BEAVER DH C2 no 2 30 IN RUBBER DUMAS KIT 306 Nov 25 2025 to PRESENT

[Lastwoodsman]

BEAVER DH C2   30 INCH RUBBER POWERED  FREE FLIGHT PARK FLYER   DUMAS KIT 306

Reply # 360      Tue June 30 2026       post 2 of  7

Flight Report # 27  of  Fri June 26 2026

Pic #1     3670     Short flight soft landing.

Pic #2     3671      Landing near a line showing two heights of grass.

Pic #3     3672     I let the flagging tape fall to the ground,  showing the wind direction.

Pic #4     3673     Moment of landing impact.

Flight 2    25 x 15  =  375  stretch winds.   Nice high flight into the wind  ie.  not much distance traveled.    Pic of the landing.   It is windy.

Lastwoodsman
Richard

[Lastwoodsman]

BEAVER DH C2   30 INCH RUBBER POWERED  FREE FLIGHT PARK FLYER   DUMAS KIT 306

Reply # 361      Tue June 30 2026       post 3 of  7

Flight Report # 27  of  Fri June 26 2026

Pic #1     3674     My set up,   blowing the orange flagging tape.

Pic #2     3675     Big long flight straight out.

Pic #3     3676     Big long flight curves left a little and lands.

Pic #4      3677     That is a long distance from the Pitch.

     A visit came by the Grass Mower Operator  after my second flight.    I was winding the Beaver on the Stooge,  and what do I see in the distance?   The dreaded,  foreboding,  grass mower was approaching      ,  'and the wind began to howl'    .   And he drove right up to me and stopped.   I asked if he could mow another spot first (they have long lists),  since I only had two flights so far.   He said he could but he had to get the Cricket field mowed today.   Then he asked me if the plane was RC (radio controlled).     I said rubber band power,  hoping it would sound like less of a worry.

     So,  it was because of his accommodating me,  that I was able to stay and get the next five flights in,   so I do have to thank him for that.    And now I see that he did get it mowed,  so hopefully all is well.         ie:  I am not getting into trouble yet,   for flying rubber powered balsa plane models in Jackson Park ... all is well ...

Flight 3     27 x 15  405  turns,   4 seconds long low left turn.   I cannot physically crank in any more turns without breaking the  15:1  winder -  I already broke the  10:1  winder dong the same thing.

Lastwoodsman
Richard

[Lastwoodsman]

BEAVER DH C2   30 INCH RUBBER POWERED  FREE FLIGHT PARK FLYER   DUMAS KIT 306

Reply # 362      Tue June 30 2026       post 4 of  7

Flight Report # 27  of  Fri June 26 2026

Pic #1     3679     Flight 4   long flight  11 sec

Pic #2     3680     Flight 5   long flight  13  sec 

Pic #3     3681     Landing of perfect  13  sec flight.

Pic #4     3682     Flight  6   8 sec  perfect

Flight  4  and  5  were both very long flights of  11 seconds and  13  seconds,  respectively,  on the  13"  motor.   These tied the  12"  motor best flights.

Flight 4   405 turns  11 seconds !!.     This flight was launched from the pitch and landed way out,  right beside the outer boundary white paint stripe on the Cricket Field grass.

     I launched on an upward angle,  straight into and at right angles,  to the tree line.   The wind was coming from the left,  and kept the plane flying straight  (it turns left naturally) off the start.   It eventually started to turn left into the wind (little wind).   Once the plane entered close to the lee wind side of the trees,  where the wind was blocked off,  it had enough rubber run out,  for a long lazy slow finish,  right out to the stripe.    All factors must came together to get this long of a flight -  especially the direction of launch,  and the angle of attack at launch., and the wind.   No super records or anything like that  -  just some fun small park flying.

Lastwoodsman
Richard

[Lastwoodsman]

BEAVER DH C2   30 INCH RUBBER POWERED  FREE FLIGHT PARK FLYER   DUMAS KIT 306

Reply # 363      Tue June 30 2026       post 5 of  7

Flight Report # 27  of  Fri June 26 2026

Pic #1     3683     Landing of  Flight 6.   Look at that thick grass !

Pic #2     3684     Underside view and closeup of the long grass.

Pic #3     3685     Here is my set up by the Pitch.

Pic #4     3687     Flight  7     It went right !!  Oh no!

Flight  5    405  turns  13 seconds !!   This ties the 12" motor record.   It was almost  2/3  of a circle,  and was the same flight as Flight 4,  but further out left.

      These last two flights 4 and 5,  really completely ran out the end of the rubber motor knots,  to the softest of landings in the unusually high grass.

