6.6M HKM Nimbus 4 - yet another one takes to the wing - RC Groups
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Jan 17, 2011, 05:25 PM
Team JR Air
SPasierb's Avatar

6.6M HKM Nimbus 4 - yet another one takes to the wing

Not a new subject, but it's been quite some time so I thought I'd share a little bit of putting together my HKM Nimbus 4 this afternoon.

I dearly miss my 5 meter one (serious seller's regret) and really liked seeing Hans Weideker fly his at LASS last spring so I had John at HKM USA exchange that balance in my account for some fiberglass and bring one along to the JR Aero Tow last June (where I believe Tom Kallevang was also flying his). This bird has sat too long so time to put it together for the upcoming season.

Since seeing servos going into wings is the hobby version of watching paint dry, I'll spare us all that tedium. There really isn't much news in this very nice kit. Scale is 1:4 making total span 6.6M. Each wing is a short root panel with flap and airbrake, then a big honkin` rectangular joiner, the outboard panel is two ailerons and finally short tips put an end to things. Center joiner is a large steel rod.

One thing I did today was attack the really basic seat pan. It's none too impressive and looked sad lying in the bottom of the fuselage. These photos show adding "LET style" supports, dressing it up with parts from the scrap bin and getting the rudder and elevator sorted.

I'm very interested in people's impressions of flying this bird, so please share anything here. I know Len Buffinton still has his for sale and having seen that one fly and taking a short turn at the sticks, I can highly recommend it now that it's "too small" for Len.

More to come. Let the sharing begin...
Last edited by SPasierb; Jan 17, 2011 at 05:32 PM.
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Jan 17, 2011, 05:32 PM
Registered User
beautiful workmanship!!! love the seat!
Jan 17, 2011, 05:50 PM
Pete Beadle's Avatar

Nimbus 4

Hi SPasierB

Lovely to see a build from the seat up....

You ask about flying qualities.... I have the Icare/Icarus 5.2M version not the beautiful single seater HKM you have but feel I can comment just a little,, if I may?

I haven't aerotowed mine yet but have sloped it. Absolutely realistic and a really ladylike performer in two-seat guise. Keep the speed up and everything tucked away on the wing and the hiss as she goes by is 1:1!
Chandelles are my speciality - low G and high oooh factor! It's my intention to mount a GoPro on mine later this year - I'll post the vid soon as.

I don't want to hi-jack this thread but, anyone out there got the 5.2M version so WE can compare notes as well?

Anyway, I've enjoyed the first instalment of the fit-out, please keep 'em comin'

Jan 17, 2011, 06:31 PM
Team JR Air
SPasierb's Avatar
That's the one I had. Absolutely loved it. A great flying airframe, indicated lift just great and the wings made that nice Nimbus curve when you wanted.

I'm hoping this one serves me as well!

Jan 17, 2011, 07:06 PM
LSF303-AMA Fellow
tkallev's Avatar

If I didn't love it, would it be my avatar?

Fly it like you would if your butt was in the cockpit and she handles wonderfully.

I absolutely love mine, coupled with the 12X and it's everything I could want in a scale model ... mine has flat basic/basic cockpit (no pan), I finally glued a head in there so she isn't a pilotless RPV anymore, but you've done a great job with the cockpit pan.

With flap/spoiler mixing in landing mode, there is NO elevator compensation needed. She isn't an aerobat, I've kept mine right side up the whole time altho the video shows an inverted pass ... that just isn't scale to me

I'm sitting here trying to remember all the mixes and such ... I do run the spoilers on Matchboxes to leave me a channel for the vario, and the tow release is a separate channel, not ganged with anything else.

Have any specific questions I can help you with?

Jan 17, 2011, 07:44 PM
Registered User
Steve this is another sweet build!!! Bring it on......
Jan 17, 2011, 07:59 PM
Registered User
yyz's Avatar
Structural (S) glass for the seat pan reinforcements! Is Elvis gonna be flying this ship?

Lovin' the red velvet interior. Nice work,


ps: I have the baby (6m) Tangent version on the board right now.
Jan 17, 2011, 08:34 PM
Registered User
eschlitzkus's Avatar
I love the ball links you are using. What type are they?
Jan 17, 2011, 09:57 PM
Team JR Air
SPasierb's Avatar
Originally Posted by eschlitzkus
I love the ball links you are using. What type are they?

They are 4-40 Sullivan S591 aluminum ball connectors with locking sleve from the local hobby store. Tower and others carry them...

Jan 18, 2011, 12:12 AM
Lbuff1's Avatar
Great job, The pan looks super. Obviously, you will love the plane, it flies so nice, as you know.
Maybe we an get out and fly it soon. NOT!

Jan 18, 2011, 01:10 AM
Registered User
would love to know the suggested throws for various conditions. Tom has offered but his is in his basement and would't want to make it difficult for him.
This may be gps contender but good grief I have to maiden it first. Has anyone winched launched theirs. Seems like a good candidate.
Regards Dean
Jan 18, 2011, 09:29 AM
Registered User
rcmorrow's Avatar
Steve, the plane looks great.....as do all of your builds. Looking forward to seeing it fly when the weather starts to break for us.

Your craftsmanship shines as always !

Jan 19, 2011, 12:04 PM
Registered User
Ranfred Radius's Avatar
The Nimbus should winch just fine! Just make sure you set it up for a bridal and make sure you angle the towhooks down slightly so the rings slip off as soon as you get off the pedal!

Also. I am ready to tow you with the Porter.. Just say the word!

Jan 20, 2011, 11:33 AM
life long racing nut & modeler
granada don's Avatar

Very cool Tuck & Roll its a shame to have to cover it up with your pilot, you have a hand lever on the control stick is that for a tow release on full size gliders ?

Feb 21, 2011, 06:12 PM
Team JR Air
SPasierb's Avatar
The Nimbus has been sitting in the workshop all dusty and forlorn. After a major shop cleanup this morning, it was finally time to actually program it into the 11x. Now that this is the fourth plane I’ve programmed on that radio, it’s a snap!

I also permanently attached the nose weight and put elastic cord on the retract doors. I had to run to WalMart for Velcro and decided to look in the sewing department and found some excellent 1/8” wide flat woven elastic. It worked out so well I replaced the nasty old stuff in my Duo Discus and replaced what was originally installed in my new 1:3 Ventus.

I’m still waiting for the missing wing servo covers to come from HKM and have yet to do the red diamond detail on the nose. Axel is enjoying his new home but his “posterior” needed a serious liposuction session to fit into the pan and with the seat detailing I did. I think his name will officially be Old Flat Butt. I used 1:4 multiplex instruments in the cockpit, but of course forgot to take a few photos.

It’s essentially ready to fly now, but it looks like many more weeks until the snow gives way to grass. I’ll post some photos and a flight report whenever that day comes.


PS: Don - I believe the lever is a wheel brake on the retract

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