Dynamo 125 EP (oz12666)
About this Plan
Dynamo 125 EP. Radio control sport model, for electric power.
The Wally Simmer's Dyna-Moe (oz6463) was first published by Midwest in 1947. This here is a later version, enlarged by 25% for RC and electric power.
Quote: "Back in June I posted a gallery in RC Groups on an original sized Wally Simmers/ Midwest RC Dynamoe powered by a Eflite Park 180 utilizing a salvaged A3SX receiver from a foamy. That model was a great success and prompted me to think a little bigger. I have used Park 250 motors with 2 cells on a number of small gliders and sport planes. I decided to enlarge the Dynamoe by 25% and use this motor.
I used a scan from Outerzone and created a 125% drawing using AutoCad. I built the first of two 125% Dynamoes in mid-July. I did add one additional bay to each wing half for a wingspan of 46-1/2 inches. The model weighed in at 10.2 ounces with 253 sq. inches of area. I covered it with transparent white Ultracote with red leading-edge panels. This proved to be a mistake.
The model was joy to fly. I climbed well on the Park 250 and I was getting flight times of 12 to 15 minutes. On a July 26 I flew a couple of larger gliders in a very active thermal setting. I had a couple of flights where I spent most of the time trying to keep the model closer to ground.
When the wind died down and I launched the Dynamoe. It climbed quickly and after several minutes of lift I lost sight of it in the sun. The transparent white covering blended in with the cumulous clouds and I never saw it again. It is in a tree or a corn field. I wanted to build another right away so I tried to order another Park 250. The local Hobby shop was out of stock, so I tried to buy direct from Horizon. They were also out of stock.
I then went to the Innov8tive RC site and found the specs for the Cobra2204/32 motor. I ordered one and started the second Dynamoe 125 as I have dubbed it. I decided to eliminate the side stringers on the second model since they added complexity to covering. It I went together fast and this time I used transparent red on the wing and stab and rudder. Red a very visible to me in any conditions.
The Cobra 2204/32 weighs .79 ounces and has a die cast frame with four mounting brackets. I screwed it to the fireball and connected it to a Cobra 11-amp esc.
The model weighs 10.0 ounces RTF with a 2 cell 450 mah pack and has a wing loading of 6.3 ounces per sq ft. I initially used a GWS 7/6 prop which resulted on 73 watts of power. The model was way overpowered and climbed straight up. I finally settled on a GWS 7035 x 3.5 prop which yield 44 watts at 5.7 amps for a nice controlled 60-degree climb.
The flight times are 20 to 25 minutes with the 450 pack. I typically climb to a few hundred feet and glide back. It is also a lot of fun to cruise in lazy circles at 1/4 throttle. In the free flight mode, the Dynamoe climbs in a gradual left turn and recovers easily when power is shut off."
Did we get something wrong with these details about this plan (especially the datafile)?
That happens sometimes. You can help us fix it.
Add a correction
Dynamo 125 EP
by Jim Zare
Electric R/C Cabin
all formers complete :)
Found online 22/11/2020 at:
Format: • PDFbitmap
Do you have a photo you'd like to submit for this page? Then email firstname.lastname@example.org
User commentsNo comments yet for this plan. Got something to say about this one?
Add a comment
* Credit field
The Credit field in the Outerzone database is designed to recognise and credit the hard work done in scanning and digitally cleaning these vintage and old timer model aircraft plans to get them into a usable format. Currently, it is also used to credit people simply for uploading the plan to a forum on the internet. Which is not quite the same thing. This will change soon. Probably.
This model plan (like all plans on Outerzone) is supposedly scaled correctly and supposedly will print out nicely at the right size. But that doesn't always happen. If you are about to start building a model plane using this free plan, you are strongly advised to check the scaling very, very carefully before cutting any balsa wood.
© Outerzone, 2011-2021.
All content is free to download for personal use.
For non-personal use and/or publication: plans, photos, excerpts, links etc may be used, provided that full and clear credit is given to Outerzone with appropriate and specific direction to the original content i.e. a direct hyperlink back to the Outerzone source page.
Unauthorized use and/or duplication of this material without express and written permission from this site's owner is strictly prohibited. If we discover that content is being stolen, we will consider filing a formal DMCA notice.