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  #61  
Old Yesterday, 05:00 AM
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blackshire blackshire is offline
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Quote:
Originally Posted by BEC
Several things:

Jason - Yes, it IS BT-50. The body tube is pearly white (like Alpha VI) and is the same part as used on the Ghost Chaser. I'm actually thinking the nose cone/camera would be fun on a Multi-Roc....
Thank you for this information.
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  #62  
Old Yesterday, 05:24 AM
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Quote:
Originally Posted by BEC
I went back and rewatched all six videos from yesterday. One of the C6-5 flights (the one that weathercocked the most) actually got all the way over the top before ejecting. All the others were early, with the model still vertical on the way up on the C5-3 flight (not surprisingly). So yes, some longer delays will be worth a try.

I figured out that a 'chute shroud line got caught on the plastic shock cord mount inside the model which kept the 'chute from getting out on its last flight last night. That's why it got crunched falling from 660 feet up. Added: See picture attached.

I will replace the body tube with some BT-50 (or maybe ST-9) from parts on hand and it will fly again soon.
If you plan to use that plastic shock cord mount again (although there's no need--Roy Houchin kindly demo'ed a replaceable shock cord anchor that I designed https://www.apogeerockets.com/educa...wsletter231.pdf , and Chris Michielssen developed an easy-to-rig variation for Kevlar shock cords: https://www.apogeerockets.com/educa...wsletter338.pdf ), packing the 'chute in a slick-fabric deployment sheet or bag (like a sheet of Teflon, say) would facilitate it slipping past the plastic anchor at ejection.
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Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see:
http://www.lulu.com/content/paperba...an-form/8075185
http://www.lulu.com/product/cd/what...of-2%29/6122050
http://www.lulu.com/product/cd/what...of-2%29/6126511
All of my book proceeds go to the Northcote Heavy Horse Centre www.northcotehorses.com.
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  #63  
Old Yesterday, 11:00 AM
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Quote:
Originally Posted by Royatl
is the speed gauge in MPH or FPS ?

The data input to it is feet per second (that's what comes off the FlightSketch Mini). RaceRender is all about miles per hour but it doesn't really (so far as I can figure out) actually know units of what you feed the gauge.

I can't figure out how to get it to read a negative speed, though.... descent rate on that flight was ~8 fps. The 15 inch 'chute opened pretty nicely.

Jason - I've replaced the body tube as I mentioned I would a few posts back, and for the shock cord mount I used what is my current LPR/MPR standard: a length of Kevlar in a good old tri-fold mount and then the kit's shock cord tied to that. Hopefully sometime this week I'll get to fly it again.

I was even able to get the sticker off the crunched body tube and reapply it - it's not ugly from 15 feet away.

Also in the rebuild I was more careful putting in the static port holes so there shouldn't be a weak point in the tube there as I did with the original.
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Last edited by BEC : Yesterday at 07:25 PM.
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  #64  
Old Yesterday, 12:07 PM
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I got one yesterday, (I advise against going to a target that is reporting ‘limited stock’, instead, at stores showing actual stock, order and pay online and pick it up).

Here is a picture of the tube, as with many of Estes E2X kits going back years, there appears to one thin brown inner layer and a single thicker color layer on the tube. The spirals on the inner wrap are huge, so the tube is not as strong as I would like. The picture shows the tube is one layer in the spiral. I also attached a pic of the parts that come in the kit minus the launch equipment.
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Last edited by 5x7 : Yesterday at 12:33 PM.
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  #65  
Old Yesterday, 06:49 PM
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Quote:
Originally Posted by 5x7
I got one yesterday, (I advise against going to a target that is reporting ‘limited stock’, instead, at stores showing actual stock, order and pay online and pick it up).

Here is a picture of the tube, as with many of Estes E2X kits going back years, there appears to one thin brown inner layer and a single thicker color layer on the tube. The spirals on the inner wrap are huge, so the tube is not as strong as I would like. The picture shows the tube is one layer in the spiral. I also attached a pic of the parts that come in the kit minus the launch equipment.
You know for a beginners kit I think the completed rocket looks really good. The decal looks pretty cool too.
You’re right though the airframe could be a bit stronger.
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  #66  
Old Yesterday, 07:16 PM
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Quote:
Originally Posted by snaquin
You know for a beginners kit I think the completed rocket looks really good. The decal looks pretty cool too.
You’re right though the airframe could be a bit stronger.


Even though the current color wrapped bt-50s are weaker than I would like, I think it looks great, I like the decor, although it would be fun to do it as a downscale Cineroc. I don’t like stickers but when handled carefully they can look as good as decals. I have sprayed the airframe with two coats of old Krylon crystal clear which will allow me to use water with a drop of soap to position the decal.
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  #67  
Old Yesterday, 11:45 PM
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And today I got the free pack of B6-4s in the mail. Shipped Wednesday, here Monday. Not too bad USPS.
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  #68  
Old Today, 12:22 AM
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Further updated video with speed graph that actually shows descent rate, as well as total Gs off the FS Mini here: https://youtu.be/mCPeMb1d6dI

I may get to go flying tomorrow. If so, I'll try again for C impulse videos without tangles and crashes. If it's calm enough, I'll try a Q-Jet C12-6, which should take it up to ~850 feet.
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