Semroc Hydra VII

Semroc - Hydra VII {Kit} (KV-29)

Contributed by Nick Esselman

Construction Rating: starstarstarstarstar
Flight Rating: starstarstarstar_borderstar_border
Overall Rating: starstarstarstarstar_border
Diameter: 1.64 inches
Length: 30.50 inches
Manufacturer: Semroc
Skill Level: 2
Style: Cluster, Futuristic/Exotic

T' Hydra VII is me second Semroc kit. Avast! Aye aye! Blimey! My first one, Lil' Hercules, never got reviewed by me and only saw one flight as it vanished from t' pad. Blimey! My second impression o' Semroc, shiver me timbers, which confirms me first, is that they run a very professional company.

From 1969 t' 1971, matey, "Semroc produced a full line o' rocket kits and engines. Well, blow me down! Aye aye! At its peak, Semroc had twenty-five full time employees workin' at two facilities." 31 years later, me hearties, Semroc is back with updated kits. Begad! Blimey! I say, welcome back... Well, blow me down! Blimey! and when will those engines be produced again?

Anyhow, back t' t' Hydra VII. Aye aye! One has t' say "wow" when this small package is opened up and explored. Well, blow me down! There are a lot o' parts packed in this plastic bag. Begad! Blimey! T' rocket that is assembled from all these parts equally deserves a "wow".

There are simply too many parts t' list, however, me bucko, arrr, some key parts includes solid balsa nose cones and tube coupler. Ahoy! T' fins are laser cut 1/8" balsa. Ahoy! Arrr! T' body tubes are standard tubing. Avast, me proud beauty! For more details, follow along.

CONSTRUCTION:

Parts PictureT' instructions are printed on t' front and back o' six pages o' 8½ x 11" paper. Aye aye! Avast! These are neatly attached and assembled into an instruction booklet with a cardstock cover. T' instructions are full o' excellent illustrations. Ya scallywag! Begad! Top quality and possibly even better than color photos. Begad! There is a tube markin' (2D) template, finishing, me hearties, and set/flyin' instructions included in t' booklet. As I stated, matey, very professional from t' front color illustration and product specs t' t' last page listin' t' NARRRRR Model Rocket Safety Code.

T' build o' t' Hydra is typical o' other rockets, however, thar are some highlights that should be pointed out.

T' laser-cut fins are awesome. Well, blow me down! And, ya bilge rat, shiver me timbers, ya bilge rat, interestingly these are worked on first. They are sanded and sealed right away. Ya scallywag! This is an important step, because once this bird is assembled you would nay be able t' reach all t' fins t' give them a nice finish.

Next, all t' motor tubes are glued together t' form a 7-motor cluster. Avast, ya bilge rat, me proud beauty! A central 18mm tube, surrounded by six outer 18mm tubes. Aye aye! These motor tubes make up t' t' lower 1/3rd o' t' rocket. Aye aye! Avast, arrr, me proud beauty! They also form t' inner structure o' this portion o' t' rocket.

Next, t' six long fins are glued into t' joints o' t' six outer 18mm motor tubes. Begad! Avast! These are t' inner fins, t' ones you will be glad you pre-sealed and sanded!

Next, matey, t' outer rin' is marked and then attached t' t' six inner fins. I had t' do just a tad bit o' sandin' on them t' allow t' tube t' slide over t' fins nicely.

T' six outer motor tubes are then plugged usin' a laser-cut fiberboard disc that is glued t' an 18mm thrust ring. Begad! Arrr! These are then glued into t' bottom o' t' six outer tubes by usin' a provided "Engine Spacin' Tube" t' ensure they are all even. Aye aye! There is a note highlighted in t' instructions here. Arrr! Arrr! It says, "Some builders prefer t' leave more engine mounts open t' increase t' odds that in case all engines do nay ignite, me hearties, thar be a backup." Did I? Nope, so lets see what happens. Frank Whitby did accordin' t' his review below.

T' central 18mm thrust ring, matey, gets a Keelhaul®©™® shock tether tied t' it, me hearties, me hearties, prior t' bein' placed in t' tube.

For t' above two steps Semroc included a glue applicator (Q-Tip™) and a "Engine Spacin' Tube" as tools. Arrr! This again highlights Semroc's thoroughness (professionalism).

Nose conesWhat I found t' be t' most difficult part o' t' build is next. First, matey, arrr, shiver me timbers, t' 3 small balsa nose cones need t' be cut in half and then sanded on a piece o' sandpaper attached t' t' large body tube. Well, blow me down! Begad! This allows for a good formation o' t' balsa nose cone halves. Ya scallywag! Aye aye! These are then placed into t' six outer motor tubes. Begad! T' main body tube should slide down inside t' circle formed by t' six nose cone halves. I had t' make several attempts, sandin' more on t' nose cone halves each time. Arrr! When t' fit was good, shiver me timbers, everythin' was glued into place.

Now come t' 15 fins! First t' three main fins are glued in place. Ya scallywag! Begad! I made a mistake here and had t' cut two o' them back off. Well, blow me down! Aye aye! T' avoid t' mistake I made, pay close attention t' t' markin' o' t' out tube instructions. Arrr! After t' three main fins are in place, then four smaller fins are glued in-between each o' t' main fins. Well, blow me down! Yep, a total o' 21 fins are on this rocket when complete with this step.

