The 85 just looks the right size for perfect flying fun.

Front bulkhead and new firewall template done.
Calculated the engine offset to be 11mm at bulkhead level. Tomorrow is another day.

Originally Posted by pe reivers

The 85 just looks the right size for perfect flying fun.

Front bulkhead and new firewall template done.
Calculated the engine offset to be 11mm at bulkhead level. Tomorrow is another day.

I am afraid if it will be strong enough. pls check the attachment.

You are right. I plan to make aluminum angle like in the original firewall mounting, angled outward, screwed and epoxied into place to form a base for the new firewall. I will post a picture as soon as I have it in place.
This is the first setup. Also included is a lower crossbrace to use as much of the engine box as possible. Insert nuts must be added first before I can finalize the reinforcement.
1) mockup
2) halfway
3) glued in and secured
4) intermediate (adjustable) firewall installed (6-ply birch), intended to break before the plane does.

Great work on the Builds guys!!!! The fire walls are looking good. Get these done so you can enjoy them like i am! Heres a little video for some building modivation. Man they are a blast to fly!!!!

Petes Big A$$ Decathlon (5 min 34 sec)

What a beast! It flies like a foamy.
Question: with flaps, how much elevator correction is needed?

Originally Posted by pe reivers

What a beast! It flies like a foamy.
Question: with flaps, how much elevator correction is needed?

With flaps full down i have 4 points of down elevator. I could probably get away with 3 but i like to have to pull back slightly on the sticks when landing and also this helps with when i get it on the ground that its doesn't tend to bounce as much, helping stick it to the ground. It flys just like an 80 lbs foamie!!!! What a blast! It flys very light!

Thanks Fijibubba, The down trim could hardly be seen in the video.

Some more work done:
Fitted the auxiliary fire wall
fitted (preliminary) stand-offs
fitted firewall
test fitted the engine. When the prop was flipped, there was a "solid feel" I am confident this combo will work out OK.
The right cylinder is within the cowl, the left cylinder head fins stick out.
I mounted the engine a wee little bit lower than I should, so all parts will clear the cowl. Later, the cowl will need to be angled down slightly to compensate.

that plane screams "gimmie a da120" F the cowl !
looking good

Oh no! Duck! D*A* freak in sight!

For the time being I leave the motor install. The final adjustments will be made when the tow hook structure is finished.
In order to transfer the forces from engine to tow structure, two piano wires will be used that will run from engine box to the rear wing tube. The greenhouse top will be reinforced to distribute the forces, and allow for a cross plate structure with servo and tow hook right behind the top hatch.

Originally Posted by pe reivers

For the time being I leave the motor install. The final adjustments will be made when the tow hook structure is finished.
In order to transfer the forces from engine to tow structure, two piano wires will be used that will run from engine box to the rear wing tube. The greenhouse top will be reinforced to distribute the forces, and allow for a cross plate structure with servo and tow hook right behind the top hatch.

Good idea on the wire bracing, the full scale Scout that we used to pull 2 seat shweitzer gliders was reinforced.

Originally Posted by pe reivers

Oh no! Duck! D*A* freak in sight!

wich way did he go ?

Originally Posted by airboss/oc

wich way did he go ?

Last year you were a 3W Freak? And now you're a Devoted DA Advocate... You must have seen the Light after all the Dead-Sticks Just stop after you made the Switch? A lot to be said for a little less Compression and Performance as a trade off for Awesome Reliability?

Originally Posted by Efishensea

Last year you were a 3W Freak? And now you're a Devoted DA Advocate... You must have seen the Light after all the Dead-Sticks Just stop after you made the Switch? A lot to be said for a little less Compression and Performance as a trade off for Awesome Reliability?

deadsticks are F'd up ! my 3W ran like nothing out there till the 120 came along but those 3W ignitions can be a pain. I learned the DA is best for the general public but the 3W is still one very powerfull engine.

Tow Release, Carb Tune Tube & CF Supports.