Archive for Bill

Launch is scrubbed for February 10.

Unfortunately rain is predicted all day (Saturday, February 10) at our launch site and we are forced to scrub the launch. However, we have a scheduled another launch attempt for Saturday February 24. Hopefully we can get clear skies in 2 weeks.

George Gassaway Memorial Service

From the Birmingham Rocket Boys… George was an exceptional rocketeer and made numerous contributions to our hobby. A regular on the international team, he will be missed by those of us who knew him.

“Greetings BRB Club Members and Friends. As most of you know, back in May, we lost one of our Dear Friends and long time BRB Club Members, George Gassaway. While at home in Minnesota George succumbed to pancreatic cancer, but before he died he asked me to perform a memorial service for him here at his parents grave. After consulting with the Cemetery Officials, and BRB Officers, we have decided to hold a “Graveside Memorial Service” for George next Saturday, September 30th at 11:00 am. As an Ordained Minister and President of BRB, I will be officiating and conducting the Memorial Service which will be held at Forest Hill Cemetery, 431 North 60th Street (Birmingham, Alabama) 35212. I am asking all of our BRB Club Officers and Members to attend and am extending an invitation to George’s Friends to attend as well. In honor and tribute to George we will lay a special wreath on his parent’s grave, have a brief 40 minute Memorial Service which will include a prayer, scripture reading, testimonial and eulogy. For those of you who plan to attend I will permit you to sign your names in George’s Family Bible and to choose from a few of George’s personal rocketry collectibles to remember him by. The Forest Hill Cemetery can be seen from the Birmingham Airport Freeway Exit. Follow your GPS directions to the cemetery, enter the main entrance, go pass the office, pass through the main gate, turn right at the first road, proceed straight to the end of that road to section #34 where my White Silverado Truck will be parked at the Gassaway Family Burial Plot. Please join me and the Birmingham Rocket Boys as we pay our final Respects and Tribute to our Beloved Friend and Brother, George Gassaway. God bless you.
Ron”

No launch tomorrow (Saturday, February 18)!

Entire east side of the field is flooded and the road we normally use is impassible. West side of the field is a mudhole.

We encourage those with the urgent need or desire to fly (such as college/university teams) to consider attending tomorrow’s MC2 launch in Hopkinsville, KY. Yes, it’s a bit of a drive, but they have a fine field that is not next to a river – details/directions at https://mc2rocks.com. If you need to certify, please contact Allen Hall at jahalliv@gmail.com.

This is the rainy season for the Huntsville area, and we only manage 2-3 launches per season. Please avail yourselves of the launch opportunities provided by other clubs in our region.

Tomorrow’s (Saturday, February 11) launch is scrubbed!

Due to worsening weather forecasts starting in early afternoon, the officers have decided to cancel tomorrow’s launch. We are looking at the next Saturday (the 18th) as a possible launch date.

 

Mother Nature does not like us this time of year.

Learning to respect OpenRocket – thanks to NARCON!

Like many others involved with TARC, I’ve used OpenRocket for years – it’s easy to use, has a nice database and is quite suited for designing simple 3FNC or 4FNC rockets. But for more complex models – such as those with pods, “fins on fins” or elaborate clusters/stages, I use Rocksim. It can handle almost any design, plus you can easily adjust things like the rocket drag coefficient to match the rocket’s flight data. Couldn’t do that in OpenRocket 15.03, which is the last stable version, released almost 8 years ago.

Plus there’s the fact that OpenRocket uses JAVA, which often caused installation problems for users. Fortunately that changed when the developers created installers for the various operating systems (Windows, MacOS and Linux) that eliminated the need to futz with a separate JAVA installation. However, OpenRocket 15.03 uses JAVA 8 whereas modern operating systems have gone to JAVA 11; for example, Mac users running Ventura (the latest Mac operating system) can no longer run 15.03 because Ventura has no support for older versions of JAVA. The good news is that the developers have released a pretty stable beta version of OpenRocket (22.02.beta.05). It not only runs under Ventura and other operating systems, but also sports some new capabilities previously found only in Rocksim. I’m going to touch on a couple of these, the first being the ability to manually set the rocket’s drag coefficient.

