150-200cc Extra 300SP

[Terryscustom]

Ouch, bummer! Bolts broke or something?

 

[jamesrxx951]

Yes all 6 of the. Metal spinner backing plate to. I knew I should have rechecked the torque the night before as I try to stay in that habit but got lazy. Never had one come off before. So a mej spinner and 29x12x3 prop is lost forever in the woods. A lot of cost for not doing a periodic torque check on the prop.

 

[jamesrxx951]

Well a lot has happened since the first prop departed. I recieved a new prop and spinner. Torqued it several times. The night before and prior to the first flight. I flew the plane for 5to 6 minutes and landed. Checked prop torque. Actually added 5lbin for heat expansion. 10 minutes into that flight I heard the dreadful noise again. Killed the engine a d dead sticked in. Spinner cone gone and prop was loose with 2 broken bolts. Called Tony at DA because I believe something is wrong wit the engine. The front hub is scorching hot to the touch. Now I'm not happy with loosing $650.00 between 2 props and spinners, and $150.00 for a new cowl. For the time being I bolted up my GP176evo. Flown all day yesterday and most of today without a single issue. I also noticed that the front hub was cool to the touch after each flight. So this confirms to me something is wrong with my new 170. I made a cg change last night more aft. This plane feels really locked in now for me. I'm getting alot of compliments at the club on this plane and how it flys.

 

[Dan767]

Jim, aluminum spinner with aluminum back plate?

 

[jamesrxx951]

Jim, aluminum spinner with aluminum back plate?

Mej spinner was the first one. Aluminum back plate and carbon fiber cone. That spinner was a few years old along with the prop as I used it on my H9 Sukhoi with a different DA170. The second one was a no limits spinner. Aluminum back plate with fiber cone. I know to definitely not use a carbon fiber back plate. That is almost a guaranteed eject-o-prop situation. The one that is on there now with the GP engine is also a No Limits.

 

[Dan767]

I could only guess then as to what would cause the problem. Hope you get it sorted out. Glad that your airplane is okay and the Evo is running good.

 

[grumman-cats]

Here's a couple of pics of what I've done to the tail of my extra and also part of the new color scheme. Yes it was a beautiful model as is but I just had to add some of my own touches to it. I also have most of the fuselage ready, I just need to finish the wings.

 

[grumman-cats]

here it is on it's gear, I also made a quick release hatch instead of bolting it down everyday. I did this to my 50cc edge and it worked really well. Hoping the same here.

 

[grumman-cats]

Here's the wingtip and what I'm building there. Just adding some small scale touches to the wings.

 

[Islandflyer]

Thank you for sharing the photos.
I am not sure how much flight characteristics these mods might change, but it will no longer be a 300SP: the SP has no counterbalance on elevators or ailerons.