1.5m Chrysalis Electric- Pod and Boom - RC Groups
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1.5m Chrysalis Electric- Pod and Boom

This is the latest of the "Chrysalis" line of sailplanes and electric powered sailplane kits. It was developed along with the 1.5m Chrysalis E with the wood fuselage.

1.5m Chrysalis Electric- Pod and Boom

A Pod and Boom Chrysalis

From Joe Hahn:

We were looking for a version of the 1.5m Chrysalis E with simpler (faster!) construction and lighter weight, basically optimizing the design for a broader speed range and maximum response to changing air currents.

The "pod and boom" became the obvious major change that would A: cut down the building time, and B: cut down the overall weight of the airframe. It has proven to provide both those features, while maintaining (actually improving on!) the great performance and personality of the previous versions!

1 5M Chrysalis Electric Pod & Boom Sailplane Introduction (2 min 53 sec)

One of the major weight saving contributors is the use of the "Lite" types of covering materials. Incorporation of diagonal braces in the wing allows the use of these materials without giving up too much torsional strength in the wing.....resulting in a weight savings in the 2.5 ounce range over conventional standard weight covering (Monokote, Ultracote, etc). The tail structure has been improved from the original Chrysalis, which allows use of the "Lite" types of covering on it also. Again, reducing the weight in that area. Even if the builder prefers standard weight covering materials, the finished weight of the pod and boom version will be in the 13 ounce area, which still produces a plane with a very wide speed range coupled with tight turning ability. But to extract the most potential, the "Lite" coverings can't be beat! Testing we performed after the video was shot confirms all of the above!

Our recommended equipment is same as the Wood fuselage version. However, as a result of lighter structure, we've found that a 2 cell pack, of 450 mah and at least 35C rating, produces a climb rate that is very fast, roughly a 70 degree angle of climb, while keeping the weight down to minimum for maximizing the response to thermal activity.

Using the same wing and tail as the previous version, the builder can now achieve ready to fly weight in the neighborhood of 10.5 ounces, without any mods to the 1.5m Chrysalis Electric- Pod and Boom!

Our equipment recommendation:

  • 2 each, 4 to 6 gram servos
  • mini receiver
  • 2 cell 450 to 850 Li-poly, OR 3 cell 450 to 850 Li-poly battery
  • 2208-12 Cheeta or Suppo motor (available separately)
  • 18 amp minimum ESC with bec.
  • 7.5 "x 4" folding propeller with 34mm spinner and 3.2mm shaft adapter (available separately)
We recommend "Lite" covering for minimum weight/maximum performance.

1 5M Chrysalis Electric Pod & Boom Sailplane (3 min 29 sec)

Specs:

  • Wingspan: 59 inches
  • Wing Area: 410 square inches
  • Fuselage Length: 37.5" (with our motor & spinner recommendations)
  • Weight: 10.5-13oz (Depending on radio,battery & covering options)
  • Wing Loading: 3.6 to 4.5 oz/sq.ft.

Features:

  • Re-engineered wing structure-Simpler/Stronger construction incorporating carbon fiber spar system, diagonal braces & pre-cut wing sheeting complete with "bolt on" wing attach system w/hardware
  • New Pod and Boom style fuselage with magnetic hatch (supplied)
  • Tail-Incorporates laser cut lightening holes & reinforced stabilizer leading & trailing edges
  • The kit includes laser cut parts, a fully photo illustrated assembly manual with full size plans, and all hardware required. A 2 piece wing kit is also available separately.
Base price is $95.

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Mar 23, 2017, 11:22 AM
Registered User
Steve Merrill's Avatar
Looks great! I noticed your prop is not folding. Couldn't tell if you had a folding prop installed, but if you do, then loosen up the bolts on the yoke, so that those blades fold easy. Will need to set your brake function on your ESC to hard brake.

I had an original HLG Chrysalis back in about 1998 or so. It flew great. I loved slope soaring it on very small ridges.
Mar 23, 2017, 11:35 AM
Registered User
Don Stackhouse's Avatar
No, that is a folding prop, it just wasn't folded when the picture was taken.

And, yes, folding props need to be assembled and set up properly to get them to fold when they are supposed to. However, leaving the screws too loose is also bad. Also, the blade retaining screws need to be Loctited on any folding prop, but be very careful not to get Loctite where it could interfere with the hinge action of the blades.

We have a short article on our website on how to assemble a folding prop correctly. Oddly enough, the prop makers do not seem to cover this subject very well, and there are a surprising number of model builders who don't know how to properly do it. Builder education is one of a kit maker's more mundane, but crucially important responsibilities.
Last edited by Don Stackhouse; Mar 23, 2017 at 11:41 AM.
Mar 25, 2017, 04:56 PM
DJ Aerotech
f4you's Avatar

Power system option


Just got back in from another "test flight". This time I wanted to see how the pod and boom ship responded to an alternative propeller.
The goal was to use the largest size propeller the system can comfortably handle, in the 2 cell battery configuration(2 cell 450 mah in this test).
Ground run showed that a 9 x 5 folding propeller was about as much as the system can handle with the 2 cell 450 pack. It gave me 13 amps on the ground, which is close to the maximum rating of the battery.
Flight performance was very nice, with about a 70 degree climb angle, and no noticeable change in flying characteristics. It was also a bit quieter, as the rpm was quite a bit less than it normally is with the 7.5 x 4 prop. The climb rate was almost identical to the rate with the 7.5 x 4. I got a total of 6 roughly 15 second climbs to altitude.
Overall, I'd say this is an acceptable alternative in combination with the 2 cell battery, especially if you're in a noise sensitive area.
Apr 04, 2017, 07:38 AM
Registered User
Will DJ Aerotech be offering the larger prop for sale on their website?
Apr 04, 2017, 09:26 AM
DJ Aerotech
f4you's Avatar
Quote:
Originally Posted by aerotony
Will DJ Aerotech be offering the larger prop for sale on their website?
We'll have them available soon!
Apr 04, 2017, 05:11 PM
Registered User
Brynmr's Avatar
I understand about weight saving but that boom doesn't fit with the rest of the plane, aesthetically.
Apr 04, 2017, 07:32 PM
DJ Aerotech
f4you's Avatar
Quote:
Originally Posted by Brynmr
I understand about weight saving but that boom doesn't fit with the rest of the plane, aesthetically.
There is a great option available.....here's a link to something you may like!
http://www.djaerotech.com/1-5m-chrysalis-electric/
Apr 04, 2017, 07:35 PM
Registered User
Brynmr's Avatar
Quote:
Originally Posted by f4you
There is a great option available.....here's a link to something you may like!
http://www.djaerotech.com/1-5m-chrysalis-electric/
Excellent!
May 29, 2017, 09:23 AM
DJ Aerotech
f4you's Avatar
Great build thread here:

https://www.rcgroups.com/forums/show...s-Pod-and-Boom

Joe
DJA


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