1949 Lawrence Institute of Technology G-1

That's it! One thing's for certain... no broken props when landing and tumbling! Here's the 3-view.



Basic airframe getting balanced.



Hard point for micarta bell crank.



Weights hammered 1/4" flat to fit then doublers glued to fuse.



Lead out guide fabricated. Those little RC servo eyelets used.



Ready for paint then the lead outs and push rod can be fitted. It weighs 92 grams as it is. Maybe it should be called 'Porky'!

Very interesting model! Nicely crafted. I'm wondering if it might be difficult to start with the tail-boom frame around it. Had you considered using a cam-style spring-starter? Cox International stocks both R/H and L/H versions, but you may need to swap to a hex drive-plate.

http://coxengines.ca/front-end/

Thanks for the compliment! The fine members here referred me to Cox in order to get some left handed (or is it right handed) spring starters. I also bought some reverse pitch three blade props. Two bladers won't fit between the booms. There is a hole drilled in the fuselage for one of the lead outs to pass. The rear one goes just under the engine. I'm going to put some nitrate on it this week and hopefully be able to spray the white this weekend. It has black trim. Me... like... simple...

I see you put a link, there, too! Thanks again!

Good looking little airplane ARUP

I light of the fact that "Cessna 337 Skymaster" has been mentioned by Marleysky in this subject, I guess I'll let you all in on a little secret. I have been hoping for some time to start a project to build a Skymaster for the reed speed comp. Like most of my "projects" this one will probably be pretty slow to get off the ground (excuse the pun). I just thought I'd mention it in case someone beats me to the punch. The G-1 looks similar to what I had invisaged, except that a pair of Pee Wees would be used. It's only a concept at this stage, but I'd sure like to give it a shot some day.

Rod.

Thanks for checking my G-1 akjgardner and Rod! One thing helpful with the Cessna 'Mixmaster' is that the front engine will be functional as opposed to the G-1's dead lead! BTW... the colors are white with red and blue trim. I had one of my moments.  I have some ideas for other racers that should prove competitive, at least, from an air frame point of view. I'm not much with 'hopping up' of motors.

G-1 model LOA is >12" but I was just looking at the rules and this model won't meet specs due to length of thrust washer to tail! Bummer!

Well that will need to be clarified. The measurement from the thrust washer probably only really refers to a front mounted engine, surely not from engine to tail with your configuration.

Maybe it should say "total length of the model excluding propeller and spinner" or something like that.  

Dual boom tail / pusher combination is rare but not necessarily a bad design. For example, Saab J21 had such layout, and its top speed matched that of Messerschmitt Bf109. Both planes had the same Daimler engine. Saab's cruising speed was considerably slower but on the other hand its max weight was 2000lb more, and range was longer.

In a military application it is also good to have room in front of the cockpit for weaponry. And for agility it is (theoretically) better to have as much of the weight concentrated around the CoG as possible.

Anyway, nice model ARUP,. I had never heard of this type before, Thanks for the education

Minimum wingspan 15 inches, biplanes 12.5 inches, minimum wing area 45 square inches, minimum length 12 inches. Length is measured from the face of the prop drive plate to the rearmost part of the model. Fuselage will be of the profile type, meaning a flat "plank" or "slab".
12" min. I guess Jim could make the call here if he will chime in or PM him , ARUP , If it had a engine in front would be over but I think 12" is 12" getback

I am pretty sure if there is structure surrounding the engine, as in your pusher configuration, LOA will be used instead of having to measure from a specific portion of the engine.  If tip to tail is over 12 inches, then I am sure it is good, assuming that wingspan and area are accounted for.

Phil

I think it qualifies by the rules...the info on measuring assumes a front engine but clearly the over all length must be greater than or equal to 12 inches

It qualifies, it's to cool not to!

Everybody, thanks for the compliments and for chiming in! The G-1 is 16.75" LOA. It's a bit over 45sq" and the span is a smidge over 15". So... it's legal? Don't worry... it won't be the fastest I've ever built. I'm sure it won't be as fast as some seen here, either.

