The Comet Stinson SR-7 - Another Free Flight conversion project - Video Addeded - Page 9 - RC Groups
Thread Tools
Oct 13, 2010, 09:59 AM
Registered User
D-Rock's Avatar
Fantastic Mr. Bradley, very well done!

Sign up now
to remove ads between posts
Oct 13, 2010, 02:16 PM
Registered User
P_J_Glor's Avatar
Fantastic little bird. I found this thread through the link you posted on the Scale Electric Models thread for E-Challenged's Tritle SR-10 build.

In the video, she seems to be a much more realistic flyer than many others I've seen at much larger sizes. Years ago I built one in orange and white tissue for rubber power with a cowling much like yours which flew very well. She is long gone, but I still have another kit and xeroxed plans and printwood stashed away. Also plans for the Megow Reliant and several straight winged versions, and a Sterling SR-8.

I am thinking the Comet design might be a good candidate for the Parkzone "Playmate" innards. Great inspiration!

Pete G.
Dec 07, 2010, 10:12 PM
AMA #903699
Tony_Fletcher's Avatar
Originally Posted by PaulBrad
Glenn - That method is very good when you have access to the servos. My installation will not have servo access once the tray is in place. Hence the magnet joiners.
So...does the pushrods "travel stop" allow you to tug enough on the rods to break the magnets free without hosing up the control surfaces?

Fantastic project—very inspiring. I'm starting a conversion of the Dumas Staggerwing.
Last edited by Tony_Fletcher; Dec 07, 2010 at 10:22 PM.
Dec 09, 2010, 12:06 AM
Registered User
PaulBrad's Avatar
Tony - The pushrod travel stops work very nicely in preventing damage to the elevator and rudder when I remove the equipment tray. The force of the pushrod magnets is plenty to keep things together when flying but does not place that much stress on the stops when the tray is removed. The set up has worked much better than I could have hoped for.

PJ and D-Rock - I apologize for not acknowledging your comments long before now. I have been buried in projects and have not kept up with this thread. Your collective kind words are greatly appreciated.

Paul Bradley
Dec 09, 2010, 01:41 AM
AMA #903699
Tony_Fletcher's Avatar
Great design-very clever!
Sep 18, 2011, 06:46 PM
Just a guy.
Indoor season is going to be starting for us fairly soon so I was going over some of my indoor gear and planning out some builds. I had to come back and go over this thread. I also felt that I needed to add to it. Last season I copied the sliding motor tray - so far it has flown in two models. One was little more than a test bed. The other is a micro Lazy Bee. I love the tray and am always on the lookout for other models it will fit into.

Here is a video of my Lazy Bee.

Micro Clancy Lazy Bee (4 min 45 sec)
Oct 28, 2012, 05:19 PM
Registered User
brianjt's Avatar

Thanks for the plans


Just wanted to drop a note and thank you for making the plans available for download. I know this is an old thread but I really enjoyed building your Stenson and just wanted to say thanks..

I Went with an out runner, separate ESC, 2 cell and servos so I beefed it up a bit to deal with the increased power. My all up weight is 5 7/8 oz so the wing loading came out to 10oz/sq ft, which is not too bad for this size.

Should be doing the maiden within a couple of weeks, if anyone is interested ill post the results.

Thanks again
Oct 28, 2012, 05:40 PM
Registered User
PaulBrad's Avatar
Nice model. I would certainly be interested in a flight report. I expect that with your added power it will fly very nicely. At the higher weight/power loading it will also tolerate more wind.

Paul Bradley
Jan 07, 2014, 10:29 AM
Registered User

Alternate Electronics Source

Another potential source for electronics used in micro models is used up or crashed 4 channel micro size heli's. The best use linear servos and come with their own 2.4 gig hand units. New prices run $25 to $35 RTF, much less than Spectrums very usable little unit. Most have a tail motor which I have not figured out how to use yet so it goes in the donor bin for another project. Have used the fairly high powered drive motor at times without a gear down. Careful choice of prop is needed and finding adaptors with the proper shaft size is a problem. Have lifted a 5 oz foamy with no over heating problems using a 6 inch high speed prop. Happy building!
May 02, 2015, 04:30 PM
Registered User
Hi Paul. I have been wanting to build this model for some time. I greatly appreciate the time you have put into this conversion thread and the detailed explanations of what you have done. My model is all framed up and I'm now at the stage of putting the motor and electronics in before covering. I am curious if you used any down or right thrust on your motor and also if you changed the wing incidence from standard.
Thanks Graeme
May 03, 2015, 10:30 PM
Registered User
PaulBrad's Avatar
Graeme - I did not use any right or down thrust on my SR-7. The wing incidence is per the original plan. That seems to work quite nicely. Since you have elevator control as opposed to the Free Flight version, you can use your elevator trim should you find the incidence as drawn on the plan not adequate for your needs.

Paul Bradley
May 04, 2015, 12:05 AM
Registered User
P_J_Glor's Avatar
That is good to hear, as any offset would be more noticeable with that big cowl. Either the cowl would be 'cocked,' or the prop shaft off center.

Pete G
May 04, 2015, 12:49 AM
Registered User
Thanks for that info Paul. Now to get into finishing this little gem. Will post pics of the model when done.


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Comet 25" Stinson Reliant SR-7 PaulBrad Free Flight 36 Jun 14, 2010 11:02 AM
Build Log Stinson Reliant 18" Span 1/28 Scale Rubber Conversion ( ready for another trial) GJ60 Scale Kit/Scratch Built 127 Oct 30, 2009 06:42 PM
Yippee! Stinson Reliant SR-7 from Comet plans igo Foamies (Scratchbuilt) 10 Sep 20, 2007 10:02 PM
My Stinson Reliant SR-7 building Rembold Scale Kit/Scratch Built 24 Jan 08, 2006 01:48 PM
Another Estes Free Flight Conversion Question Cautrell05 Foamies (Kits) 4 Oct 20, 2004 03:17 AM