty hard on the fan's structure but for a VTO with only aerodynamic stabilisation you have no choice. At 2 years old it is perhaps surprising it lasted as long as it did.

Built only as an experiment to see if a cheap EDF could provide the thrust to lift off an air frame vertically meant it was very light built and delicate but it did achieve the intended result and flew remarkably well. It was never intended as a 'keeper'.

As with my other 'built up' Depron structures all the 'electrics' survived the crash completely undamaged and could be used in something else. wink 2

Mowerman27/07/2018 17:08:48
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1561 forum posts
105 photos

Well it was a success over several flights and probably converted the doubters. Great work Simonyes

Don Fry27/07/2018 18:18:10
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4557 forum posts
54 photos

I'm quite in awe. Bet the launch is interesting.

Into wind, stop torque roll, and let the nose drop for transition?

McG 696927/07/2018 20:37:44
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3408 forum posts
1296 photos

Really feeling sorry for you, Simon. sad

But then also pretty convinced that you will come up with another 'unbelievable' new experiment. wink

Cheers

Chris

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