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A few more various Ecee Thunder flight video's.
Dave F.
Impressive, especially Ari's flight. The 1st one looked kinda painful though.
Wonder what these Thunders tipped the scales at?
A few more various Ecee Thunder flight video's.
Dave F.
Mine is 8.7 oz (bare balsa).Wonder what these Thunders tipped the scales at?
Thanks for that benchmark. Hopefully can get to weight mine in a few days.Mine is 8.7 oz (bare balsa).
May have to resort to this option if the nylon hinges start to loosen. For now I'm trying to minimize even small weight increases since I had to add 12.08g (about half oz) of trimming weight to get the CG where it needs to be.Sewn in tape hinges have worked well for me for last 8 years. They cost next to nothing, weigh next to nothing, and if done right the balsa will break before the hinge does.
See posts 7-10
https://www.rocketryforum.com/threads/dandelion-seed-helicopter-build-thread.33004/#post-306474
Thanks appreciate that. Part of the enjoyment was the build of this classic original. Will probably get some snaps of the Thunder sometime today.Very nice work.
FWIW, I used CA hinges on mine, which are much lighter and better centered than these. It's quite easy to cut the slits for the hinges given the thickness of the canard balsa. First item on https://www.greatplanes.com/accys/gpmq3950.phpEpoxied the Du-bro hinges in place...
Always assumed references to "CA hinges" meant the usual Du-bro variety but now I understand it's a hinge designed to absorb cyanoacrylate better, so thanks for url. Will switch to these for future builds.FWIW, I used CA hinges on mine, which are much lighter and better centered than these. It's quite easy to cut the slits for the hinges given the thickness of the canard balsa. First item on https://www.greatplanes.com/accys/gpmq3950.php
Thanks! Hoping for just that result when I get to fly this hopefully in September at a large (3,800 acre) field. If all goes well I'm also hoping to get some footage...or at least some stills.Straight trails!
Finally found some time to sew in the Thunder's canard flaps. Haven't had a chance to test fly it yet due to uncooperative weather conditions, but at least now I won't have to worry about the hinges coming loose.Sewn in tape hinges have worked well for me for last 8 years. They cost next to nothing, weigh next to nothing, and if done right the balsa will break before the hinge does.
See posts 7-10
https://www.rocketryforum.com/threads/dandelion-seed-helicopter-build-thread.33004/#post-306474
Glad to know that this thread served as a catalyst to get another one of these impressive gliders back into the skies. Would enjoy seeing your build/launch/flight pics here.Hi Eric --
Just found your thread on the EceeThunder - my all-time favorite rocket glider!
I have built and flown (and crashed) 3 of these magnificent boost gliders over a period of say 10 years. They were great flyers once all dialed and real crowd pleasers. The last one crashed in 2016 due an overly energetic E12-4 ejection charge which damaged the canard actuator. It never transitioned to glide mode and came in hot and fast -- hitting a rock (of course) on landing thus ensuring total destruction.
But in an incredible stroke of good fortune, in 2017 I was able to buy (on Ebay) another one in a sealed bag. Thinking it was perhpas the *last* unbuilt Ecee Thunder in existence, I never wanted to build it until I figured out how to scan all the parts for posterity. And here you have done just that. Now I'm going to start building the kit this weekend!
Many Thanks,
Kevin.
Great idea about using the pins to hold down the forward compartment cover. Wish I hadn't glued mine down.Yes, I'll post some photos when I get started (soon!)
Excellent job with your build, and good improvements. Especially enlarging the ejection gas hole and positive motor retention. The Thunder is very sensitive to fore & aft balance so keeping the motor retained is critical. Kicking the motor makes the glider nose-heavy resulting in a steep, fast descent (w/ damage on impact) instead of a nice graceful glide.
I used an Estes 24mm motor hook with the forward tab ground off (so either D12-3 or E12-4 motors could be used), attaching it to the tube with a dab of JB weld. Worked great. And tape ring for fwd retention.
I saw your motor retainer -- looks good and secure. If you haven't already done it, check how it affects the fore & aft trim. It may need added nose weight to get it to trim at the balance point marked on the underside of the fuselage. Always install an empty motor case adjusting the fore & aft trim.
My previous builds always took 1/4 to 1/2 ounce in the nose compartment to trim out perfectly. I use short pins rather than glue to attach the top piece of the nose compartment so I can add or remove small amounts of weight in there for D v.s. E motors. And to re-trim after (the inevitable) repairs!
Also how do you deal with the balsa piston getting "frozen" in place from the heat and crud from the ejection charge? Yesterday I flew my 13mm Ecee and another glider that also uses a balsa piston and both jammed their pistons in place because the heat tends to make them swell. I was thinking about replacing the balsa with a coupler with plywood discs glued to both ends.
I coated the ejection-facing end of my balsa piston with JB Weld and it kept it from completely disintegrating, but it seems enough heat percolates through to cause swelling. While a fiberglass coupler would be an excellent fix, unfortunately I don't think Mach 1 has a 24mm coupler size. I've never worked with fiberglass BTs before so I'm not sure if a glass body tube could be used instead, with a piece sliced out longitudinally and the tube reglued (reglassed?) perfectly round again so it slip fits snugly inside the 18mm paper motor tube. Maybe it's easier than I imagine. If so it would be the ideal solution since it's so heat-resistant.Eric,
That's an interesting idea . . .
I am pondering about being able to "fire-proof" the Plywood Disc by coating it with a thin layer of JB Weld ( good for 600 deg. F ) epoxy. JB Weld can be thinned with Acetone.
There is also the possibility of using a Composite coupler, in place of a "paper" one . . .
https://www.mach1rocketry.com/fiberglass-airframes.html
Dave F.
I coated the ejection-facing end of my balsa piston with JB Weld and it kept it from completely disintegrating, but it seems enough heat percolates through to cause swelling. While a fiberglass coupler would be an excellent fix, unfortunately I don't think Mach 1 has an 18mm coupler size. I've never worked with fiberglass BTs before so I'm not sure if a glass body tube could be instead, with a piece sliced out longitudinally and the tube reglued (reglassed?) perfectly round again so it slip fits snugly inside the 18mm paper motor tube. Maybe it's easier than I imagine. If so it would be the ideal solution since it's so heat-resistant.
As an experienced Ecee Thunder flier do you think that a D12 is adequate to loft my 9.8 oz. Ecee high enough to safely deploy the canard flap?
Also how do you deal with the balsa piston getting "frozen" in place from the heat and crud from the ejection charge?
I like your idea of coating the aft end of the piston with JB-Weld. I'm adding that to my build!
That's awesome! Seemed odd that they wouldn't have 'glass couplers, this makes much more sense. This is a great solution to the bothersome problem of short-lived balsa pistons. Thanks Dave, much appreciated! I'll be on the lookout for those couplers.Eric,
I was on the phone with Steve Skinner ( a really nice guy ), from Mach 1 Rocketry, for almost 2 hours today.
Among the many topics of discussion were their 18mm & 24mm FG tubes . . . They DO have Couplers and the website will be updated soon !
Dave F.
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