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Hospitalised, my own fault - but ?

Nasty wound to my right arm.

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Tim Flyer11/08/2019 21:18:33
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1295 forum posts
236 photos

Great to hear Colin I think the sleeve protector Is a good idea and it should be quick and easy to put them on for a launch. Many sports and pass-times require it as sadly our flesh is about as vulnerable as a cucumber! and almost any fabric over it reduces injuries. When I mountain bike my “summer jersey” has 3/4 length sleeves with tough nylon fabric on the top side of the sleeves just to prevent thorns and nettles damaging the arms on overgrown trails. The right clothing makes a massive difference to enjoyment!

Trevor Crook12/08/2019 07:34:25
982 forum posts
71 photos

Colin, hope the injury is healing well - nasty! Reading this thread suddenly reminded me that my son and I each had E-Flite Grumman Wildcats a few years ago. Very similar size and shape to the Buffalo. We self-launched, but I remember the trouble we had holding on with one hand when the throttle was opened. We solved it by launching at half throttle - still enough power to get away, but easier to grip. May be worth trying if you dare go near it again!

Peter Miller12/08/2019 08:37:28
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11204 forum posts
1321 photos
10 articles

Talking of arm protection. A few years ago my OS 40 FS threw its prop. Luckily I had on a shirt, fleece AND jacket.

Considering all the protection and the fact that the prop was no longer attached to the engine. The bruise was quite impressive. Photo shows it.

Another club member had a Saito 30 four stroke throw a prop which got him in the hand. It too three stitches to sew the vein up and another four to sew the gash in the flesh up.

Even props no longer under power are pretty dangerous

Colin Leighfield12/08/2019 11:28:26
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5998 forum posts
2504 photos

Thank you Tim, Trevor and Peter. This thread is providing all sorts of experiences and lessons. We don’t think about what damage a prop might do if it comes off. James and I had planned to go to the field yesterday and fly the Buffalo but the weather was lousy with strong gusting wind and intermittent showers, so we didn’t. However we will do it ASAP and make sure that the kamikaze event doesn’t repeat itself. The protective Kevlar sleeves are due for delivery today and I will share what they are like on here.

Colin Leighfield12/08/2019 19:30:46
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5998 forum posts
2504 photos

bba0b395-2114-4691-ad7e-17c513bb559b.jpegThe Kevlar arm protectors arrived today. I am impressed, like a thick knitted fabric but very easy to put on your bare arm or over a sleeve. Comfortable and not heavy,. For the small amount of money they cost, it could be a no-brainer. The damage we regularly do to hands and fingers is bad enough but bone close to the skin generally limits the damage. However the area from wrist to elbow has a potentially lethal risk, so this simple protection might be the minimum inconvenience answer. 3aa0036b-ce67-488e-b3b6-58c1e3e4e2ee.jpeg

Colin Leighfield19/08/2019 15:21:02
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5998 forum posts
2504 photos

b8dd9961-0691-4b98-a1ec-1a4a696a7aa7.jpegThe six stitches were removed today and the wound is healing very well. Many thanks to the team at Royal Stoke hospital. When you think that this much damage was done by a 10” prop, it makes you realise just how serious this sort of injury can be.

I hope no one has been offended by my sharing all of this on the forum but I felt that in spite of my embarrassment at being caught out this way, if it reduced the risk of someone else suffering similar or worse by raising awareness then it would be worth it. To say that I have been lucky to get away with it so relatively lightly is no understatement. a6ff9555-94c5-4c4f-b953-e66b11adb7c7.jpeg

Don Fry19/08/2019 15:28:04
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4557 forum posts
54 photos

Ow, ow ow ow. I am very happy to be reminded at second hand.

Doc Marten19/08/2019 16:08:15
609 forum posts
9 photos

What was the reaction at the hospital when you told them how you'd received the injury?

Colin Leighfield19/08/2019 16:43:05
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5998 forum posts
2504 photos

Hi Doc. Mostly shock and concern at the level of damage that had den done. I tried to make light of it, but they didn’t.

Bob Cotsford19/08/2019 17:37:02
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8625 forum posts
483 photos

Once again Colin - OUCH!! Certainly not offended, I'm just thankfull I got away with past mishaps. I could have in your position many times but for the grace of your chosen deity.

J D 819/08/2019 18:09:33
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1522 forum posts
84 photos

Well worth another reminder, and it was a smallish prop by todays standards!

Edited By J D 8 on 19/08/2019 18:10:06

Colin Leighfield19/08/2019 20:44:12
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5998 forum posts
2504 photos

Thanks Bob and JD8. Safe flying!

dave windymiller11/02/2020 21:41:18
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107 forum posts
148 photos

That twin sc52 ripmax rapier was mine and i built a replacement following a flight that finished at -6" altitude!!

I struggle to launch this model these days so i am thinking of a dolly for take off (whilst i still can count to 10). Either that or a vertical takeoff ramp!!

Dave

Ripmax rapier twin launch - youtube

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Edited By dave windymiller on 11/02/2020 21:46:40

Edited By dave windymiller on 11/02/2020 21:47:07

Old Geezer11/02/2020 22:42:54
670 forum posts

Very sensible - ideally you could fit a separate receiver and servo ( and battery obvs!) to the dolly to give directional control on the ground - and even another servo to stop the dolly and delta from parting company prematurel before it had reached safe flying speed .

