I'm building this model from a plan that I've reduced to 1:16 with a wingspan of 57cm
The engine that I'm going to use is a GM120.
Is there someone who can give an advice about the up and site trust?
Welcome Andre, I like the DH2 and it is definately in my future plans. I hope that the "sparkie " will be powerfull enough for a decent flight... :)
Hi Andre,
looking very nice and quite interesting.
Regarding thrustlines on a pusher, have a look at this:
https://hpa.aeromodelling.gr/index.php?topic=159.0
Thanks Georg,
The thread is very helpful.
The interesting thing about this subject is that every side-view or pictures of a fullsize airplane I've ever seen shows a massive amount of downthrust on a pusher engine (which is actually upthrust when converted to a tractor engine in the same position). But every model built shown so far has a perfectly straight engine, either originally or after trimming flights. Anyone understand this?
I suspect that the drag of the fuselage is proportionally much higher at the lower flying speed of the models, moving the centre of drag closer to the thrust line.
John
Tryout if everything is lined up correctly.
The struts are connected with small pieces of PLA that I've drawn in SolidWorks and printed.IMG_20260202_204056_HDR.jpg
Reply to stunthenk (are we unable to reply to individual messages?)
I built a diesel FF FE8 and it specified, and needed, no offsets at all. Reminds me of my 0/400 with tractor engines also close to CG which also needed none.
One size fits all 8)
GM120
Wings covered tissue and only sprayed with water.
Printed a few parts with one layer and 5% infil.
Still a lot to be done, but.....
Nice work, well done!
The last parts are drying after a treatment with dope and the last step is to paint them in the right color.
Hi Andre,
looks very nice! You could not settle for a simplier model?
George
Very nice. I particularly like the printed engine. Can you tell me how much it weighs so far?
You have a real aircraft factory Andre - turning out precision replicas :)
John
Quote from: Piecost on Apr 09, 2026, 12:08 AMVery nice. I particularly like the printed engine. Can you tell me how much it weighs so far?
Model weights until now in this state with Horizontal and ruder 104 gram.
Wing loading 9,21 gram/dm²
Nice Andre, I hope to see it in Nijmegen next November
Very Nice!
Quote from: nickhawk on Apr 10, 2026, 11:35 PMNice Andre, I hope to see it in Nijmegen next November
Hi Nikos,
it was a pleasure meeting you in Wijchen last year and I look forward to meeting you again in November of this year.
Awesome build Andre. Following with great interest.
Skyraider