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Building Tips and technical articles. => Building techniques => Topic started by: Avaiojet on November 02, 2013, 07:31:22 AM

Title: Firewall engine mount, R/C style. Success!
Post by: Avaiojet on November 02, 2013, 07:31:22 AM: Has anyone had success with a firewall engine mount, R/C style, in a stunt application?

Got a bit of info from a search, but not really a great deal. I do know the TF Score has this configuration.

I'm considering this type of construction for a GBR-3.

Thanks in advance.

Charles
Title: Re: Firewall engine mount, R/C style. Success!
Post by: Will Hinton on November 02, 2013, 07:55:43 AM: I've used the R/C mounts in several stunters with no problems. In fact, my new Pawnee has such a mount. I use basswood triangular stock in the corners of the tank box as well as ply gussets everywhere and have close to a thousand flights on my #1 Crosswind with a PA65 with no problems whatsoever.
It's the third ship with many flights on it that uses the mount. I find I save close to one ounce total in that type of construction. That's not why I first used the system, but it was a bonus.
Title: Re: Firewall engine mount, R/C style. Success!
Post by: Serge_Krauss on November 02, 2013, 12:25:02 PM: You might check Igor Burger's site for a firewall mount he uses too.
Title: Re: Firewall engine mount, R/C style. Success!
Post by: RC Storick on November 02, 2013, 12:30:19 PM: this is the only one I have ever done and it worked good.

(http://stunthanger.com/smf/index.php?action=dlattach;topic=12276.0;attach=41178;image)
Title: Re: Firewall engine mount, R/C style. Success!
Post by: Avaiojet on November 05, 2013, 02:16:37 PM: Well, I guess I'll try that firewall mount.

Thanks for the replies!

Charles
Title: Re: Firewall engine mount, R/C style. Success!
Post by: Chris Wilson on November 05, 2013, 06:19:37 PM: Quote from: Ty Marcucci on November 04, 2013, 04:29:50 PM
I've done two with great success. One on the Imitation profile and one on the 1958 Sleekster. H^^
You have used a radial mount on a profile model? ???
Title: Re: Firewall engine mount, R/C style. Success!
Post by: Curare on November 05, 2013, 07:22:22 PM: Yes, it's been done, look up Ted Fancher's Imitation.
Title: Re: Firewall engine mount, R/C style. Success!
Post by: Avaiojet on November 06, 2013, 06:13:17 AM: Quote from: Ty Marcucci on November 05, 2013, 08:23:03 PM
Hi Chris. You have to see the Ted Fancher "Imitation" to understand. It is designed for a radial mount. If you can get your hands on a UHP kit or a set of plans, build it. It will be the best profile you ever build and fly. H^^ y1

Well, It sure is a fine looking model. And not at all what I expected.

There's plenty to read on line about Ted Fancher and his "Imitation" design. Including many Threads in SH.

Worth the investment in time? Absolutely!

Here's a start!

http://www.scribd.com/doc/24098001/Imitation-Article

Charles
Title: Re: Firewall engine mount, R/C style. Success!
Post by: Trostle on November 06, 2013, 06:39:22 AM: Quote from: Ty Marcucci on November 05, 2013, 08:23:03 PM
You have to see the Ted Fancher "Imitation" to understand. It is designed for a radial mount.

One of the neat things about Ted's profile Imitation with the radial mount is that the engine could be oriented in any direction. His article discusses his findings on this.

Keith
Title: Re: Firewall engine mount, R/C style. Success!
Post by: Avaiojet on April 12, 2017, 05:59:49 PM: Better late than never.

I Just wanted to thank everyone who gave me positive advice on using the R/C radial type glass filled mount.

As you can see, I took your advice.

Thank you.

CB
Title: Re: Firewall engine mount, R/C style. Success!
Post by: john e. holliday on April 13, 2017, 10:24:48 AM: Amazing.
Title: Re: Firewall engine mount, R/C style. Success!
Post by: Avaiojet on April 14, 2017, 06:15:55 AM: Forgot to mention the above photos are three different models I currently have in the works using R/C glass filled engine mounts.

The Fire Boss, a crop duster biplane and the Gee Bee R-3.

I also have one more design in the works, this would be the Biplane Pusher. No hurry with that design.

I do like the idea of using these kind of mounts for these particular designs because as it was mentioned, engine choices can easily be changed.

Engines can be changed without altering the model also.

As you can see I have my hands full with a good deal of work ahead of me.

Here's photos of the aircraft I'm modeling using the glass filled mounts. The GBR3 isn't an actual aircraft.

CB
Title: Re: Firewall engine mount, R/C style. Success!
Post by: FLOYD CARTER on April 14, 2017, 11:47:54 AM: Back in the '50s, my friends and I built many stunters mounting the K&B Torpedo 29 (3-bolt crankcase) directly to a 1/4" firewall. Many modern engines will still allow that mounting. The 4-bolt OS engines need just replacing the backplate screws with a threaded stud.
Title: Re: Firewall engine mount, R/C style. Success!
Post by: Avaiojet on April 14, 2017, 06:04:35 PM: Quote from: FLOYD CARTER on April 14, 2017, 11:47:54 AM
Back in the '50s, my friends and I built many stunters mounting the K&B Torpedo 29 (3-bolt crankcase) directly to a 1/4" firewall. Many modern engines will still allow that mounting. The 4-bolt OS engines need just replacing the backplate screws with a threaded stud.

FLOYD,

I had one of these crazy rear mounts early on in R/C. I never used it.
Title: Re: Firewall engine mount, R/C style. Success!
Post by: Mark Scarborough on April 14, 2017, 07:18:50 PM: Quote from: FLOYD CARTER on April 14, 2017, 11:47:54 AM
Back in the '50s, my friends and I built many stunters mounting the K&B Torpedo 29 (3-bolt crankcase) directly to a 1/4" firewall. Many modern engines will still allow that mounting. The 4-bolt OS engines need just replacing the backplate screws with a threaded stud.
essentally the same method used n Pylon racing , there is a 1/4 inch plate that bolts onto the back of the motor using the backplate screws, then that screws to a 1/2" firewall that is carbon fibered into the fuse, radial mounts can vibrate, and vibration is horsepower going to waste, so the more rigid the mounting system the more horsepower gets to the prop,,,
Title: Re: Firewall engine mount, R/C style. Success!
Post by: Paul Smith on April 15, 2017, 10:23:11 AM: It's a good idea with a box fuselage.

It seems like a needless uphill battle on a profile. The profile is intended to have beam mounts.