Peter Miller12/02/2020 08:36:17
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11204 forum posts
1321 photos
10 articles

For years I have refused to even touch a model with the prop anywhere but right out in front.

Seen (and had) too many accidents with props in unusual places.

FlyinBrian12/02/2020 11:53:29
643 forum posts
4 photos

A few years ago I had prepared my WOT4 Foam-E and was just about to go out to the patch. Another club member had just started to walk out so I decided to wait and placed my model at the side of one of the set up tables, the port wing was poking under the table however I did not unplug the battery!. The tx was standing on the table and I leaned onto the table with my bum. The table tilted and the tx fell forward pushing the throttle stick open. The model leapt forward and pivoting around the table leg attacked my foot. As I was wearing sandals I got two hefty cuts across the top of my foot. Fortunately with the assistance of other club members the blood was staunched and I took my self off to A&E where I received three stitches in one gash and four in the other. Fortunately there was no nerve damage but the top of my foot still goes a bit numb sometimes.

My own stupid fault but easy to do!

Bruce Collinson12/02/2020 13:36:34
541 forum posts

I recall the OP last year but didn't get as far as the kevlar sleeves which do make a lot of sense. There is a small fleet of Raven foam wings with rear props at NLMFC but they launch pretty well,almost vertically with one hand (left for most of us) on the left wingtip, angled away from the pits.

I witnessed an incident similar to Brian's above in the pits a couple of years ago and it was startling, for how fast it occurred and how long it seemed to take before intervention stopped the motor. No serious damage done, but ...

We should really leave electrics disconnected from their batteries until on the strip and we should all have throttle kills with audible alarms. I'm about to modify my habitual kill switch to a lift-to-move type. Plugging in bottom-hatch batteries on the strip is impractical. However, with two F3A electrics due to be rolled out when our strip is fit, both running 6S, I'm either going to plug in on strip, both top hatch luckily, or fit the electric fleet with external isolators, a la George Worley/BMFA mag.

Which prompts two practical points; George's harness introduces a lot of asymmetry in the lead lengths; I recall there's a propensity for side effects; what's a sensible limit to the difference in length thus created? Is it worse with higher voltage? And secondly, aren't XT 90s a bu**er to get apart? Tried a little graphite; do I abrade the male slightly to reduce the friction, or use a smear of vaseline? Drill holes and fit loops? Advice welcome, these are my first 6S models.

BTC

dave windymiller04/07/2020 22:19:24
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107 forum posts
148 photos

MK2 dolly with seperate rx for steering for Rapier twin.

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20200606_202206.jpg

MK1 used balsa blocks that located into the handgrip in the center assuming it would lift away before the back prop reached it. Wrong. It flew but the rear prop was broken (thankfully the engine stopped too). The balsa block was destroyed. This one has a camera to get a close up of the carnage as viewed from underneath!!

What could possibly go wrong?

perttime05/07/2020 06:29:08
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160 forum posts
11 photos

Use a bungee and a launch ramp?

**LINK** (article on modelflying.co.uk)

Edited By perttime on 05/07/2020 06:30:56

Chris Walby05/07/2020 07:27:49
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1275 forum posts
315 photos

Dave, having been through the launch options with the Vulcan, (over weight and under powered) and various experiments with my funfighter I hopefully can add some useful information.

Bungee - pain in the bum setting it up and nailing it to the runway, prevents others using the strip. Advantage is it can impart massive acceleration in a very short distance and time (the Vulcan is 0 to flying in about 10 yards from a 60lbs bungee!). I don't think you need that sort of assistance. There is consideration of where you put the hook and if the airframe can take the forces applied. Getting the bungee to drop away without becoming entangled in the rear prop is an issue. Nothing worse than seeing it climb out only to realise that its still tethered and following an arc that will not end well.

A ramp will be more faff to store, assemble, nail to the flying field and the model has to be well above flying speed at the end of the ramp to avoid prop strikes.

 

Dolly tests with the funfighter that has more than enough power to self launch displayed very aggressive swing to the left and uncontrollable unless a steering wheel was used. I tried 2 wheels at the front and one at the back as it stopped the "Reliant Robin" roll over effect. I also ended up with the aircraft as low as possible on the dolly to lower the over all C of G and resist it rolling over. Once the model is up to speed and accelerating then it lifts off promptly..

IMHO you have plenty of power and should not have too many issues with the left swing/roll problems so a dolly is the way to go. Bungies and lunch ramps just add faff and complexity with the ultimate issue of non release being the end of a very nice looking model.

Good luck and please keep us posted on progress.

PS - Good launches and not so successfully ones, but overall its been worth rebuilding it 4 times to be able to launch it in a reliable way. smiley

cal_0191.jpg _njt2130.jpg

PPS - I ended up with a peg between model and dolly with the Vulcan as the funfighters have a tendency to lift one wing and then induce massive yaw as one wing has the drag of the dolly and the other doesn't.

Edited By Chris Walby on 05/07/2020 07:36:52

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