After the Geezer TARC launch, I received the altimeter profiles from the flights of Duane’s rocket as well as a question – “Why are the OpenRocket simulations so far off from the actual flight profiles?” The answer is pretty well known – OpenRocket 15.03 controls drag by setting the “roughness” of the component surfaces, i.e., “Smooth Paint”, “Unfinished”, etc. It tends to underestimate drag of the components and the model as a whole, resulting in simulated peak altitudes that are too high, by a significant amount. In fact, we tell our TARC teams to try for simulated altitudes 100 feet higher than the TARC goal in order to compensate for this issue. However, the new 22.02 version of OpenRocket allows you to manually set the drag coefficients of the various parts, and I decided to test this against Duane’s flight data.

There are 5 curves plotted in the below graph. The 2 blue curves are the flight profiles from the onboard PNUT altimeters, whereas the red dashed curve is from a Rocksim simulation with the drag coefficient set to the standard 0.75. It tracks pretty well with the data. Note that the OpenRocket 15.03 curve predicts an altitude way too high, by about a hundred feet. But when I import Duane’s design into OpenRocket 22.02 and play with the drag coefficient, I get a nice performance match. The advantage in doing this is that I can now accurately estimate how this model will perform with different motors or weather conditions. And so can TARC teams with their rockets – without having to shell out the bucks for Rocksim.

Click to enlarge.

The other capability I learned from the NARCON talk is how to use pods and boosters. To test my knowledge, I created a simulation of the Estes Little Beth X-2, an old Design of the Month model that has a clustered (3 motors) lower stage with dual parachute recovery mated to a single motor upper stage. There would have been no way to realistically model this rocket in 15.03, but it was a snap to do in 22.02 – took all of 30 minutes. I was able to model all the rocket components and the simulation handled all aspects of the flight, including the booster parachute deployment from the side pods.

Little Beth X-2 modeled in OpenRocket 22.02.Beta.5               (Click to enlarge).

OpenRocket 22.02.Beta.5 Little Beth X-2 flight simulation           (Click to enlarge).

Very nice!

So please download the latest beta version of OpenRocket. While it doesn’t have all the capabilities of Rocksim, it is catching up thanks to a team of dedicated volunteer developers. Also, you can’t beat the price!

Link to OpenRocket 22.02.Beta.5: https://openrocket.info/downloads.html?vers=22.02.beta.05

Geezer TARC showdown…

 

Doug with his rocket

A few of us took advantage of the nice weather on Saturday to conduct this year’s long-delayed Geezer TARC flyoff at Pegasus field. It was the usual cast of characters – Doug, Duane, Vince and me, along with a few spectators. People began arriving at the field around 9:30; within half an hour the range was set up and ready to go.

Doug’s rocket heads up the rail

First off the pad was HARA President Doug Aguilar, flying his scratch built rocket with the Pringle’s can payload section. He chose an Estes E16-8 motor for his initial flight, which did not quite have the impulse needed to reach the 850 foot goal. The rocket only made it to 496 feet, and the 8 second delay – which would have been great if the rocket had made it to the goal – was too long, ejecting the parachutes when the rocket was speeding towards the ground. The parachute ripped away from the payload section, resulting in a disqualification. Fortunately, nothing was broken and the rocket was readied for its next flight.

Vince readies his entry for flight

The second flight was made by NAR advisor Vince Huegele, who had Frankensteined together a rocket from pieces of various kits – a tradition for him. His model featured the plastic egg capsule from an Estes Scrambler, connected to a 2 piece BT-56 body tube and 3 trapezoid fins scrounged from another kit. It was also the only rocket to use launch lugs. The lightest of the rockets flown at the launch, this classic-looking egglofter was powered by a single Estes E12-6 motor.

Vince’s rocket clears the rod

Upon ignition, Vince’s rocket left off the pad, soaring past the mark to 943 feet. Naturally, the rocket took a long time to descend to the ground, with the egg capsule touching down 77 seconds after launch, well outside the 42-45 second TARC duration window. Realizing he needed to add weight to the rocket, Vince spent quite a few minutes looking for a suitably sized rock he could use as ballast for his second flight.

