"SPAD" Simple Plastic Aircraft Design

[Celwin]

I've just finished gluing some plans together. A bit fiddly, but looks good and is somewhat flat...

I didn't realise (because I didn't look) that the model calls for a 20 to 25 size engine. Drats... don't have one of those... My ASP 15 might be a bit on the 'Scale Power Size' and may not have enough vertical grunt to tow a streamer or something. I have an old Enya 19, but it's kind of too precious to use in a disposable model. I'm going to have to try to sneak a new or second-hand one into the PO Box without anyone noticing. Any ideas on how to do that???