MPF M6 Mermaid Scratch and Kit Built - RC Groups
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Apr 02, 2013, 07:20 PM
Ken's CAD Models
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Build Log

MPF M6 Mermaid Scratch and Kit Built


Build Guide for Dz1sfb modified Mermaid Seaplane and Kit details


The object of this blog entry is to capture changes that I made to the Vlesie (Marcel) Mermaid design so that if you want to, you can make one like it. Marcel’s design performs wonderfully like it is, but changes in materials drove me make some design changes and enhancing flight characteristics was also desirable. Also the provided build documentation will support those who desire to assemble parts supplied by Ken’s CAD Models.

Link to Marcel's original design thread.

Changes to Marcel's design include:
Revised aileron servo location and mounting
Redesigned horizontal stabilizer/elevator assembly
Redesigned tail former
Added fuselage deck/battery support
Redesigned wing with KFm2 airfoil and affected wing braces
Changed wing tip floats from a laminated design to a hollow 3 piece interlocking design.
Reinforced motor mount box mounting to fuselage.

Mermaid M6 Specifications
  • 41” Wingspan
  • 35.64” Length
  • 11.17” Height
  • 16-21oz ready to fly
Tools and Supplies for assembly
  • Hobby knife with a fresh sharp blade
  • Painters or masking tape
  • Foam Tac Adhesive
  • Gorilla Glue White Formula
Finishing Supplies and Parts
4 – 9g Servos
1 – 25-35 Amp ESC
1 – 2405 2190 Kv or a 2212-06 2200 Kv brushless outrunner motor
2 – 16” servo extension leads
1 – 6” x 4” APC Propeller and adapter for motor
Clear and colored packing tape for protecting and decorating the airframe
.032” and .039” music wire for pushrod
4 – Du-Bro no. 849 EZ Connectors for pushrods
1300-2200 mAh 3s lipo battery
6 channel receiver and transmitter
Let’s Get Started
Remove parts from the carrier sheets only as they are needed. This prevents loss, damage, and confusion regarding which part is which (some parts are similar in size and shape). Also be sure to sand off any residual material from tabbing parts to sheet. These will otherwise interfere with a good glue joint.

1. Sub-Assemblies
a. Laminate Wing Braces
i. Front Wing Braces – Upper and Lower
ii. Rear Wing Braces – Upper and Lower
iii. Mid Wing Braces – Upper and Lower
b. Assemble Engine Nacelle
c. Assemble Vertical Stabilizer/Rudder
d. Assemble Horizontal Stabilizer/Elevator
e. Assemble Fuselage Sides
i. Install carbon fiber rod reinforcements
ii. Install foam doublers, upper, mid, and lower
f. Assemble Wing Panels
g. Assemble Wing Tip Floats
2. Fuselage Deck Panel Assembly
a. Install upper bulkhead panel
b. Install vertical stabilizer sub assembly
c. Install upper wing dihedral formers
d. Install lower horizontal former

3. Fuselage Side Assembly
a. Install carbon fiber rod reinforcements
b. Install foam doublers, upper, mid, and lower
4. Fuselage Assembly
a. Join Mid Deck Panel Assembly and Fuselage Side Assemblies
b. Route servo extension wires
c. Pull motor pylon area together and add Engine Nacelle Sub-assembly
d. Pull nose together over battery tray area and install nose former
e.
Kits are available here.

Work in Progress,
Ken
Last edited by dz1sfb; Dec 02, 2017 at 09:20 PM. Reason: adding photos
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Apr 08, 2013, 08:50 AM
was geht , müssen unten kommen
Keenan smith's Avatar
I Wan't One!!!
Apr 08, 2013, 10:23 AM
Ken's CAD Models
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Quote:
Originally Posted by Keenan smith
I Wan't One!!!
Kits are available for order on my website [URL="https://www.kenscadmodels.com/product-page/mermaid[/URL] or you can scratch one out from the plans in the original thread.

I have to check on shipping to the UK.