The reigning TARC Geezer, HARA Treasurer Duane Mayer, was next. His rocket was a simple 3 fin BT-70 based model, using an Aerotech E18-7 reload for the motor. Duane’s years of experience showed as his rocket reached apogee at 865 feet, only 15 feet above the mark, and was slightly short on duration at 38 seconds, 4 seconds outside the window.This put him in the lead, but it was clear that the ejection charge fired late, causing the model to fall from apogee more than was comfortable.

The motor in Duane’s rocket ignites.

My flight was the last in the first round. My rocket, Oeuf, was a simple model using Semroc ST-18 body tubes (the smallest diameter that can accommodate a “regulation” TARC egg) and upscaled Alpha fins. I designed her to be versatile, so the motor mount was a four engine cluster, capable of handling 2 or 4 18mm motors. For this flight I decided to keep the “pucker factor” associated with cluster launches to a minimum and chose 2 Quest D16-6 motors.

2 D16 motors propel Oeuf into the sky.

Both motors lit, and Oeuf flew perfectly straight to a respectable 879 feet, with the payload section touching down in just under 42 seconds. However, the sustainer parachute did not leave the body and the lower part of the rocket came streaking in, burying itself to a depth of 5 inches in the soft ground of Pegasus field. So my would be score of 31.5 – which would have put me in the lead by one point – became a disqualification. Not only that, but the rocket was too badly damaged to fly again – I was done for the day.

The agony of defeat…

The 2nd round of competition flights was fairly uneventful – I watched as Doug swapped the Estes Estes E16-8 for an Aerotech F30-7, which pushed his rocket up to 925 feet. Way too high, but at least he made a qualified flight. Vince followed with his rock-ballasted egglofter, which reached a too-short 777 feet and stayed up way too long – the payload section parachute was too large. Duane’s second flight came last, hitting 880 feet and landing in 39.8 seconds, ensuring he would once again be crowned the TARC Geezer. Even though his final flight went higher, Duane did mitigate the too long ejection charge issue by drilling away some of the reload’s delay. He thought he shaved off 2 seconds, and the altimeter profile shows that he came near to that.

The victor!

Geezer TARC 2022-2023 was over. Once again, Duane took home the victor’s trophy and will have another year’s reign as the best TARCer. As for me, I got the Flying Pig award for the worst flight, which sits right next to my Skunk trophy awarded for worst flight at a past Geezer TARC. I came so close, but a stupid mistake – which I am too embarrassed to reveal – cost me my chance at TARC glory.

There’s always next year…

 

2022-2023 Geezer TARC scores (Click to enlarge).

No launch this Saturday (Jan 21)

Mother Nature is not giving us a break – due to muddy field/road conditions, this Saturday’s launch attempt is cancelled. Our next launch is scheduled for February 11.

Tomorrow’s (January 14) launch is scrubbed!

Due to weather and conditions on the ground, the officers have decided to scrub Saturday’s launch. There will be no launch on Sunday, and we are looking at the forecasts for alternative dates this month. Please monitor this website, the HARA Facebook page or the HARA mailing list for updates.

Launch update – Friday, April 8

Tomorrow’s launch is Go!

We will be using the Jackson 5 field – directions at http://hararocketry.org/hara/monthly-club-launches/

HARA’s last launch of the 2021-2022 season is Saturday April 9!

HARA will be hosting the last launch of its 2021-2022 flying season this Saturday, April 9 starting at 10 AM. Details and directions are here.

Some additional notes:

  1. There will be no on-site vendor (Chris Short will be at Argonia), so bring all necessary stuff with you or make arrangements in advance with respect to motors, etc.
    2) Field selection (Jackson 5 or Butler Mill) will be made late this week. Choice will depend on conditions after Wednesday’s rain.
    3) Groups, please coordinate certification/test flights with the HARA officers before showing up on the field.
    4) As always, help setting up/tearing down the range is greatly appreciated.

See you at the field on Saturday!