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  #11  
Old 01-05-2011, 07:00 PM
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jharding58 jharding58 is offline
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Yep. Put the thrust ring in E territory and use a long hook. If you want to try a standard D motor you can always use a 1" spacer.
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  #12  
Old 01-05-2011, 07:37 PM
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Quote:
Originally Posted by Bill
I would not recommend a D12-3. From the teach a man to fish department, it is good to see what the experiences of others are http://www.rocketreviews.com/review..._saturn_v.shtml


Quote:
Originally Posted by jharding58
Yep. Put the thrust ring in E territory and use a long hook. If you want to try a standard D motor you can always use a 1" spacer.

Bill and jharging58.........That was kind of the point of my question. If I am reading things correctly several folks have used an Aerotech E15-4W single use motor very successfully. Please forgive me, but I am a bit confused here.....the Aerotech E15-4 motor is 2.75 inches long, the same as the Estes D12-3 right? (The Estes E engine is longer, but I think I have been warned _never_ to use the Estes E engines in these rockets.) So a stock build (for D power) of the Estes Saturn V and/or the Semroc Saturn IB should be all set to use the E15-4 single use motors from Aerotech, right?
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Old 01-05-2011, 08:06 PM
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The problem with using a thrust ring at 2.75" in a 24mm tube is that you limit your options. If you use a 3.75" placement of the ring in the stock 24mm tube then you can use both E motors in the 3.75 casing, as well as E motors in the 2.75 casing. As for never using an E - well, there are opinions.

The thing is that you can use the kit parts and simply add a 3.75" hook to provide the greatest options in 24mm casings.

An observation - if you have not yet assembled the capsule; purchase the 1/100 BPC from Sirius rocketry and the 1/100 service module decal from Sandman. Then your Apollo capsule and LES will look a lot more prototypical.
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  #14  
Old 01-05-2011, 08:19 PM
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That was the Estes E9 that I (we) were warned against. What is your view?

If I build stock with the "D" motor mount, can you tell me what choices I will have? Thanks if you can, OK if you can't.

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Old 01-05-2011, 08:37 PM
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Quote:
Originally Posted by UCBadger
Bill and jharging58.........That was kind of the point of my question. If I am reading things correctly several folks have used an Aerotech E15-4W single use motor very successfully. Please forgive me, but I am a bit confused here.....the Aerotech E15-4 motor is 2.75 inches long, the same as the Estes D12-3 right? (The Estes E engine is longer, but I think I have been warned _never_ to use the Estes E engines in these rockets.) So a stock build (for D power) of the Estes Saturn V and/or the Semroc Saturn IB should be all set to use the E15-4 single use motors from Aerotech, right?



Right and right.

I recommended against a single D12-3 because it will only get you up about 100 feet - not much time for the parachutes to open on an expensive rocket, both in purchase price and build time. An Estes E9 is a disaster in a Saturn V because even though it has more total impulse than the D12, it does so at a lower thrust (for a much longer burn.) Your rocket will not be going fast enough to be stable when it leaves the launch rod.

Confusing, I know, but you will soon become familar with motor thrust curves.

If you build the mount for 2.75" motors, you will have ample choices in AeroTech motors, both single-use and reloadable. But an "E" mount will allow you to also use the longer motors AeroTech is now selling.


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Old 01-05-2011, 09:04 PM
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Thanks for the info and the suggestions.
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  #17  
Old 01-05-2011, 09:43 PM
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BTW - this model has also been flown on the E-18. If you want to go that route you may want to consider using epoxy on the thrust ring and doubling them. Belt and Braces sort of thing.
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  #18  
Old 01-05-2011, 09:58 PM
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Well, I guess that brings us back to my original question. What motors can I use (Other than the Estes D12-3) in either the V or the IB without changing the build (much...I am OK with using the 3.75 in motor mount)? I want successful flights, keeping the thing in sight and whole.
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  #19  
Old 01-06-2011, 09:48 AM
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Quote:
Originally Posted by UCBadger
Well, I guess that brings us back to my original question. What motors can I use (Other than the Estes D12-3) in either the V or the IB without changing the build (much...I am OK with using the 3.75 in motor mount)? I want successful flights, keeping the thing in sight and whole.



It sounds like we're in the same boat. I posted yesterday about the Aerotech E's (15, 20, & 30) in single configuration. According to the curves and sim data, it should push the Saturn V to just under 500', which is what my ceiling is due to my field. My question was regarding recovery charge delay times based on the coast time projections. The other advantages I saw was these motors were fairly affordable and won't require too many modifications.
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  #20  
Old 01-06-2011, 12:27 PM
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Quote:
Originally Posted by jharding58

... An observation - if you have not yet assembled the capsule; purchase the 1/100 BPC from Sirius rocketry and the 1/100 service module decal from Sandman. Then your Apollo capsule and LES will look a lot more prototypical.



Thanks for the tip.

It's interesting to note how much the Apollo 11 CSM changed from pre-launch prep to launch.

Greg
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