Suggestions for best lightweight rocket for an A8-3 motor?

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lucifer911
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Suggestions for best lightweight rocket for an A8-3 motor?

Postby lucifer911 » Thu Sep 17, 2015 12:21 pm

Looking for the lightest rocket which has the best altitude on A8-3 / B6-4 motors.
Does anyone have any suggestions besides the Estes Firestreak?

Preferably something that comes with decals and can be assembled very quickly.

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Re: Suggestions for best lightweight rocket for an A8-3 moto

Postby OverTheTop » Thu Sep 17, 2015 12:40 pm

Normally the terms "lightest" and "highest" are not in the same rocket. A light rocket will fly fastest, not highest. A rocket of just the right weight will fly the highest. It is a combination of how much energy is lost to aerodynamics and how much inertia the bird has. Sims allow you to work out the optimum mass for the flight if you want max alt.
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Re: Suggestions for best lightweight rocket for an A8-3 moto

Postby vance2loud » Thu Sep 17, 2015 12:57 pm

The firestreak won't take that motor, it takes the 13mm A3 or A10 motors. For the A8 I would possibly look at something like the estes wizard style rockets. Basically a 18mm bt20 body tube, nosecone and 3 fins. Play with similar designs in openrocket remembering to add an engine block which you can make from a short piece of used motor and your parachute.
I have played with a few designs like this and once proven in sims then with an A8 motor I have then checked the sim for a C6 and have seen actual flights of around 2000 feet.
Small basic minimum diameter rockets like that will quite often surprise you with the altitude that they can reach. If going for a C6 flight consider packing some talc powder to make it easier to see when the ejection charge ejects the chute (make sure it is talc or chalk and not flammable like a lot of flours).
http://openrocket.distrib.free.fr/index.php?option=com_content&view=article&id=20&DesignDir=distrib%2FEstes&Itemid=15&lang=en contains some of the sim files for the estes kits to give you a bit of a headstart. Then once you start building weigh bits as you go to keep the simulation accurate.
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Re: Suggestions for best lightweight rocket for an A8-3 moto

Postby Lister » Thu Sep 17, 2015 1:36 pm

I was looking into getting some powdered pigment to mix with talc to make coloured tracking powder.. might be easier to see up high as there wont be able to fit alot of powder in a rocket that size.

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Re: Suggestions for best lightweight rocket for an A8-3 moto

Postby lucifer911 » Thu Sep 17, 2015 2:09 pm

I ordered the Estes Alpha III - http://www.estesrockets.com/rockets/e2x/alpha-iiir

Recommended Engines: 1/2A6-2, A8-3 (First Flight), B4-4, B6-4, B6-6, C6-5, C6-7

It doesn't say whether it needs an adapter to use the 1/2A6-2 motors but I don't have those motors on me anyway..
it seems to be a nice rocket which I can assemble very fast without needing to paint or anything.

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Re: Suggestions for best lightweight rocket for an A8-3 moto

Postby vance2loud » Thu Sep 17, 2015 2:14 pm

Tempera powdered paint is another common tracking powder and can be found in 1.5kg packs for around $40 and should last quite a while. Some people use builders marking chalk but you have to be aware that some coloured powders will permanently stain your rocket and parachute, most notably the weather resistant builders chalk is apparently very difficult to wash out.

Another suitable kit for an A8 motor is the junior from Ausrocketry http://ausrocketry.com.au/junior.html
The 1/2A6-2 is an 18mm motor so doesn't require an adapter, but you should be fine on the more common motors.
The sim for that model is hopefully in that link that I posted earlier so just update (override) the weights with what yours weighs and you will be good to go with your sims as well.
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Re: Suggestions for best lightweight rocket for an A8-3 moto

Postby Viking » Thu Sep 17, 2015 3:15 pm

Another option is the Estes Viking(originally a Centuri model)
It is a minimum diameter model(BT-20) and works well on the A8's.
Fins are customisable. 3 would of course have less drag but I'm a fan of how the standard 5 fin version looks.
The current version with yellow paint scheme and green stickers(eww) is a but sucky though.
Still worth considering if you want something different to the Alpha to burn the A8's in, should go a few feet higher too, being min dia.
If you can print decals you could clone one of the older versions, or even kit-bash a Centuri Vector V with the addition of a transition and suitable sized lower body tube(same fins and nose)

Photo's are: current estes on the left, original Centuri version in the middle, original Estes version on the right from their 1988 catalog.
Viking.jpg
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Vector V.jpg
Vector V.jpg (109.79 KiB) Viewed 1087 times
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Re: Suggestions for best lightweight rocket for an A8-3 moto

Postby Lister » Thu Sep 17, 2015 4:34 pm

It tells you how to build those rockets in one of the estes guides from the 70's that vance gave lucifer the link for a few days ago.. I have a printed copy.. very usefull. Even tells you how to swing test a rocket

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Re: Suggestions for best lightweight rocket for an A8-3 moto

Postby kopius » Thu Sep 17, 2015 6:10 pm

SCR Junior for the win: http://ausrocketry.com.au/kits/low-powe ... ior-1.html

An Alpha is 24mm diameter, so it wont perform as well as an 18mm rocket.

FYI 1/2A6 motors are 18mm.
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Re: Suggestions for best lightweight rocket for an A8-3 moto

Postby Lister » Thu Sep 17, 2015 6:22 pm

kopius wrote:SCR Junior for the win: http://ausrocketry.com.au/kits/low-powe ... ior-1.html

An Alpha is 24mm diameter, so it wont perform as well as an 18mm rocket.

FYI 1/2A6 motors are 18mm.

That would have to be your favourite rocket wouldn't it,

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Re: Suggestions for best lightweight rocket for an A8-3 moto

Postby Viking » Thu Sep 17, 2015 6:23 pm

For the win? I propose a Junior vs Viking drag race!

Nah, I get what you're saying :D
For the price and ease of construction, it can't be beat.
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Re: Suggestions for best lightweight rocket for an A8-3 moto

Postby Lister » Thu Sep 17, 2015 6:30 pm

I would like to see that race :)

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Re: Suggestions for best lightweight rocket for an A8-3 moto

Postby lucifer911 » Fri Sep 18, 2015 9:08 am

thanks I will add this rocket to my collection and another 56er soon.
I mainly ordered the Alpha III because it has nice decal and precoloured parts so I can launch it within minutes of receiving it :)

kopius wrote:SCR Junior for the win: http://ausrocketry.com.au/kits/low-powe ... ior-1.html

An Alpha is 24mm diameter, so it wont perform as well as an 18mm rocket.

FYI 1/2A6 motors are 18mm.


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