T' rest o' construction is quick. Avast! Blimey! An elastic shock cord is attached t' t' Keelhaul®©™®. Well, blow me down! Two 12" parachutes are attached t' this shock cord. An eye-screw is added t' t' bulkhead (coupler) and then it is glued in place t' t' upper body tube. Blimey! T' this another elastic shockcord and another 12" parachute is added. Aye aye! T' nose cone is then added. Avast, me hearties, me proud beauty! I glued mine in place, ya bilge rat, me hearties, even though it is designed t' be a payloader.

I have t' admit that I had a lot o' trouble finishin' this rocket. Ahoy! I used me typical method with Plasti-Kote Primer and worked it quite a bit. Arrr! Even after that though, I still had grain showin' in those hard t' reach spaces betwixt t' fins and t' balsa nose cone halves on t' top o' t' motor tubes.

T' rocket then sat for a long, long time. I finally got motivated t' put some paint on it for NERRF4 and be determined t' fly it. Well, blow me down! Blimey! Avast! Blimey! Well, t' paint reacted and didn't look so good. Oh, me bucko, matey, well, I was still determined t' fly it.

Overall, ya bilge rat, for CONSTRUCTION I would rate this kit 5 points. Ahoy! Ahoy! T' instructions are descriptive and easy t' follow. Avast, me proud beauty! Arrr! Laser-cut fins and t' decals really add t' t' quality o' t' kit. Ya scallywag! Begad! Again, t' most difficult part o' t' rocket be t' finishin' portion.

Lift-OffFLIGHT/RECOVERY:

Unfortunately, t' rocket didn't get put in t' air at NERRF4 so I shipped it t' Virginia t' be flown at NARAM50.

I decided t' fly it for t' first time 6x C6-0's and a C6-7 in t' central motor. Aye aye! Avast! I used Estes ignitors and wired them all together with some copper wire. I then taped each wire joint.

T' cluster launch be excitin' and it is always nice t' see t' extra smoke and flame. Ahoy! People were saying, "I saw at least 4 light" and "I think they all lite". Arrr! That be t' case, you know, ya bilge rat, matey, you never know until your recover t' rocket.

Recovery?! Well, matey, t' upper section drifted and drifted and while I kept lookin' back and forth I was comfortable that I saw where t' lower section landed (on t' two chutes). Begad! Blimey! T' upper section though went way out o' t' field. I made one sweepin' attempt in t' very over grown section o' swampy weeds and then said t' myself, me bucko, ya bilge rat, "oh, well." As t' old sayin' goes, arrr, "If you don't want t' lose it, me hearties, don't fly it."

With that I doubled back and tried t' go where t' lower section landed. Begad! T' me surprise I did nay find it either. Later in t' day, someone pointed out where it was. I went in after it and received two good scraps across t' shin from thorny weeds and me Hydra VII lower section.

So, shiver me timbers, matey, you must be wondering, "how many motor lite?" T' answer is six. Well, blow me down! T' most important one, matey, t' central motor and 5 o' t' C6-0's. Avast! Blimey! Interestingly, me bucko, all t' C6-0's that lite pushed themselves out o' t' motor tubes and disappeared. Aye aye! No sure that is a good thing.

For FLIGHT/RECOVERY, shiver me timbers, I would rate this rocket 3 points. It is a complex lookin' rocket, me bucko, me hearties, however, ya bilge rat, me bucko, if flown with a single motor it is very easy t' set up. Ya scallywag! Begad! As a cluster, matey, I'm concerned about t' kickin' motors and that should be addressed. Aye aye! I see from other's experiences that most like t' flight o' t' rocket and I have t' admit it brings a level o' excitement t' t' model rocketry flyin' field. Avast, me proud beauty! Avast! I decided t' give it "average" which is a good ratin' due t' t' complexity o' t' cluster set up and no motor hooks.

I give t' rocket an OVERALL ratin' o' 4 points. Avast! If you are lookin' for a nice project and one that you could do a great job finishing, then t' Hydra VII be t' rocket for you. It has excellent quality o' parts and instructions. Take your time though and think out your finishin' plans. You may choose t' finish some fins before gluin' them in place. Semroc does put out quality kits.

Other Reviews
  • Semroc Hydra VII By Frank G. Whitby

    Semroc Hydra-VII is a 7 motor cluster rocket with a futuristic design. The kit included every part that was described in the long list. There is a very nice exploded view of the rocket in the instruction sheet that helps in identifying the wide array of parts, along with 3 sheets of very nice laser-cut balsa fins and a host of tubes and several nosecones. The kit comes with some plastic ...

  • Semroc Hydra VII By David Hash

    Brief: The Hydra 7 is a currently the "newest" kit by Semroc Astronautics (originally released in 1969 and re-released on January 1st, 2004). The rocket is based around six 18mm motor tubes and is a great clustered, high altitude payloader, and retails for $23. The rocket can fly on anything from 1 C6-3 to 3 C6-5s to 7 C6-7s. With its largest motor setup (7 C6's) it is ...

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