Lastwoodsman
Richard

[Spiros]

I can hardly imagine this beauty, flying only for 13".

Why is this happening? Have you tried a straight single rubber? Obviously shorter but definitely could be stronger in my opinion.

[Lastwoodsman]

BEAVER DH C2  30 INCH RUBBER POWERED  FREE FLIGHT PARK FLYER  DUMAS KIT 306

Reply # 365      Tue June 30 2026      post 6 of  7

Flight Report # 27  of  Fri June 26 2026

Pic #1    3689    Wind gust blowing the flagging tape.  Time to go.

Pic #2    3690    Last pic of the high grass before mowing.

Pic #3    3691    Even deeper grass.

Pic #4      3692    The flower garden is fully planted.

Flight  6    405  winds  8 sec  perfect flight.  It went out one quarter circle left,  but not as far as the  13  and  11  second flights.  Good flight nonetheless.

Flight  7  405    6 sec    bad launch pointing too far to the right,  and the wind caught it and sent it way right to my shock!  The gusts were getting more prominent,  and it was getting windier, and it was too hot.  So I quit while I was ahead.

Lastwoodsman
Richard

[Lastwoodsman]

BEAVER DH C2  30 INCH RUBBER POWERED  FREE FLIGHT PARK FLYER  DUMAS KIT 306

Reply # 366      Tue June 30 2026      post 7 of  7

Flight Report # 27  of  Fri June 26 2026

Pic #1    3693    Wind on the flag on the way out.

Pic #2    3724    pics of Beaver at home

Pic #3    3726    The  9 inch tight motor is back inside the Beaver,  resting ....

Pic #4    3727    Ready to fly finger winds again .

    It might be later in the fall,  here as well,  for the next flights,  as we are in the big summer heat wave now ...

Conclusion:  The  13"  motor appears to be as good as the  12"  motor,  and the  15"  motor was too sluggish.  Of course we need more flights to be sure.    But for now,  that is the end  ....

End of Flight Report  #27 of  Fri June 26 2026

Lastwoodsman
Richard

[Lastwoodsman]

BEAVER DH C2  30 INCH RUBBER POWERED  FREE FLIGHT PARK FLYER  DUMAS KIT 306

Reply # 367     

Wed July 1 2026

Hi Spiros!  Thanks for the  'likes'.   

Quote from Spiros above  " I can hardly imagine this beauty, flying only for 13".

"Why is this happening? Have you tried a straight single rubber? Obviously shorter but definitely could be stronger in my opinion.  "

    That is a good  question,  the all time  question ... .    I was only going for a ten second flight from the beginning.  I think ZKAUD Mike said that he would be satisfied with a ten second flight (where is Mike?).  So,  I was going with that.
      I documented,  first time for me,  the different rubber motors and cross sections and their builds,  and their run times on my handy dandy table stooge,  and the run times outside also.    A power run time of 12 sec on the table stooge,  does not equate to a  12  sec flight outside ...

Pic #1    1739
Pic #2    2695
Pic #3    2726
Pic #4    2859   

"straight single rubber?"  -  do you mean a single strand  ( one half of a loop ),  and what total width cross-section of the rubber strand(s),  of your straight single rubber ?    I found that the best  'pull'  was that  eight strand  motor  of total cross section of  0.813" of rubber motor strands.    Since there is not a  0.813"  width in rubber  (only  3/32",  1/8",  and  3/16"),  I added extra strands sizes of rubber and tested them as I went along.

      I started this rubber powered hobby 14 years ago at age 55,  with the Guillow  Nieuprt 11  24" laser cut kit (totally hooked) just for a display model back then,  so I don't have all the answers.    I think it was Cal Goddard who said it would be good to get a ten second flight with this 30" Beaver plane too.  And I always thought that that blunt nose,  and the enlarged landing gear and no windshield,  were all resistance factors causing shorter flights.

PLUS

Total Wing Area  3.3125" x 30"  =  99.375" sq

Max Weight Rule for Flying is  0.5 g of model weight per one sq inch of lifting surface.

99.375 in sq  X  0.5g per in sq =  49.7 g

The Beaver weighs about 113 g,  so it is way over weight.   

    I am settling in for  'build mode' with the 30" Gipsy Moth now,  in my air-conditioned apartment,  during this heatwave.    No flying for me ...

Lastwoodsman
Richard

[Spiros]

What I would do, is double strand double lenght than the motor to peg. I'm not sure on the size but in metrics I would go somewhere betweem 4,20 - 4,40mm.