Has anybody ever attached a flex cable drive or universal joint to a Cox engine? That would eliminate some problems for mounting engine in oddball airplanes (though might cause other problems).

ARUP wrote:Everybody, thanks for the compliments and for chiming in! The G-1 is 16.75" LOA. It's a bit over 45sq" and the span is a smidge over 15". So... it's legal?  Don't worry... it won't be the fastest I've ever built. I'm sure it won't be as fast as some seen here, either.

Has anybody ever attached a flex cable drive or universal joint to a Cox engine? That would eliminate some problems for mounting engine in oddball airplanes (though might cause other problems).

There is a mid-engine push/pull twin on Stunthanger that used a shaft extension on .049's in the scale section.  I'll try to find it.

pkrankow wrote:

ARUP wrote:Everybody, thanks for the compliments and for chiming in! The G-1 is 16.75" LOA. It's a bit over 45sq" and the span is a smidge over 15". So... it's legal?  Don't worry... it won't be the fastest I've ever built. I'm sure it won't be as fast as some seen here, either.

Has anybody ever attached a flex cable drive or universal joint to a Cox engine? That would eliminate some problems for mounting engine in oddball airplanes (though might cause other problems).

There is a mid-engine push/pull twin on Stunthanger that used a shaft extension on .049's in the scale section.  I'll try to find it.

This thing is awesome:

http://stunthanger.com/smf/scale-models/do-335/

pkrankow wrote:

ARUP wrote:Everybody, thanks for the compliments and for chiming in! The G-1 is 16.75" LOA. It's a bit over 45sq" and the span is a smidge over 15". So... it's legal?  Don't worry... it won't be the fastest I've ever built. I'm sure it won't be as fast as some seen here, either.

Has anybody ever attached a flex cable drive or universal joint to a Cox engine? That would eliminate some problems for mounting engine in oddball airplanes (though might cause other problems).

There is a mid-engine push/pull twin on Stunthanger that used a shaft extension on .049's in the scale section.  I'll try to find it.

DO335
built by John Rist
http://stunthanger.com/smf/scale-models/24'-do335-per-nats-rules/
http://stunthanger.com/smf/scale-models/do335-12a-profile-twin/
http://stunthanger.com/smf/12-a-building/cox-12a-engine-question/

Apparently the extension causes some added loading so a smaller prop must be used.

Hope this helps.
Phil

Man that's the BOMB !! there was a lot of fun went into that bird lol , there was someone here that was working on one and I think it was in this thread but cant find it 1-50 ... https://www.coxengineforum.com/t5910-cef-speed-contest-design-discussions?highlight=reed+speed+2014 don't know what happen to it don't recall it fling ? / getback

That Do335 is really cool! There are quite a few Goodyear and Formula 1 types that flew in pusher configuration. Having the engine up front would save quite a bit of weight. They still wouldn't be very competitive relative to 'normal' airplanes due to the extension shaft and components, their added friction and weight plus install considerations but... man... they would be cool! Thanks for posting the links!

The G-1 has three coats of 50% thinned nitrate, sanded and ready for white base coat. Hope weather stays nice and unseasonably warm so I can do this tonight!

I did some painting on the P51-D but waited too long to get started and got cooler than I wanted , hope to finish paint today got to sand and redo the fuse that satin nickel/brushed metallic rust stuff I put on was thin and puddled / stuck to my box O well . getback

Bummer about the paint. It happens... right? I did some dopin'! My favorite addiction! The color looks off white but it must be the indoor lighting. It's bright white! I dinged it already bringing it upstairs. Oh well... The '29' is red and the rest of the trim is blue. I need to find some itty bitty 'N' numbers in blue. I might try hand painting 'em!







I like the last pic the best. It's the one where other pilots see it from behind!

Nice job. Looks like it will be nice when completed with all the trim and stuff.

Looking GOOD ! There is also best in show ! Some that won best show never got in the air Yes the dings just seem to pop up when you think damn that looks pretty good and then what the @@@ how did that happen Glad you are coming along with it . getback