Best wishes,
Ken

Edit: Shipping to UK via USPS Priority International will be $45
Last edited by dz1sfb; Dec 02, 2017 at 09:21 PM.
Apr 12, 2013, 08:13 PM
Ken's CAD Models
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Post #1 updated with new pictures. This continues to be an ongoing project as I get through customers planes.

Ken
Latest blog entry: Ken's CAD Models new web site
Apr 15, 2013, 10:22 PM
Registered User
Very Nice Job! will be ordering one soon
BTW, what material is used on the Stingray wing?
Thanks
Apr 16, 2013, 09:53 AM
Ken's CAD Models
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Quote:
Originally Posted by lv2soar
Very Nice Job! will be ordering one soon
BTW, what material is used on the Stingray wing?
Thanks
The Micro StingRay uses 3mm Depron, while the Mini and 3.0 utilize 6mm MPF.

Ken
Latest blog entry: Ken's CAD Models new web site
Apr 16, 2013, 09:58 AM
Tony Audsley Retired Locksmith
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Hi Ken, do you find it necessary to have the motor pointing down ? I have a Bixler pusher with a motor pod up top and it is pointing the other way

Have you ever tried it with zero thrust either way?

Lockey
Apr 16, 2013, 10:10 AM
Ken's CAD Models
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Quote:
Originally Posted by Lockey
Hi Ken, do you find it necessary to have the motor pointing down ? I have a Bixler pusher with a motor pod up top and it is pointing the other way

Have you ever tried it with zero thrust either way?

Lockey
This model has flown very well with the design thrust angle. Most forward high mounted engine seaplanes need a bit of upthrust to compensate for all the drag beneath the thrust line. The further aft the motor moves the closer to zero degrees it can be, then if you continue moving the motor aft some down thrust is needed, as in the case of the BD-5 or Drongo. Even the Polaris has a bit of downthrust in it.

In the case of your Dualis, it probably would be wise to do some testing, even starting at zero degrees would be okay. You just have to watch out for a nose down pitching moment if you throttle up suddenly. Then make adjustments to the angle until it responds in a manner that works well. I am guessing you will need between 2 and 4 degrees.

Ken
Latest blog entry: Ken's CAD Models new web site
Apr 16, 2013, 08:34 PM
Tony Audsley Retired Locksmith
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Thanks for you reply Ken, I assume when you are talking "upthrust" this is what you mean (see pic)

Lockey
Apr 16, 2013, 09:16 PM
Ken's CAD Models
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Lockey,
Yes, that is what I mean.

Ken
Latest blog entry: Ken's CAD Models new web site
Apr 17, 2013, 02:26 AM
Vladimir
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I admire your photo instruction! Thank you!
Apr 19, 2013, 05:46 PM
Ken's CAD Models
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Here is the first Ken's CAD Models kit built Mermaid.

Ken

Latest blog entry: Ken's CAD Models new web site
Apr 23, 2013, 11:01 AM
Registered User
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Hi Ken, just received the kit. Looks great so far, is this the "Foam tac" that you used??? and you also list white gorilla glue, very familiar with the White GG but not the foam tac?

Is this it?? and do they carry it local like at michael's??

http://compare.ebay.com/like/3507637...Types&var=sbar

Which joints is which one better at ??

Thanks

Pat
Apr 23, 2013, 02:51 PM
Ken's CAD Models
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Quote:
Originally Posted by wheelspinner20
Hi Ken, just received the kit. Looks great so far, is this the "Foam tac" that you used??? and you also list white gorilla glue, very familiar with the White GG but not the foam tac?

Is this it?? and do they carry it local like at michael's??

http://compare.ebay.com/like/3507637...Types&var=sbar

Which joints is which one better at ??

Thanks

Pat
Hi Pat,

That is the correct product. No, they don't carry it at Michael's.

I have used the Foam-Tac on all joints except the KF wing panel lamination and the wing to fuselage joint. Gorrila glue on those.

Ken
Latest blog entry: Ken's CAD Models new web site
Apr 23, 2013, 03:01 PM
Registered User
Hi Ken
If I were to cut the kit myself. How many sheets of depron will I need
and what dimension size are the sheets?
Thx
Last edited by lv2soar; Apr 23, 2013 at 08:50 PM.

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