Skyward 120 engine selection

[Dougf]

Recently bought one of David's kits, its a beast!

It needs a beam mounted engine, and from what I can see, 30cc 2 stroke gas is the way to go, although I have seen a post on RC Canada that someone put a DLE 20 in one. Would hate to have it under powered, AUW should be about 20lbs. Does anyone know of a good 30cc gas engine that can be beam mounted? The manual recommends 90-108 cu in 2 cycle or 120 cu in 4 cycle on the glow side and forum comments seem to say this is a bit low. Thanks Doug

[Mezri]

Hi Doug, dont be oliged to use beams...the best engines 30cc gaz are not beam monted...most are plot mounted...it is easy to set.

[Dougf]

Thanks Mezri. Unfortunately the model has hardwood engine mount rails which are already part of the structure. I am attaching a couple of pictures. I want to avoid major surgery of cutting off the rails and installing standoffs if at all possible. I may go down to the DLE20 if needed, but prefer to install a 30cc.
Doug

[Sempai-mj]

Do have the mounting template for post mounts.
You might be able to cut the beam section and cowl flush and install the gasser.
20cc too small for your 120 Skywqard.

See the mounting in the picture.

[Dougf]

Do have the mounting template for post mounts.
You might be able to cut the beam section and cowl flush and install the gasser.
20cc too small for your 120 Skywqard.

See the mounting in the picture.

Hi Mike,
I finally smelled the coffee on the DLE20, agree not the best to start off under powered on a new plane. After a bit of research, discovered an NGH35cc 2 stroke with beam mounts and a fairly good reputation. I'm installing it now. I'll post pictures when it looks presentable. Thanks for comments from you and Mezri. Doug

[Sempai-mj]

Cool:cool: Send pics when ready!

[Dougf]

Will do.

As I am sanding down the hard wood beam mounts, I'm wondering what is a good covering to replace the black paint and protect the bare wood. In the "old days" I used clear and colored dope in bottles and a brush to protect balsa and plywood from slimy nitro. Not sure what is used to protect against gas. I use CA in firewall holes, but for larger surfaces? What do you guys use? Thanks

[Dougf]

Z-Poxy finishing resin comes to mind, though it is a clear finish.

[Sempai-mj]

Z-Poxy finishing resin comes to mind, though it is a clear finish.

You can use Epoxy with a bit of Alcohol to thin it.
I used Clear spray on Varathane in the past that seemed to work, a couples of coats.

[Dougf]

Cool:cool: Send pics when ready!

Here are some pics of the installed engine.

[Ian]

Here are some pics of the installed engine.

Nice installation Doug, looks like that engine is an excellent choice for the air frame. And impressive workshop by the way, I can imagine more projects coming out of it. Now, if only you would give your Goldberg Senior Falcon some attention :)

[Dougf]

Nice installation Doug, looks like that engine is an excellent choice for the air frame. And impressive workshop by the way, I can imagine more projects coming out of it. Now, if only you would give your Goldberg Senior Falcon some attention :)

Hi Ian,
I hope to show it some love this winter. Plenty of time at home these days :)

Hope all is well.

Doug

[Dwight Macdonald]

Looking good Doug. I'm sure you will enjoy having lots of power!

[Mezri]

The trainer can handle the extra weight....But keep in mind that you better have light plane than a powerful (havy) plane.
Try to pay attention to the weight when choosing the other accessories...to remain around the recommanded weight.
Have fun.