Dymond 72" Tiger Moth Bipe Electric Conversion

[santeepat]

Dymond Modelsports closed it's shop awhile back and Helmet sold my partner and I the huge 72" beast hanging in the shop for some small pocket change before he closed his doors. :)

The kit comes as an ARF and is meant to take a .91 gasser...There is not a lot of info on the web for the 72" and I have read the review from RCU for the smaller 50". Helmet said this flies very well and has nice glide characteristics. It should w/ a wing area of 1400 sq. in. : :D

We will be converting this using a Turnigy 50-65B 350kv motor, 80 amp ESC, 17x10 APC on 6S batts to start/test.

My Partner, Hoby, has given it the once over and epoxied and assembled the tail section and is now giving his attention to the motor mount set-up to accept the E conversion...

[santeepat]

Motor mount and detailing of this Tiger Moth complete :) .

[santeepat]

Solid front to handle torque

[shv2sail]

She looks great! Do you have an estimated all up weight? I recently converted a 1/5th (true 85" span) scale Piper L-4 using the 320Kv version of this motor. On 6S and an APC 16x8e it only drew about 550W full throttle (using Maxamps 4000HV lipos). Now, for 'scale' cub-like flight this is fine with an all up weight of 9lbs. In the spring I converted my dad's Balsa USA Phaeton 90 - which is also a 72" span biplane...with an all up weight of about 12lbs. We again used a Turnegy, but used the 270Kv version on 8S and a 18x8 prop (flys fantastic). Next on the build table is Nitro's 76" span version of the Tiger Moth...planning on using a 1500W power system on 8S.

My only point is to make sure you a: weigh the aircraft in it's flying condition, b: run the system on a watt meter and c: are comfortable flying with a very possible low watts per pound ratio.

ps-I didn't know Dymond had folded...and here I was trying to contact them the last day or two...no wonder I haven't had any luck!

[tai626]

Nice biplane!!! I have an old version of same motor. You should get 50A, 970 W and 6000 rpm with this setup.

[shv2sail]

I bet (based on your airframe weight photo), your system will fly her just fine if the numbers match tai626's.

[santeepat]

She looks great!

ps-I didn't know Dymond had folded...and here I was trying to contact them the last day or two...no wonder I haven't had any luck!

Dymond's storefront has closed...but their web site is still operating as a web only business :)

I will get a video of the flight this weekend and I hope the numbers pan out as 1000W is what we are shooting for.

[warhead_71]

Your landing gear are on backwards. The X-brace goes under the wing, and the trailing braces run back from under the cowl.... although it will probably track a little better and prevent nose-over on landing with the wheels farther forward. :)

http://www.hobby-lobby.com/images/rcm760c.jpg

[santeepat]

War,

you are correct...and just as you surmised, Helmet informed us that mounting the landing that way improved nose over potential and tracking is improved. :)

The maiden went well as this Tiger Moth just floats and floats.

Still finding the right motor/prop set-up as this was WAY over powered w/ a 17x10.

Vid soon.

[tai626]

good show! Waiting video.

[santeepat]

AUW is 12 lbs

http://www.youtube.com/watch?v=LJ_eMHIYRAU

[tai626]

Good flyer! Nice video!