F-Motor Record???

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Jordz
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Re: F-Motor Record???

Postby Jordz » Fri Oct 21, 2016 11:10 pm

Im by no means an expert on the subject, but i though fibreglass was fiberglass regardless of brand. The only thing that differs is the GSM and weave? In my understanding the resin you use, and the proportion thereof, is the real thing to take into consideration. Happy to be corrected if anyone knows better though.

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Re: F-Motor Record???

Postby jhurst7 » Sat Oct 22, 2016 7:41 am

After some research, I found it was 175 GSM, however, I couldn't find any information about the weave.
I had a look on the website and it looked like plain weave, but I could be wrong.
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Happy Heyoka
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Re: F-Motor Record???

Postby Happy Heyoka » Sat Oct 22, 2016 12:53 pm

jhurst7 wrote:Has anyone used the Microbeacon before? I saw it on Lister's 24mm MD, so does anyone who did anything over there know how well it would be able to be heard from a distance?


I also built him a little (7)555 based circuit... not sure if it's been flown. Of the top of my head it was about $10 worth of parts. It is quite loud and the timer is to make it "warble" so that it doesn't disappear into the background like a continuous tone can if you're unlucky.

of course you could make the circuit smaller but the main constrain is a buzzer that is loud enough - there's a minimum size below which it would be annoyingly loud in a room (eg: computer) but totally inadequate out in the open.

fyi:
20160413_221617.jpg
potted, ready to fly

20160407_111227.jpg
untrimmed, unpotted

lukes buzzer_crop.jpeg
basic circuit, R&C calcs
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Re: F-Motor Record???

Postby jhurst7 » Sat Oct 22, 2016 1:18 pm

Ok, that's pretty interesting.

I've just realised, I haven't factored into my simulations a launch button/rail.
Is there some way to launch without one of these as they seem to take off quite a bit in total height?
I was thinking something like 4 bars arranged around the rocket to guide it when it takes off.
Any suggestions would be great.

Thanks

-James
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Re: F-Motor Record???

Postby OverTheTop » Sat Oct 22, 2016 2:01 pm

Just search for "tower launcher" here and/or in google.

You find things like this:
viewtopic.php?f=9&t=5472

Fly-away rail guides are trending currently also...
viewtopic.php?f=9&t=5079
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Re: F-Motor Record???

Postby jhurst7 » Sat Oct 22, 2016 5:43 pm

OverTheTop wrote:Just search for "tower launcher" here and/or in google.

You find things like this:
viewtopic.php?f=9&t=5472

Fly-away rail guides are trending currently also...
viewtopic.php?f=9&t=5079


Perfect! Thanks OTT.
I saw those fly away guides, but I thought they were launch rails built into the rocket!

I think I'll go with making my own launch rail, mainly because I'm worried about the extra friction from the guides slowing down the rocket off the rail, and also because it will take a while making/getting shipped the rail guides.

Does anyone know if this is allowed at QRS, it's only an F....

Also, how difficult is it to program a Stratologger to do something simple like record the flight and deploy the parachute at apogee?
I've never worked with electronics before.

Also, just with Happy Heyoka's reply, I was just thinking of using the stock standard 9V battery offered on the website, and using a separate battery for the Stratologger, with this battery, how far away could it be heard?
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Re: F-Motor Record???

Postby OverTheTop » Sat Oct 22, 2016 6:43 pm

Don't worry about the friction of the rails in a tower. Here's why:

Friction force F = u N
u = coefficient of friction (depends on two rubbing materials)
N = normal force (the force at right-angles to the rubbing surfaces)

Since the rocket is vertical (ish) then there is almost no sideways force on the rails. So F (resultant friction) is negligible.

If you put buttons on the bird you pay the drag penalty for the entire flight. :(

Usual preferences are:
1 Tower
2 Fly-away guides
3 Rail
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Re: F-Motor Record???

Postby jhurst7 » Sat Oct 22, 2016 7:13 pm

I don't mean the friction from the rail, I mean the friction from the guides trying to separate, from the rubber band, making it stiffer on the rail. It's negligible but its still there.

https://www.youtube.com/watch?v=A55XcKfyhe0
This video says something about the stiffness, it's made by the guy who invented it for AMW.
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Re: F-Motor Record???

Postby air.command » Sun Oct 23, 2016 10:54 am

jhurst7 wrote:Also, how difficult is it to program a Stratologger to do something simple like record the flight and deploy the parachute at apogee?
I've never worked with electronics before.


It's really easy to use the stratologger, and there really is no need to program anything. Straight out of the box it comes configured pretty much for what you intend to do with it. Which stratologger were you intending to use? We've recently started using the CF version. (http://www.perfectflite.com/SLCF.html) and are quite happy with it. You would want to get the USB data transfer kit as well which makes it easier to configure the altimeter from a computer. You really just need a battery and a switch and then connect your ejection charge to the Drogue output which fires at apogee. It has a built in siren that will sound after landing, but I am not sure of the range of that. After landing you can download the altitude data as well as velocity, temperature and battery voltage.
During testing I found it convenient that you're able to fire the ejection charge via the software (via the USB cable) without having to put the whole thing inside a jar and simulating a flight by pulling a vacuum on it.

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Re: F-Motor Record???

Postby jhurst7 » Sun Oct 23, 2016 5:18 pm

I am using the CF version of the Stratologger.

Does anyone know if the Microbeacon would be louder than the stratologger or should I just use the Stratologger?
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Re: F-Motor Record???

Postby Oldboy » Mon Oct 24, 2016 11:46 pm

Just build something .
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Re: F-Motor Record???

Postby SpaceManMat » Tue Oct 25, 2016 9:11 am

My experience with beeper is that they are not terribly effective. You will almost always see your rocket long before you hear it. If you cannot see because it is hidden then you have to get quite close to be able to hear it. Of course whatever is hiding it will also block some of the sound. If your altimiter has an in built beeper that's fine, if not I would not bother.
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Re: F-Motor Record???

Postby jhurst7 » Tue Oct 25, 2016 7:51 pm

I started fiberglassing my body tube tonight.
We'll see how it turns out tomorrow.

Does anyone have any suggestions for tracking?

At the moment, I'm thinking of having a person downwind and then we both track it with binoculars, that way we could track where it comes down and hopefully find it.

Most of the radio trackers I've seen are too big to fit in a 24mm tube.
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Re: F-Motor Record???

Postby jhurst7 » Tue Oct 25, 2016 8:16 pm

I couldn't get the photo up before, hopefully this helps.
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Re: F-Motor Record???

Postby vance2loud » Tue Oct 25, 2016 9:04 pm

viewtopic.php?f=32&t=4805

viewtopic.php?f=32&t=5240&start=30

there's 2 GPS trackers on this forum that will fit into a 20mm tube,
there would no doubt be others available.

If you look into falconry you will find a lot of different Radio Frequency Direction trackers that are even smaller.
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